Auto merge of #74662 - Manishearth:rollup-jdt7t71, r=Manishearth

Rollup of 9 pull requests

Successful merges:

 - #73783 (Detect when `'static` obligation might come from an `impl`)
 - #73868 (Advertise correct stable version for const control flow)
 - #74460 (rustdoc: Always warn when linking from public to private items)
 - #74538 (Guard against non-monomorphized type_id intrinsic call)
 - #74541 (Add the aarch64-apple-darwin target )
 - #74600 (Enable perf try builder)
 - #74618 (Do not ICE on assoc type with bad placeholder)
 - #74631 (rustc_target: Add a target spec option for disabling `--eh-frame-hdr`)
 - #74643 (build: Remove unnecessary `cargo:rerun-if-env-changed` annotations)

Failed merges:

r? @ghost

.github/workflows/ci.yml

@@ -20,6 +20,7 @@ name: CI
     branches:
       - auto
       - try
+      - try-perf
       - master
   pull_request:
     branches:
@@ -146,7 +147,7 @@ jobs:
       CACHES_AWS_ACCESS_KEY_ID: AKIA46X5W6CZI5DHEBFL
       ARTIFACTS_AWS_ACCESS_KEY_ID: AKIA46X5W6CZN24CBO55
       CACHE_DOMAIN: ci-caches.rust-lang.org
-    if: "github.event_name == 'push' && github.ref == 'refs/heads/try' && github.repository == 'rust-lang-ci/rust'"
+    if: "github.event_name == 'push' && (github.ref == 'refs/heads/try' || github.ref == 'refs/heads/try-perf') && github.repository == 'rust-lang-ci/rust'"
     strategy:
       matrix:
         include:
@@ -717,7 +718,7 @@ jobs:
   try-success:
     needs:
       - try
-    if: "success() && github.event_name == 'push' && github.ref == 'refs/heads/try' && github.repository == 'rust-lang-ci/rust'"
+    if: "success() && github.event_name == 'push' && (github.ref == 'refs/heads/try' || github.ref == 'refs/heads/try-perf') && github.repository == 'rust-lang-ci/rust'"
     steps:
       - name: mark the job as a success
         run: exit 0
@@ -727,7 +728,7 @@ jobs:
   try-failure:
     needs:
       - try
-    if: "!success() && github.event_name == 'push' && github.ref == 'refs/heads/try' && github.repository == 'rust-lang-ci/rust'"
+    if: "!success() && github.event_name == 'push' && (github.ref == 'refs/heads/try' || github.ref == 'refs/heads/try-perf') && github.repository == 'rust-lang-ci/rust'"
     steps:
       - name: mark the job as a failure
         run: exit 1

Cargo.lock

@@ -412,9 +412,9 @@ version = "0.1.0"
 
 [[package]]
 name = "cc"
-version = "1.0.57"
+version = "1.0.58"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0fde55d2a2bfaa4c9668bbc63f531fbdeee3ffe188f4662511ce2c22b3eedebe"
+checksum = "f9a06fb2e53271d7c279ec1efea6ab691c35a2ae67ec0d91d7acec0caf13b518"
 dependencies = [
  "jobserver",
 ]
@@ -1576,9 +1576,9 @@ checksum = "b294d6fa9ee409a054354afc4352b0b9ef7ca222c69b8812cbea9e7d2bf3783f"
 
 [[package]]
 name = "libc"
-version = "0.2.71"
+version = "0.2.73"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9457b06509d27052635f90d6466700c65095fdf75409b3fbdd903e988b886f49"
+checksum = "bd7d4bd64732af4bf3a67f367c27df8520ad7e230c5817b8ff485864d80242b9"
 dependencies = [
  "rustc-std-workspace-core",
 ]

src/build_helper/lib.rs

@@ -1,3 +1,5 @@
+use std::ffi::{OsStr, OsString};
+use std::fmt::Display;
 use std::path::{Path, PathBuf};
 use std::process::{Command, Stdio};
 use std::time::{SystemTime, UNIX_EPOCH};
@@ -28,6 +30,14 @@ macro_rules! t {
     };
 }
 
+/// Reads an environment variable and adds it to dependencies.
+/// Supposed to be used for all variables except those set for build scripts by cargo
+/// https://doc.rust-lang.org/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts
+pub fn tracked_env_var_os<K: AsRef<OsStr> + Display>(key: K) -> Option<OsString> {
+    println!("cargo:rerun-if-env-changed={}", key);
+    env::var_os(key)
+}
+
 // Because Cargo adds the compiler's dylib path to our library search path, llvm-config may
 // break: the dylib path for the compiler, as of this writing, contains a copy of the LLVM
 // shared library, which means that when our freshly built llvm-config goes to load it's
@@ -37,10 +47,8 @@ macro_rules! t {
 // perfect -- we might actually want to see something from Cargo's added library paths -- but
 // for now it works.
 pub fn restore_library_path() {
-    println!("cargo:rerun-if-env-changed=REAL_LIBRARY_PATH_VAR");
-    println!("cargo:rerun-if-env-changed=REAL_LIBRARY_PATH");
-    let key = env::var_os("REAL_LIBRARY_PATH_VAR").expect("REAL_LIBRARY_PATH_VAR");
-    if let Some(env) = env::var_os("REAL_LIBRARY_PATH") {
+    let key = tracked_env_var_os("REAL_LIBRARY_PATH_VAR").expect("REAL_LIBRARY_PATH_VAR");
+    if let Some(env) = tracked_env_var_os("REAL_LIBRARY_PATH") {
         env::set_var(&key, &env);
     } else {
         env::remove_var(&key);

src/ci/github-actions/ci.yml

@@ -247,6 +247,7 @@ on:
     branches:
       - auto
       - try
+      - try-perf
       - master
   pull_request:
     branches:
@@ -285,7 +286,7 @@ jobs:
     name: try
     env:
       <<: [*shared-ci-variables, *prod-variables]
-    if: github.event_name == 'push' && github.ref == 'refs/heads/try' && github.repository == 'rust-lang-ci/rust'
+    if: github.event_name == 'push' && (github.ref == 'refs/heads/try' || github.ref == 'refs/heads/try-perf') && github.repository == 'rust-lang-ci/rust'
     strategy:
       matrix:
         include:
@@ -645,11 +646,11 @@ jobs:
   # successful listening to webhooks only.
   try-success:
     needs: [try]
-    if: "success() && github.event_name == 'push' && github.ref == 'refs/heads/try' && github.repository == 'rust-lang-ci/rust'"
+    if: "success() && github.event_name == 'push' && (github.ref == 'refs/heads/try' || github.ref == 'refs/heads/try-perf') && github.repository == 'rust-lang-ci/rust'"
     <<: *base-success-job
   try-failure:
     needs: [try]
-    if: "!success() && github.event_name == 'push' && github.ref == 'refs/heads/try' && github.repository == 'rust-lang-ci/rust'"
+    if: "!success() && github.event_name == 'push' && (github.ref == 'refs/heads/try' || github.ref == 'refs/heads/try-perf') && github.repository == 'rust-lang-ci/rust'"
     <<: *base-failure-job
   auto-success:
     needs: [auto]

src/libprofiler_builtins/Cargo.toml

@@ -1,6 +1,5 @@
 [package]
 authors = ["The Rust Project Developers"]
-build = "build.rs"
 name = "profiler_builtins"
 version = "0.0.0"
 edition = "2018"

src/libprofiler_builtins/build.rs

@@ -9,6 +9,8 @@ fn main() {
     let target = env::var("TARGET").expect("TARGET was not set");
     let cfg = &mut cc::Build::new();
 
+    // FIXME: `rerun-if-changed` directives are not currently emitted and the build script
+    // will not rerun on changes in these source files or headers included into them.
     let mut profile_sources = vec![
         "GCDAProfiling.c",
         "InstrProfiling.c",

src/librustc_ast/build.rs

@@ -1,5 +0,0 @@
-fn main() {
-    println!("cargo:rerun-if-changed=build.rs");
-    println!("cargo:rerun-if-env-changed=CFG_RELEASE_CHANNEL");
-    println!("cargo:rerun-if-env-changed=CFG_DISABLE_UNSTABLE_FEATURES");
-}

src/librustc_attr/Cargo.toml

@@ -3,7 +3,6 @@ authors = ["The Rust Project Developers"]
 name = "rustc_attr"
 version = "0.0.0"
 edition = "2018"
-build = "build.rs"
 
 [lib]
 name = "rustc_attr"

src/librustc_attr/build.rs

@@ -1,5 +0,0 @@
-fn main() {
-    println!("cargo:rerun-if-changed=build.rs");
-    println!("cargo:rerun-if-env-changed=CFG_RELEASE");
-    println!("cargo:rerun-if-env-changed=CFG_RELEASE_CHANNEL");
-}

src/librustc_codegen_llvm/build.rs

@@ -1,6 +0,0 @@
-fn main() {
-    println!("cargo:rerun-if-changed=build.rs");
-    println!("cargo:rerun-if-env-changed=CFG_VERSION");
-    println!("cargo:rerun-if-env-changed=CFG_PREFIX");
-    println!("cargo:rerun-if-env-changed=CFG_LLVM_ROOT");
-}

src/librustc_codegen_ssa/back/link.rs

@@ -1598,7 +1598,9 @@ fn linker_with_args<'a, B: ArchiveBuilder<'a>>(
     }
 
     // NO-OPT-OUT, OBJECT-FILES-NO, AUDIT-ORDER
-    cmd.add_eh_frame_header();
+    if sess.target.target.options.eh_frame_header {
+        cmd.add_eh_frame_header();
+    }
 
     // NO-OPT-OUT, OBJECT-FILES-NO
     if crt_objects_fallback {

src/librustc_codegen_ssa/back/linker.rs

@@ -619,13 +619,7 @@ impl<'a> Linker for GccLinker<'a> {
     // Some versions of `gcc` add it implicitly, some (e.g. `musl-gcc`) don't,
     // so we just always add it.
     fn add_eh_frame_header(&mut self) {
-        if !self.sess.target.target.options.is_like_osx
-            && !self.sess.target.target.options.is_like_windows
-            && !self.sess.target.target.options.is_like_solaris
-            && self.sess.target.target.target_os != "uefi"
-        {
-            self.linker_arg("--eh-frame-hdr");
-        }
+        self.linker_arg("--eh-frame-hdr");
     }
 }
 

src/librustc_codegen_ssa/build.rs

@@ -1,4 +0,0 @@
-fn main() {
-    println!("cargo:rerun-if-changed=build.rs");
-    println!("cargo:rerun-if-env-changed=CFG_RELEASE_CHANNEL");
-}

src/librustc_driver/build.rs

@@ -1,7 +0,0 @@
-fn main() {
-    println!("cargo:rerun-if-changed=build.rs");
-    println!("cargo:rerun-if-env-changed=CFG_RELEASE");
-    println!("cargo:rerun-if-env-changed=CFG_VERSION");
-    println!("cargo:rerun-if-env-changed=CFG_VER_DATE");
-    println!("cargo:rerun-if-env-changed=CFG_VER_HASH");
-}

src/librustc_error_codes/error_codes.rs

@@ -633,4 +633,5 @@ E0771: include_str!("./error_codes/E0771.md"),
     E0755, // `#[ffi_pure]` is only allowed on foreign functions
     E0756, // `#[ffi_const]` is only allowed on foreign functions
     E0757, // `#[ffi_const]` functions cannot be `#[ffi_pure]`
+    E0772, // `'static' obligation coming from `impl dyn Trait {}` or `impl Foo for dyn Bar {}`.
 }

src/librustc_feature/accepted.rs

@@ -262,9 +262,9 @@ declare_features! (
     /// Allows using subslice patterns, `[a, .., b]` and `[a, xs @ .., b]`.
     (accepted, slice_patterns, "1.42.0", Some(62254), None),
     /// Allows the use of `if` and `match` in constants.
-    (accepted, const_if_match, "1.45.0", Some(49146), None),
+    (accepted, const_if_match, "1.46.0", Some(49146), None),
     /// Allows the use of `loop` and `while` in constants.
-    (accepted, const_loop, "1.45.0", Some(52000), None),
+    (accepted, const_loop, "1.46.0", Some(52000), None),
     /// Allows `#[track_caller]` to be used which provides
     /// accurate caller location reporting during panic (RFC 2091).
     (accepted, track_caller, "1.46.0", Some(47809), None),

src/librustc_hir/hir.rs

@@ -2198,7 +2198,17 @@ pub enum IsAsync {
     NotAsync,
 }
 
-#[derive(Copy, Clone, PartialEq, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)]
+#[derive(
+    Copy,
+    Clone,
+    PartialEq,
+    RustcEncodable,
+    RustcDecodable,
+    Debug,
+    HashStable_Generic,
+    Eq,
+    Hash
+)]
 pub enum Defaultness {
     Default { has_value: bool },
     Final,

src/librustc_incremental/build.rs

@@ -1,4 +0,0 @@
-fn main() {
-    println!("cargo:rerun-if-changed=build.rs");
-    println!("cargo:rerun-if-env-changed=CFG_VERSION");
-}

src/librustc_infer/infer/combine.rs

@@ -36,12 +36,13 @@ use crate::traits::{Obligation, PredicateObligations};
 
 use rustc_ast::ast;
 use rustc_hir::def_id::DefId;
+use rustc_middle::traits::ObligationCause;
 use rustc_middle::ty::error::TypeError;
 use rustc_middle::ty::relate::{self, Relate, RelateResult, TypeRelation};
 use rustc_middle::ty::subst::SubstsRef;
 use rustc_middle::ty::{self, InferConst, ToPredicate, Ty, TyCtxt, TypeFoldable};
 use rustc_middle::ty::{IntType, UintType};
-use rustc_span::{Span, DUMMY_SP};
+use rustc_span::DUMMY_SP;
 
 #[derive(Clone)]
 pub struct CombineFields<'infcx, 'tcx> {
@@ -367,10 +368,11 @@ impl<'infcx, 'tcx> CombineFields<'infcx, 'tcx> {
         };
 
         debug!("generalize: for_universe = {:?}", for_universe);
+        debug!("generalize: trace = {:?}", self.trace);
 
         let mut generalize = Generalizer {
             infcx: self.infcx,
-            span: self.trace.cause.span,
+            cause: &self.trace.cause,
             for_vid_sub_root: self.infcx.inner.borrow_mut().type_variables().sub_root_var(for_vid),
             for_universe,
             ambient_variance,
@@ -414,7 +416,7 @@ struct Generalizer<'cx, 'tcx> {
     infcx: &'cx InferCtxt<'cx, 'tcx>,
 
     /// The span, used when creating new type variables and things.
-    span: Span,
+    cause: &'cx ObligationCause<'tcx>,
 
     /// The vid of the type variable that is in the process of being
     /// instantiated; if we find this within the type we are folding,
@@ -639,7 +641,7 @@ impl TypeRelation<'tcx> for Generalizer<'_, 'tcx> {
 
         // FIXME: This is non-ideal because we don't give a
         // very descriptive origin for this region variable.
-        Ok(self.infcx.next_region_var_in_universe(MiscVariable(self.span), self.for_universe))
+        Ok(self.infcx.next_region_var_in_universe(MiscVariable(self.cause.span), self.for_universe))
     }
 
     fn consts(

src/librustc_infer/infer/error_reporting/mod.rs

@@ -2010,7 +2010,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
             infer::MiscVariable(_) => String::new(),
             infer::PatternRegion(_) => " for pattern".to_string(),
             infer::AddrOfRegion(_) => " for borrow expression".to_string(),
-            infer::Autoref(_) => " for autoref".to_string(),
+            infer::Autoref(_, _) => " for autoref".to_string(),
             infer::Coercion(_) => " for automatic coercion".to_string(),
             infer::LateBoundRegion(_, br, infer::FnCall) => {
                 format!(" for lifetime parameter {}in function call", br_string(br))

src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs

@@ -2,227 +2,504 @@
 
 use crate::infer::error_reporting::nice_region_error::NiceRegionError;
 use crate::infer::lexical_region_resolve::RegionResolutionError;
-use rustc_errors::{struct_span_err, Applicability, ErrorReported};
-use rustc_hir::{GenericBound, ItemKind, Lifetime, LifetimeName, TyKind};
-use rustc_middle::ty::RegionKind;
+use crate::infer::{SubregionOrigin, TypeTrace};
+use crate::traits::{ObligationCauseCode, UnifyReceiverContext};
+use rustc_errors::{struct_span_err, Applicability, DiagnosticBuilder, ErrorReported};
+use rustc_hir::def_id::DefId;
+use rustc_hir::intravisit::{walk_ty, ErasedMap, NestedVisitorMap, Visitor};
+use rustc_hir::{
+    self as hir, GenericBound, ImplItem, Item, ItemKind, Lifetime, LifetimeName, Node, TraitItem,
+    TyKind,
+};
+use rustc_middle::ty::{self, AssocItemContainer, RegionKind, Ty, TypeFoldable, TypeVisitor};
+use rustc_span::symbol::Ident;
+use rustc_span::{MultiSpan, Span};
 
 impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
-    /// Print the error message for lifetime errors when the return type is a static impl Trait.
+    /// Print the error message for lifetime errors when the return type is a static `impl Trait`,
+    /// `dyn Trait` or if a method call on a trait object introduces a static requirement.
     pub(super) fn try_report_static_impl_trait(&self) -> Option<ErrorReported> {
         debug!("try_report_static_impl_trait(error={:?})", self.error);
-        if let Some(RegionResolutionError::SubSupConflict(
-            _,
-            var_origin,
-            ref sub_origin,
-            sub_r,
-            ref sup_origin,
-            sup_r,
-        )) = self.error
-        {
-            debug!(
-                "try_report_static_impl_trait(var={:?}, sub={:?} {:?} sup={:?} {:?})",
-                var_origin, sub_origin, sub_r, sup_origin, sup_r
-            );
-            let anon_reg_sup = self.tcx().is_suitable_region(sup_r)?;
-            debug!("try_report_static_impl_trait: anon_reg_sup={:?}", anon_reg_sup);
-            let fn_returns = self.tcx().return_type_impl_or_dyn_traits(anon_reg_sup.def_id);
-            if fn_returns.is_empty() {
+        let tcx = self.tcx();
+        let (var_origin, sub_origin, sub_r, sup_origin, sup_r) = match self.error.as_ref()? {
+            RegionResolutionError::SubSupConflict(
+                _,
+                var_origin,
+                sub_origin,
+                sub_r,
+                sup_origin,
+                sup_r,
+            ) if **sub_r == RegionKind::ReStatic => {
+                (var_origin, sub_origin, sub_r, sup_origin, sup_r)
+            }
+            RegionResolutionError::ConcreteFailure(
+                SubregionOrigin::Subtype(box TypeTrace { cause, .. }),
+                sub_r,
+                sup_r,
+            ) if **sub_r == RegionKind::ReStatic => {
+                // This is for an implicit `'static` requirement coming from `impl dyn Trait {}`.
+                if let ObligationCauseCode::UnifyReceiver(ctxt) = &cause.code {
+                    let param = self.find_param_with_region(sup_r, sub_r)?;
+                    let lifetime = if sup_r.has_name() {
+                        format!("lifetime `{}`", sup_r)
+                    } else {
+                        "an anonymous lifetime `'_`".to_string()
+                    };
+                    let mut err = struct_span_err!(
+                        tcx.sess,
+                        cause.span,
+                        E0772,
+                        "{} has {} but calling `{}` introduces an implicit `'static` lifetime \
+                         requirement",
+                        param
+                            .param
+                            .pat
+                            .simple_ident()
+                            .map(|s| format!("`{}`", s))
+                            .unwrap_or_else(|| "`fn` parameter".to_string()),
+                        lifetime,
+                        ctxt.assoc_item.ident,
+                    );
+                    err.span_label(param.param_ty_span, &format!("this data with {}...", lifetime));
+                    err.span_label(
+                        cause.span,
+                        &format!(
+                            "...is captured and required to live as long as `'static` here \
+                             because of an implicit lifetime bound on the {}",
+                            match ctxt.assoc_item.container {
+                                AssocItemContainer::TraitContainer(id) =>
+                                    format!("`impl` of `{}`", tcx.def_path_str(id)),
+                                AssocItemContainer::ImplContainer(_) =>
+                                    "inherent `impl`".to_string(),
+                            },
+                        ),
+                    );
+                    if self.find_impl_on_dyn_trait(&mut err, param.param_ty, &ctxt) {
+                        err.emit();
+                        return Some(ErrorReported);
+                    } else {
+                        err.cancel();
+                    }
+                }
                 return None;
             }
-            debug!("try_report_static_impl_trait: fn_return={:?}", fn_returns);
-            if *sub_r == RegionKind::ReStatic {
-                let sp = var_origin.span();
-                let return_sp = sub_origin.span();
-                let param_info = self.find_param_with_region(sup_r, sub_r)?;
-                let (lifetime_name, lifetime) = if sup_r.has_name() {
-                    (sup_r.to_string(), format!("lifetime `{}`", sup_r))
-                } else {
-                    ("'_".to_owned(), "an anonymous lifetime `'_`".to_string())
-                };
-                let mut err = struct_span_err!(
-                    self.tcx().sess,
-                    sp,
-                    E0759,
-                    "cannot infer an appropriate lifetime"
-                );
+            _ => return None,
+        };
+        debug!(
+            "try_report_static_impl_trait(var={:?}, sub={:?} {:?} sup={:?} {:?})",
+            var_origin, sub_origin, sub_r, sup_origin, sup_r
+        );
+        let anon_reg_sup = tcx.is_suitable_region(sup_r)?;
+        debug!("try_report_static_impl_trait: anon_reg_sup={:?}", anon_reg_sup);
+        let sp = var_origin.span();
+        let return_sp = sub_origin.span();
+        let param = self.find_param_with_region(sup_r, sub_r)?;
+        let (lifetime_name, lifetime) = if sup_r.has_name() {
+            (sup_r.to_string(), format!("lifetime `{}`", sup_r))
+        } else {
+            ("'_".to_owned(), "an anonymous lifetime `'_`".to_string())
+        };
+        let param_name = param
+            .param
+            .pat
+            .simple_ident()
+            .map(|s| format!("`{}`", s))
+            .unwrap_or_else(|| "`fn` parameter".to_string());
+        let mut err = struct_span_err!(
+            tcx.sess,
+            sp,
+            E0759,
+            "{} has {} but it needs to satisfy a `'static` lifetime requirement",
+            param_name,
+            lifetime,
+        );
+        err.span_label(param.param_ty_span, &format!("this data with {}...", lifetime));
+        debug!("try_report_static_impl_trait: param_info={:?}", param);
+
+        // We try to make the output have fewer overlapping spans if possible.
+        if (sp == sup_origin.span() || !return_sp.overlaps(sup_origin.span()))
+            && sup_origin.span() != return_sp
+        {
+            // FIXME: account for `async fn` like in `async-await/issues/issue-62097.rs`
+
+            // Customize the spans and labels depending on their relative order so
+            // that split sentences flow correctly.
+            if sup_origin.span().overlaps(return_sp) && sp == sup_origin.span() {
+                // Avoid the following:
+                //
+                // error: cannot infer an appropriate lifetime
+                //   --> $DIR/must_outlive_least_region_or_bound.rs:18:50
+                //    |
+                // LL | fn foo(x: &i32) -> Box<dyn Debug> { Box::new(x) }
+                //    |           ----                      ---------^-
+                //
+                // and instead show:
+                //
+                // error: cannot infer an appropriate lifetime
+                //   --> $DIR/must_outlive_least_region_or_bound.rs:18:50
+                //    |
+                // LL | fn foo(x: &i32) -> Box<dyn Debug> { Box::new(x) }
+                //    |           ----                               ^
                 err.span_label(
-                    param_info.param_ty_span,
-                    &format!("this data with {}...", lifetime),
+                    sup_origin.span(),
+                    "...is captured here, requiring it to live as long as `'static`",
                 );
-                debug!("try_report_static_impl_trait: param_info={:?}", param_info);
-
-                // We try to make the output have fewer overlapping spans if possible.
-                if (sp == sup_origin.span() || !return_sp.overlaps(sup_origin.span()))
-                    && sup_origin.span() != return_sp
-                {
-                    // FIXME: account for `async fn` like in `async-await/issues/issue-62097.rs`
-
-                    // Customize the spans and labels depending on their relative order so
-                    // that split sentences flow correctly.
-                    if sup_origin.span().overlaps(return_sp) && sp == sup_origin.span() {
-                        // Avoid the following:
-                        //
-                        // error: cannot infer an appropriate lifetime
-                        //   --> $DIR/must_outlive_least_region_or_bound.rs:18:50
-                        //    |
-                        // LL | fn foo(x: &i32) -> Box<dyn Debug> { Box::new(x) }
-                        //    |           ----                      ---------^-
-                        //
-                        // and instead show:
-                        //
-                        // error: cannot infer an appropriate lifetime
-                        //   --> $DIR/must_outlive_least_region_or_bound.rs:18:50
-                        //    |
-                        // LL | fn foo(x: &i32) -> Box<dyn Debug> { Box::new(x) }
-                        //    |           ----                               ^
-                        err.span_label(
-                            sup_origin.span(),
-                            "...is captured here, requiring it to live as long as `'static`",
-                        );
-                    } else {
-                        err.span_label(sup_origin.span(), "...is captured here...");
-                        if return_sp < sup_origin.span() {
-                            err.span_note(
-                                return_sp,
-                                "...and is required to live as long as `'static` here",
-                            );
-                        } else {
-                            err.span_label(
-                                return_sp,
-                                "...and is required to live as long as `'static` here",
-                            );
-                        }
-                    }
+            } else {
+                err.span_label(sup_origin.span(), "...is captured here...");
+                if return_sp < sup_origin.span() {
+                    err.span_note(
+                        return_sp,
+                        "...and is required to live as long as `'static` here",
+                    );
                 } else {
                     err.span_label(
                         return_sp,
-                        "...is captured and required to live as long as `'static` here",
+                        "...and is required to live as long as `'static` here",
                     );
                 }
+            }
+        } else {
+            err.span_label(
+                return_sp,
+                "...is captured and required to live as long as `'static` here",
+            );
+        }
 
-                // FIXME: account for the need of parens in `&(dyn Trait + '_)`
-                let consider = "consider changing the";
-                let declare = "to declare that the";
-                let arg = match param_info.param.pat.simple_ident() {
-                    Some(simple_ident) => format!("argument `{}`", simple_ident),
-                    None => "the argument".to_string(),
-                };
-                let explicit =
-                    format!("you can add an explicit `{}` lifetime bound", lifetime_name);
-                let explicit_static =
-                    format!("explicit `'static` bound to the lifetime of {}", arg);
-                let captures = format!("captures data from {}", arg);
-                let add_static_bound =
-                    "alternatively, add an explicit `'static` bound to this reference";
-                let plus_lt = format!(" + {}", lifetime_name);
-                for fn_return in fn_returns {
-                    if fn_return.span.desugaring_kind().is_some() {
-                        // Skip `async` desugaring `impl Future`.
-                        continue;
-                    }
-                    match fn_return.kind {
-                        TyKind::OpaqueDef(item_id, _) => {
-                            let item = self.tcx().hir().item(item_id.id);
-                            let opaque = if let ItemKind::OpaqueTy(opaque) = &item.kind {
-                                opaque
-                            } else {
-                                err.emit();
-                                return Some(ErrorReported);
-                            };
+        let fn_returns = tcx.return_type_impl_or_dyn_traits(anon_reg_sup.def_id);
 
-                            if let Some(span) = opaque
-                                .bounds
-                                .iter()
-                                .filter_map(|arg| match arg {
-                                    GenericBound::Outlives(Lifetime {
-                                        name: LifetimeName::Static,
-                                        span,
-                                        ..
-                                    }) => Some(*span),
-                                    _ => None,
-                                })
-                                .next()
-                            {
-                                err.span_suggestion_verbose(
-                                    span,
-                                    &format!("{} `impl Trait`'s {}", consider, explicit_static),
-                                    lifetime_name.clone(),
-                                    Applicability::MaybeIncorrect,
-                                );
-                                err.span_suggestion_verbose(
-                                    param_info.param_ty_span,
-                                    add_static_bound,
-                                    param_info.param_ty.to_string(),
-                                    Applicability::MaybeIncorrect,
-                                );
-                            } else if let Some(_) = opaque
-                                .bounds
-                                .iter()
-                                .filter_map(|arg| match arg {
-                                    GenericBound::Outlives(Lifetime { name, span, .. })
-                                        if name.ident().to_string() == lifetime_name =>
-                                    {
-                                        Some(*span)
-                                    }
-                                    _ => None,
-                                })
-                                .next()
-                            {
-                            } else {
-                                err.span_suggestion_verbose(
-                                    fn_return.span.shrink_to_hi(),
-                                    &format!(
-                                        "{declare} `impl Trait` {captures}, {explicit}",
-                                        declare = declare,
-                                        captures = captures,
-                                        explicit = explicit,
-                                    ),
-                                    plus_lt.clone(),
-                                    Applicability::MaybeIncorrect,
-                                );
-                            }
-                        }
-                        TyKind::TraitObject(_, lt) => match lt.name {
-                            LifetimeName::ImplicitObjectLifetimeDefault => {
-                                err.span_suggestion_verbose(
-                                    fn_return.span.shrink_to_hi(),
-                                    &format!(
-                                        "{declare} trait object {captures}, {explicit}",
-                                        declare = declare,
-                                        captures = captures,
-                                        explicit = explicit,
-                                    ),
-                                    plus_lt.clone(),
-                                    Applicability::MaybeIncorrect,
-                                );
-                            }
-                            name if name.ident().to_string() != lifetime_name => {
-                                // With this check we avoid suggesting redundant bounds. This
-                                // would happen if there are nested impl/dyn traits and only
-                                // one of them has the bound we'd suggest already there, like
-                                // in `impl Foo<X = dyn Bar> + '_`.
-                                err.span_suggestion_verbose(
-                                    lt.span,
-                                    &format!("{} trait object's {}", consider, explicit_static),
-                                    lifetime_name.clone(),
-                                    Applicability::MaybeIncorrect,
-                                );
-                                err.span_suggestion_verbose(
-                                    param_info.param_ty_span,
-                                    add_static_bound,
-                                    param_info.param_ty.to_string(),
-                                    Applicability::MaybeIncorrect,
-                                );
-                            }
-                            _ => {}
-                        },
-                        _ => {}
-                    }
+        let mut override_error_code = None;
+        if let SubregionOrigin::Subtype(box TypeTrace { cause, .. }) = &sup_origin {
+            if let ObligationCauseCode::UnifyReceiver(ctxt) = &cause.code {
+                // Handle case of `impl Foo for dyn Bar { fn qux(&self) {} }` introducing a
+                // `'static` lifetime when called as a method on a binding: `bar.qux()`.
+                if self.find_impl_on_dyn_trait(&mut err, param.param_ty, &ctxt) {
+                    override_error_code = Some(ctxt.assoc_item.ident);
                 }
-                err.emit();
-                return Some(ErrorReported);
             }
         }
-        None
+        if let SubregionOrigin::Subtype(box TypeTrace { cause, .. }) = &sub_origin {
+            if let ObligationCauseCode::ItemObligation(item_def_id) = cause.code {
+                // Same case of `impl Foo for dyn Bar { fn qux(&self) {} }` introducing a `'static`
+                // lifetime as above, but called using a fully-qualified path to the method:
+                // `Foo::qux(bar)`.
+                let mut v = TraitObjectVisitor(vec![]);
+                v.visit_ty(param.param_ty);
+                if let Some((ident, self_ty)) =
+                    self.get_impl_ident_and_self_ty_from_trait(item_def_id, &v.0[..])
+                {
+                    if self.suggest_constrain_dyn_trait_in_impl(&mut err, &v.0[..], ident, self_ty)
+                    {
+                        override_error_code = Some(ident);
+                    }
+                }
+            }
+        }
+        if let (Some(ident), true) = (override_error_code, fn_returns.is_empty()) {
+            // Provide a more targetted error code and description.
+            err.code(rustc_errors::error_code!(E0772));
+            err.set_primary_message(&format!(
+                "{} has {} but calling `{}` introduces an implicit `'static` lifetime \
+                requirement",
+                param_name, lifetime, ident,
+            ));
+        }
+
+        debug!("try_report_static_impl_trait: fn_return={:?}", fn_returns);
+        // FIXME: account for the need of parens in `&(dyn Trait + '_)`
+        let consider = "consider changing the";
+        let declare = "to declare that the";
+        let arg = match param.param.pat.simple_ident() {
+            Some(simple_ident) => format!("argument `{}`", simple_ident),
+            None => "the argument".to_string(),
+        };
+        let explicit = format!("you can add an explicit `{}` lifetime bound", lifetime_name);
+        let explicit_static = format!("explicit `'static` bound to the lifetime of {}", arg);
+        let captures = format!("captures data from {}", arg);
+        let add_static_bound = "alternatively, add an explicit `'static` bound to this reference";
+        let plus_lt = format!(" + {}", lifetime_name);
+        for fn_return in fn_returns {
+            if fn_return.span.desugaring_kind().is_some() {
+                // Skip `async` desugaring `impl Future`.
+                continue;
+            }
+            match fn_return.kind {
+                TyKind::OpaqueDef(item_id, _) => {
+                    let item = tcx.hir().item(item_id.id);
+                    let opaque = if let ItemKind::OpaqueTy(opaque) = &item.kind {
+                        opaque
+                    } else {
+                        err.emit();
+                        return Some(ErrorReported);
+                    };
+
+                    if let Some(span) = opaque
+                        .bounds
+                        .iter()
+                        .filter_map(|arg| match arg {
+                            GenericBound::Outlives(Lifetime {
+                                name: LifetimeName::Static,
+                                span,
+                                ..
+                            }) => Some(*span),
+                            _ => None,
+                        })
+                        .next()
+                    {
+                        err.span_suggestion_verbose(
+                            span,
+                            &format!("{} `impl Trait`'s {}", consider, explicit_static),
+                            lifetime_name.clone(),
+                            Applicability::MaybeIncorrect,
+                        );
+                        err.span_suggestion_verbose(
+                            param.param_ty_span,
+                            add_static_bound,
+                            param.param_ty.to_string(),
+                            Applicability::MaybeIncorrect,
+                        );
+                    } else if let Some(_) = opaque
+                        .bounds
+                        .iter()
+                        .filter_map(|arg| match arg {
+                            GenericBound::Outlives(Lifetime { name, span, .. })
+                                if name.ident().to_string() == lifetime_name =>
+                            {
+                                Some(*span)
+                            }
+                            _ => None,
+                        })
+                        .next()
+                    {
+                    } else {
+                        err.span_suggestion_verbose(
+                            fn_return.span.shrink_to_hi(),
+                            &format!(
+                                "{declare} `impl Trait` {captures}, {explicit}",
+                                declare = declare,
+                                captures = captures,
+                                explicit = explicit,
+                            ),
+                            plus_lt.clone(),
+                            Applicability::MaybeIncorrect,
+                        );
+                    }
+                }
+                TyKind::TraitObject(_, lt) => match lt.name {
+                    LifetimeName::ImplicitObjectLifetimeDefault => {
+                        err.span_suggestion_verbose(
+                            fn_return.span.shrink_to_hi(),
+                            &format!(
+                                "{declare} trait object {captures}, {explicit}",
+                                declare = declare,
+                                captures = captures,
+                                explicit = explicit,
+                            ),
+                            plus_lt.clone(),
+                            Applicability::MaybeIncorrect,
+                        );
+                    }
+                    name if name.ident().to_string() != lifetime_name => {
+                        // With this check we avoid suggesting redundant bounds. This
+                        // would happen if there are nested impl/dyn traits and only
+                        // one of them has the bound we'd suggest already there, like
+                        // in `impl Foo<X = dyn Bar> + '_`.
+                        err.span_suggestion_verbose(
+                            lt.span,
+                            &format!("{} trait object's {}", consider, explicit_static),
+                            lifetime_name.clone(),
+                            Applicability::MaybeIncorrect,
+                        );
+                        err.span_suggestion_verbose(
+                            param.param_ty_span,
+                            add_static_bound,
+                            param.param_ty.to_string(),
+                            Applicability::MaybeIncorrect,
+                        );
+                    }
+                    _ => {}
+                },
+                _ => {}
+            }
+        }
+        err.emit();
+        Some(ErrorReported)
+    }
+
+    fn get_impl_ident_and_self_ty_from_trait(
+        &self,
+        def_id: DefId,
+        trait_objects: &[DefId],
+    ) -> Option<(Ident, &'tcx hir::Ty<'tcx>)> {
+        let tcx = self.tcx();
+        match tcx.hir().get_if_local(def_id) {
+            Some(Node::ImplItem(ImplItem { ident, hir_id, .. })) => {
+                match tcx.hir().find(tcx.hir().get_parent_item(*hir_id)) {
+                    Some(Node::Item(Item { kind: ItemKind::Impl { self_ty, .. }, .. })) => {
+                        Some((*ident, self_ty))
+                    }
+                    _ => None,
+                }
+            }
+            Some(Node::TraitItem(TraitItem { ident, hir_id, .. })) => {
+                let parent_id = tcx.hir().get_parent_item(*hir_id);
+                match tcx.hir().find(parent_id) {
+                    Some(Node::Item(Item { kind: ItemKind::Trait(..), .. })) => {
+                        // The method being called is defined in the `trait`, but the `'static`
+                        // obligation comes from the `impl`. Find that `impl` so that we can point
+                        // at it in the suggestion.
+                        let trait_did = tcx.hir().local_def_id(parent_id).to_def_id();
+                        match tcx
+                            .hir()
+                            .trait_impls(trait_did)
+                            .iter()
+                            .filter_map(|impl_node| {
+                                let impl_did = tcx.hir().local_def_id(*impl_node);
+                                match tcx.hir().get_if_local(impl_did.to_def_id()) {
+                                    Some(Node::Item(Item {
+                                        kind: ItemKind::Impl { self_ty, .. },
+                                        ..
+                                    })) if trait_objects.iter().all(|did| {
+                                        // FIXME: we should check `self_ty` against the receiver
+                                        // type in the `UnifyReceiver` context, but for now, use
+                                        // this imperfect proxy. This will fail if there are
+                                        // multiple `impl`s for the same trait like
+                                        // `impl Foo for Box<dyn Bar>` and `impl Foo for dyn Bar`.
+                                        // In that case, only the first one will get suggestions.
+                                        let mut hir_v = HirTraitObjectVisitor(vec![], *did);
+                                        hir_v.visit_ty(self_ty);
+                                        !hir_v.0.is_empty()
+                                    }) =>
+                                    {
+                                        Some(self_ty)
+                                    }
+                                    _ => None,
+                                }
+                            })
+                            .next()
+                        {
+                            Some(self_ty) => Some((*ident, self_ty)),
+                            _ => None,
+                        }
+                    }
+                    _ => None,
+                }
+            }
+            _ => None,
+        }
+    }
+
+    /// When we call a method coming from an `impl Foo for dyn Bar`, `dyn Bar` introduces a default
+    /// `'static` obligation. Suggest relaxing that implicit bound.
+    fn find_impl_on_dyn_trait(
+        &self,
+        err: &mut DiagnosticBuilder<'_>,
+        ty: Ty<'_>,
+        ctxt: &UnifyReceiverContext<'tcx>,
+    ) -> bool {
+        let tcx = self.tcx();
+
+        // Find the method being called.
+        let instance = match ty::Instance::resolve(
+            tcx,
+            ctxt.param_env,
+            ctxt.assoc_item.def_id,
+            self.infcx.resolve_vars_if_possible(&ctxt.substs),
+        ) {
+            Ok(Some(instance)) => instance,
+            _ => return false,
+        };
+
+        let mut v = TraitObjectVisitor(vec![]);
+        v.visit_ty(ty);
+
+        // Get the `Ident` of the method being called and the corresponding `impl` (to point at
+        // `Bar` in `impl Foo for dyn Bar {}` and the definition of the method being called).
+        let (ident, self_ty) =
+            match self.get_impl_ident_and_self_ty_from_trait(instance.def_id(), &v.0[..]) {
+                Some((ident, self_ty)) => (ident, self_ty),
+                None => return false,
+            };
+
+        // Find the trait object types in the argument, so we point at *only* the trait object.
+        self.suggest_constrain_dyn_trait_in_impl(err, &v.0[..], ident, self_ty)
+    }
+
+    fn suggest_constrain_dyn_trait_in_impl(
+        &self,
+        err: &mut DiagnosticBuilder<'_>,
+        found_dids: &[DefId],
+        ident: Ident,
+        self_ty: &hir::Ty<'_>,
+    ) -> bool {
+        let mut suggested = false;
+        for found_did in found_dids {
+            let mut hir_v = HirTraitObjectVisitor(vec![], *found_did);
+            hir_v.visit_ty(&self_ty);
+            for span in &hir_v.0 {
+                let mut multi_span: MultiSpan = vec![*span].into();
+                multi_span.push_span_label(
+                    *span,
+                    "this has an implicit `'static` lifetime requirement".to_string(),
+                );
+                multi_span.push_span_label(
+                    ident.span,
+                    "calling this method introduces the `impl`'s 'static` requirement".to_string(),
+                );
+                err.span_note(multi_span, "the used `impl` has a `'static` requirement");
+                err.span_suggestion_verbose(
+                    span.shrink_to_hi(),
+                    "consider relaxing the implicit `'static` requirement",
+                    " + '_".to_string(),
+                    Applicability::MaybeIncorrect,
+                );
+                suggested = true;
+            }
+        }
+        suggested
+    }
+}
+
+/// Collect all the trait objects in a type that could have received an implicit `'static` lifetime.
+struct TraitObjectVisitor(Vec<DefId>);
+
+impl TypeVisitor<'_> for TraitObjectVisitor {
+    fn visit_ty(&mut self, t: Ty<'_>) -> bool {
+        match t.kind {
+            ty::Dynamic(preds, RegionKind::ReStatic) => {
+                if let Some(def_id) = preds.principal_def_id() {
+                    self.0.push(def_id);
+                }
+                false
+            }
+            _ => t.super_visit_with(self),
+        }
+    }
+}
+
+/// Collect all `hir::Ty<'_>` `Span`s for trait objects with an implicit lifetime.
+struct HirTraitObjectVisitor(Vec<Span>, DefId);
+
+impl<'tcx> Visitor<'tcx> for HirTraitObjectVisitor {
+    type Map = ErasedMap<'tcx>;
+
+    fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
+        NestedVisitorMap::None
+    }
+
+    fn visit_ty(&mut self, t: &'tcx hir::Ty<'tcx>) {
+        match t.kind {
+            TyKind::TraitObject(
+                poly_trait_refs,
+                Lifetime { name: LifetimeName::ImplicitObjectLifetimeDefault, .. },
+            ) => {
+                for ptr in poly_trait_refs {
+                    if Some(self.1) == ptr.trait_ref.trait_def_id() {
+                        self.0.push(ptr.span);
+                    }
+                }
+            }
+            _ => {}
+        }
+        walk_ty(self, t);
     }
 }

src/librustc_infer/infer/error_reporting/nice_region_error/util.rs

@@ -7,20 +7,18 @@ use rustc_hir::def_id::LocalDefId;
 use rustc_middle::ty::{self, DefIdTree, Region, Ty};
 use rustc_span::Span;
 
-// The struct contains the information about the anonymous region
-// we are searching for.
+/// Information about the anonymous region we are searching for.
 #[derive(Debug)]
 pub(super) struct AnonymousParamInfo<'tcx> {
-    // the parameter corresponding to the anonymous region
+    /// The parameter corresponding to the anonymous region.
     pub param: &'tcx hir::Param<'tcx>,
-    // the type corresponding to the anonymopus region parameter
+    /// The type corresponding to the anonymous region parameter.
     pub param_ty: Ty<'tcx>,
-    // the ty::BoundRegion corresponding to the anonymous region
+    /// The ty::BoundRegion corresponding to the anonymous region.
     pub bound_region: ty::BoundRegion,
-    // param_ty_span contains span of parameter type
+    /// The `Span` of the parameter type.
     pub param_ty_span: Span,
-    // corresponds to id the argument is the first parameter
-    // in the declaration
+    /// Signals that the argument is the first parameter in the declaration.
     pub is_first: bool,
 }
 

src/librustc_infer/infer/mod.rs

@@ -463,7 +463,7 @@ pub enum RegionVariableOrigin {
     AddrOfRegion(Span),
 
     /// Regions created as part of an autoref of a method receiver
-    Autoref(Span),
+    Autoref(Span, ty::AssocItem),
 
     /// Regions created as part of an automatic coercion
     Coercion(Span),
@@ -1800,15 +1800,15 @@ impl<'tcx> SubregionOrigin<'tcx> {
 impl RegionVariableOrigin {
     pub fn span(&self) -> Span {
         match *self {
-            MiscVariable(a) => a,
-            PatternRegion(a) => a,
-            AddrOfRegion(a) => a,
-            Autoref(a) => a,
-            Coercion(a) => a,
-            EarlyBoundRegion(a, ..) => a,
-            LateBoundRegion(a, ..) => a,
+            MiscVariable(a)
+            | PatternRegion(a)
+            | AddrOfRegion(a)
+            | Autoref(a, _)
+            | Coercion(a)
+            | EarlyBoundRegion(a, ..)
+            | LateBoundRegion(a, ..)
+            | UpvarRegion(_, a) => a,
             BoundRegionInCoherence(_) => rustc_span::DUMMY_SP,
-            UpvarRegion(_, a) => a,
             NLL(..) => bug!("NLL variable used with `span`"),
         }
     }

src/librustc_infer/lib.rs

@@ -13,6 +13,7 @@
 //! This API is completely unstable and subject to change.
 
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
+#![feature(bindings_after_at)]
 #![feature(bool_to_option)]
 #![feature(box_patterns)]
 #![feature(box_syntax)]

src/librustc_interface/build.rs

@@ -1,4 +0,0 @@
-fn main() {
-    println!("cargo:rerun-if-changed=build.rs");
-    println!("cargo:rerun-if-env-changed=RUSTC_INSTALL_BINDIR");
-}

src/librustc_llvm/Cargo.toml

@@ -2,7 +2,6 @@
 authors = ["The Rust Project Developers"]
 name = "rustc_llvm"
 version = "0.0.0"
-build = "build.rs"
 edition = "2018"
 
 [lib]
@@ -14,8 +13,8 @@ static-libstdcpp = []
 emscripten = []
 
 [dependencies]
-libc = "0.2"
+libc = "0.2.73"
 
 [build-dependencies]
 build_helper = { path = "../build_helper" }
-cc = "1.0.1"
+cc = "1.0.58"

src/librustc_llvm/build.rs

@@ -2,12 +2,12 @@ use std::env;
 use std::path::{Path, PathBuf};
 use std::process::Command;
 
-use build_helper::output;
+use build_helper::{output, tracked_env_var_os};
 
 fn detect_llvm_link() -> (&'static str, &'static str) {
     // Force the link mode we want, preferring static by default, but
     // possibly overridden by `configure --enable-llvm-link-shared`.
-    if env::var_os("LLVM_LINK_SHARED").is_some() {
+    if tracked_env_var_os("LLVM_LINK_SHARED").is_some() {
         ("dylib", "--link-shared")
     } else {
         ("static", "--link-static")
@@ -15,8 +15,7 @@ fn detect_llvm_link() -> (&'static str, &'static str) {
 }
 
 fn main() {
-    println!("cargo:rerun-if-env-changed=RUST_CHECK");
-    if env::var_os("RUST_CHECK").is_some() {
+    if tracked_env_var_os("RUST_CHECK").is_some() {
         // If we're just running `check`, there's no need for LLVM to be built.
         return;
     }
@@ -25,8 +24,8 @@ fn main() {
 
     let target = env::var("TARGET").expect("TARGET was not set");
     let llvm_config =
-        env::var_os("LLVM_CONFIG").map(|x| Some(PathBuf::from(x))).unwrap_or_else(|| {
-            if let Some(dir) = env::var_os("CARGO_TARGET_DIR").map(PathBuf::from) {
+        tracked_env_var_os("LLVM_CONFIG").map(|x| Some(PathBuf::from(x))).unwrap_or_else(|| {
+            if let Some(dir) = tracked_env_var_os("CARGO_TARGET_DIR").map(PathBuf::from) {
                 let to_test = dir
                     .parent()
                     .unwrap()
@@ -46,8 +45,6 @@ fn main() {
     }
     let llvm_config = llvm_config.unwrap_or_else(|| PathBuf::from("llvm-config"));
 
-    println!("cargo:rerun-if-env-changed=LLVM_CONFIG");
-
     // Test whether we're cross-compiling LLVM. This is a pretty rare case
     // currently where we're producing an LLVM for a different platform than
     // what this build script is currently running on.
@@ -163,12 +160,11 @@ fn main() {
         cfg.define(&flag, None);
     }
 
-    println!("cargo:rerun-if-changed-env=LLVM_RUSTLLVM");
-    if env::var_os("LLVM_RUSTLLVM").is_some() {
+    if tracked_env_var_os("LLVM_RUSTLLVM").is_some() {
         cfg.define("LLVM_RUSTLLVM", None);
     }
 
-    if env::var_os("LLVM_NDEBUG").is_some() {
+    if tracked_env_var_os("LLVM_NDEBUG").is_some() {
         cfg.define("NDEBUG", None);
         cfg.debug(false);
     }
@@ -255,7 +251,7 @@ fn main() {
     // librustc_llvm, for example when using static libc++, we may need to
     // manually specify the library search path and -ldl -lpthread as link
     // dependencies.
-    let llvm_linker_flags = env::var_os("LLVM_LINKER_FLAGS");
+    let llvm_linker_flags = tracked_env_var_os("LLVM_LINKER_FLAGS");
     if let Some(s) = llvm_linker_flags {
         for lib in s.into_string().unwrap().split_whitespace() {
             if lib.starts_with("-l") {
@@ -266,8 +262,8 @@ fn main() {
         }
     }
 
-    let llvm_static_stdcpp = env::var_os("LLVM_STATIC_STDCPP");
-    let llvm_use_libcxx = env::var_os("LLVM_USE_LIBCXX");
+    let llvm_static_stdcpp = tracked_env_var_os("LLVM_STATIC_STDCPP");
+    let llvm_use_libcxx = tracked_env_var_os("LLVM_USE_LIBCXX");
 
     let stdcppname = if target.contains("openbsd") {
         if target.contains("sparc64") { "estdc++" } else { "c++" }

src/librustc_metadata/build.rs

@@ -1,5 +0,0 @@
-fn main() {
-    println!("cargo:rerun-if-changed=build.rs");
-    println!("cargo:rerun-if-env-changed=CFG_VERSION");
-    println!("cargo:rerun-if-env-changed=CFG_VIRTUAL_RUST_SOURCE_BASE_DIR");
-}

src/librustc_middle/build.rs

@@ -1,12 +0,0 @@
-use std::env;
-
-fn main() {
-    println!("cargo:rerun-if-changed=build.rs");
-    println!("cargo:rerun-if-env-changed=CFG_LIBDIR_RELATIVE");
-    println!("cargo:rerun-if-env-changed=CFG_COMPILER_HOST_TRIPLE");
-    println!("cargo:rerun-if-env-changed=RUSTC_VERIFY_LLVM_IR");
-
-    if env::var_os("RUSTC_VERIFY_LLVM_IR").is_some() {
-        println!("cargo:rustc-cfg=always_verify_llvm_ir");
-    }
-}

src/librustc_middle/traits/mod.rs

@@ -169,6 +169,13 @@ impl<'tcx> ObligationCause<'tcx> {
     }
 }
 
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+pub struct UnifyReceiverContext<'tcx> {
+    pub assoc_item: ty::AssocItem,
+    pub param_env: ty::ParamEnv<'tcx>,
+    pub substs: SubstsRef<'tcx>,
+}
+
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
 pub enum ObligationCauseCode<'tcx> {
     /// Not well classified or should be obvious from the span.
@@ -300,6 +307,8 @@ pub enum ObligationCauseCode<'tcx> {
     /// Method receiver
     MethodReceiver,
 
+    UnifyReceiver(Box<UnifyReceiverContext<'tcx>>),
+
     /// `return` with no expression
     ReturnNoExpression,
 

src/librustc_middle/traits/structural_impls.rs

@@ -213,12 +213,26 @@ impl<'a, 'tcx> Lift<'tcx> for traits::ObligationCauseCode<'a> {
             super::StartFunctionType => Some(super::StartFunctionType),
             super::IntrinsicType => Some(super::IntrinsicType),
             super::MethodReceiver => Some(super::MethodReceiver),
+            super::UnifyReceiver(ref ctxt) => tcx.lift(ctxt).map(|ctxt| super::UnifyReceiver(ctxt)),
             super::BlockTailExpression(id) => Some(super::BlockTailExpression(id)),
             super::TrivialBound => Some(super::TrivialBound),
         }
     }
 }
 
+impl<'a, 'tcx> Lift<'tcx> for traits::UnifyReceiverContext<'a> {
+    type Lifted = traits::UnifyReceiverContext<'tcx>;
+    fn lift_to_tcx(&self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+        tcx.lift(&self.param_env).and_then(|param_env| {
+            tcx.lift(&self.substs).map(|substs| traits::UnifyReceiverContext {
+                assoc_item: self.assoc_item,
+                param_env,
+                substs,
+            })
+        })
+    }
+}
+
 impl<'a, 'tcx> Lift<'tcx> for traits::DerivedObligationCause<'a> {
     type Lifted = traits::DerivedObligationCause<'tcx>;
     fn lift_to_tcx(&self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {

src/librustc_middle/ty/mod.rs

@@ -136,7 +136,7 @@ pub struct ResolverOutputs {
     pub extern_prelude: FxHashMap<Symbol, bool>,
 }
 
-#[derive(Clone, Copy, PartialEq, Eq, Debug, HashStable)]
+#[derive(Clone, Copy, PartialEq, Eq, Debug, HashStable, Hash)]
 pub enum AssocItemContainer {
     TraitContainer(DefId),
     ImplContainer(DefId),
@@ -184,7 +184,7 @@ pub enum ImplPolarity {
     Reservation,
 }
 
-#[derive(Copy, Clone, Debug, PartialEq, HashStable)]
+#[derive(Copy, Clone, Debug, PartialEq, HashStable, Eq, Hash)]
 pub struct AssocItem {
     pub def_id: DefId,
     #[stable_hasher(project(name))]
@@ -199,7 +199,7 @@ pub struct AssocItem {
     pub fn_has_self_parameter: bool,
 }
 
-#[derive(Copy, Clone, PartialEq, Debug, HashStable)]
+#[derive(Copy, Clone, PartialEq, Debug, HashStable, Eq, Hash)]
 pub enum AssocKind {
     Const,
     Fn,
@@ -316,7 +316,7 @@ impl<'tcx> AssociatedItems<'tcx> {
     }
 }
 
-#[derive(Clone, Debug, PartialEq, Eq, Copy, RustcEncodable, RustcDecodable, HashStable)]
+#[derive(Clone, Debug, PartialEq, Eq, Copy, RustcEncodable, RustcDecodable, HashStable, Hash)]
 pub enum Visibility {
     /// Visible everywhere (including in other crates).
     Public,

src/librustc_mir/interpret/intrinsics.rs

@@ -12,7 +12,7 @@ use rustc_middle::mir::{
 };
 use rustc_middle::ty;
 use rustc_middle::ty::subst::SubstsRef;
-use rustc_middle::ty::{Ty, TyCtxt};
+use rustc_middle::ty::{Ty, TyCtxt, TypeFoldable};
 use rustc_span::symbol::{sym, Symbol};
 use rustc_target::abi::{Abi, LayoutOf as _, Primitive, Size};
 
@@ -54,6 +54,9 @@ crate fn eval_nullary_intrinsic<'tcx>(
     let name = tcx.item_name(def_id);
     Ok(match name {
         sym::type_name => {
+            if tp_ty.needs_subst() {
+                throw_inval!(TooGeneric);
+            }
             let alloc = type_name::alloc_type_name(tcx, tp_ty);
             ConstValue::Slice { data: alloc, start: 0, end: alloc.len() }
         }
@@ -68,7 +71,12 @@ crate fn eval_nullary_intrinsic<'tcx>(
             };
             ConstValue::from_machine_usize(n, &tcx)
         }
-        sym::type_id => ConstValue::from_u64(tcx.type_id_hash(tp_ty)),
+        sym::type_id => {
+            if tp_ty.needs_subst() {
+                throw_inval!(TooGeneric);
+            }
+            ConstValue::from_u64(tcx.type_id_hash(tp_ty))
+        }
         sym::variant_count => {
             if let ty::Adt(ref adt, _) = tp_ty.kind {
                 ConstValue::from_machine_usize(adt.variants.len() as u64, &tcx)

src/librustc_session/session.rs

@@ -548,7 +548,7 @@ impl Session {
         self.opts.debugging_opts.asm_comments
     }
     pub fn verify_llvm_ir(&self) -> bool {
-        self.opts.debugging_opts.verify_llvm_ir || cfg!(always_verify_llvm_ir)
+        self.opts.debugging_opts.verify_llvm_ir || option_env!("RUSTC_VERIFY_LLVM_IR").is_some()
     }
     pub fn borrowck_stats(&self) -> bool {
         self.opts.debugging_opts.borrowck_stats

src/librustc_target/build.rs

@@ -1,4 +0,0 @@
-fn main() {
-    println!("cargo:rerun-if-changed=build.rs");
-    println!("cargo:rerun-if-env-changed=CFG_DEFAULT_LINKER");
-}

src/librustc_target/spec/aarch64_apple_darwin.rs

@@ -0,0 +1,30 @@
+use crate::spec::{LinkerFlavor, Target, TargetOptions, TargetResult};
+
+pub fn target() -> TargetResult {
+    let mut base = super::apple_base::opts();
+    base.cpu = "apple-a12".to_string();
+    base.max_atomic_width = Some(128);
+    base.pre_link_args.insert(LinkerFlavor::Gcc, vec!["-arch".to_string(), "arm64".to_string()]);
+
+    base.link_env_remove.extend(super::apple_base::macos_link_env_remove());
+
+    // Clang automatically chooses a more specific target based on
+    // MACOSX_DEPLOYMENT_TARGET.  To enable cross-language LTO to work
+    // correctly, we do too.
+    let arch = "aarch64";
+    let llvm_target = super::apple_base::macos_llvm_target(&arch);
+
+    Ok(Target {
+        llvm_target,
+        target_endian: "little".to_string(),
+        target_pointer_width: "64".to_string(),
+        target_c_int_width: "32".to_string(),
+        data_layout: "e-m:o-i64:64-i128:128-n32:64-S128".to_string(),
+        arch: arch.to_string(),
+        target_os: "macos".to_string(),
+        target_env: String::new(),
+        target_vendor: "apple".to_string(),
+        linker_flavor: LinkerFlavor::Gcc,
+        options: TargetOptions { target_mcount: "\u{1}mcount".to_string(), ..base },
+    })
+}

src/librustc_target/spec/apple_base.rs

@@ -31,6 +31,7 @@ pub fn opts() -> TargetOptions {
         has_elf_tls: version >= (10, 7),
         abi_return_struct_as_int: true,
         emit_debug_gdb_scripts: false,
+        eh_frame_header: false,
 
         // This environment variable is pretty magical but is intended for
         // producing deterministic builds. This was first discovered to be used

src/librustc_target/spec/freestanding_base.rs

@@ -25,6 +25,7 @@ pub fn opts() -> TargetOptions {
         has_rpath: false,
         pre_link_args: args,
         position_independent_executables: false,
+        eh_frame_header: false,
         ..Default::default()
     }
 }

src/librustc_target/spec/illumos_base.rs

@@ -23,6 +23,7 @@ pub fn opts() -> TargetOptions {
         is_like_solaris: true,
         limit_rdylib_exports: false, // Linker doesn't support this
         eliminate_frame_pointer: false,
+        eh_frame_header: false,
         late_link_args,
 
         // While we support ELF TLS, rust requires a way to register

src/librustc_target/spec/mod.rs

@@ -574,6 +574,7 @@ supported_targets! {
     ("i686-unknown-haiku", i686_unknown_haiku),
     ("x86_64-unknown-haiku", x86_64_unknown_haiku),
 
+    ("aarch64-apple-darwin", aarch64_apple_darwin),
     ("x86_64-apple-darwin", x86_64_apple_darwin),
     ("i686-apple-darwin", i686_apple_darwin),
 
@@ -987,6 +988,11 @@ pub struct TargetOptions {
     /// Whether to use legacy .ctors initialization hooks rather than .init_array. Defaults
     /// to false (uses .init_array).
     pub use_ctors_section: bool,
+
+    /// Whether the linker is instructed to add a `GNU_EH_FRAME` ELF header
+    /// used to locate unwinding information is passed
+    /// (only has effect if the linker is `ld`-like).
+    pub eh_frame_header: bool,
 }
 
 impl Default for TargetOptions {
@@ -1078,6 +1084,7 @@ impl Default for TargetOptions {
             relax_elf_relocations: false,
             llvm_args: vec![],
             use_ctors_section: false,
+            eh_frame_header: true,
         }
     }
 }
@@ -1470,6 +1477,7 @@ impl Target {
         key!(relax_elf_relocations, bool);
         key!(llvm_args, list);
         key!(use_ctors_section, bool);
+        key!(eh_frame_header, bool);
 
         // NB: The old name is deprecated, but support for it is retained for
         // compatibility.
@@ -1707,6 +1715,7 @@ impl ToJson for Target {
         target_option_val!(relax_elf_relocations);
         target_option_val!(llvm_args);
         target_option_val!(use_ctors_section);
+        target_option_val!(eh_frame_header);
 
         if default.unsupported_abis != self.options.unsupported_abis {
             d.insert(

src/librustc_target/spec/msp430_none_elf.rs

@@ -56,6 +56,8 @@ pub fn target() -> TargetResult {
             // See the thumb_base.rs file for an explanation of this value
             emit_debug_gdb_scripts: false,
 
+            eh_frame_header: false,
+
             ..Default::default()
         },
     })

src/librustc_target/spec/riscv32i_unknown_none_elf.rs

@@ -25,6 +25,7 @@ pub fn target() -> TargetResult {
             relocation_model: RelocModel::Static,
             emit_debug_gdb_scripts: false,
             unsupported_abis: super::riscv_base::unsupported_abis(),
+            eh_frame_header: false,
             ..Default::default()
         },
     })

src/librustc_target/spec/riscv32imac_unknown_none_elf.rs

@@ -25,6 +25,7 @@ pub fn target() -> TargetResult {
             relocation_model: RelocModel::Static,
             emit_debug_gdb_scripts: false,
             unsupported_abis: super::riscv_base::unsupported_abis(),
+            eh_frame_header: false,
             ..Default::default()
         },
     })

src/librustc_target/spec/riscv32imc_unknown_none_elf.rs

@@ -25,6 +25,7 @@ pub fn target() -> TargetResult {
             relocation_model: RelocModel::Static,
             emit_debug_gdb_scripts: false,
             unsupported_abis: super::riscv_base::unsupported_abis(),
+            eh_frame_header: false,
             ..Default::default()
         },
     })

src/librustc_target/spec/riscv64gc_unknown_none_elf.rs

@@ -26,6 +26,7 @@ pub fn target() -> TargetResult {
             code_model: Some(CodeModel::Medium),
             emit_debug_gdb_scripts: false,
             unsupported_abis: super::riscv_base::unsupported_abis(),
+            eh_frame_header: false,
             ..Default::default()
         },
     })

src/librustc_target/spec/riscv64imac_unknown_none_elf.rs

@@ -26,6 +26,7 @@ pub fn target() -> TargetResult {
             code_model: Some(CodeModel::Medium),
             emit_debug_gdb_scripts: false,
             unsupported_abis: super::riscv_base::unsupported_abis(),
+            eh_frame_header: false,
             ..Default::default()
         },
     })

src/librustc_target/spec/solaris_base.rs

@@ -8,6 +8,7 @@ pub fn opts() -> TargetOptions {
         target_family: Some("unix".to_string()),
         is_like_solaris: true,
         limit_rdylib_exports: false, // Linker doesn't support this
+        eh_frame_header: false,
 
         ..Default::default()
     }

src/librustc_target/spec/windows_gnu_base.rs

@@ -91,6 +91,7 @@ pub fn opts() -> TargetOptions {
         abi_return_struct_as_int: true,
         emit_debug_gdb_scripts: false,
         requires_uwtable: true,
+        eh_frame_header: false,
 
         ..Default::default()
     }

src/librustc_target/spec/x86_64_apple_darwin.rs

@@ -5,7 +5,10 @@ pub fn target() -> TargetResult {
     base.cpu = "core2".to_string();
     base.max_atomic_width = Some(128); // core2 support cmpxchg16b
     base.eliminate_frame_pointer = false;
-    base.pre_link_args.insert(LinkerFlavor::Gcc, vec!["-m64".to_string()]);
+    base.pre_link_args.insert(
+        LinkerFlavor::Gcc,
+        vec!["-m64".to_string(), "-arch".to_string(), "x86_64".to_string()],
+    );
     base.link_env_remove.extend(super::apple_base::macos_link_env_remove());
     base.stack_probes = true;
 

src/librustc_trait_selection/traits/codegen/mod.rs

@@ -6,6 +6,7 @@
 use crate::infer::{InferCtxt, TyCtxtInferExt};
 use crate::traits::{
     FulfillmentContext, ImplSource, Obligation, ObligationCause, SelectionContext, TraitEngine,
+    Unimplemented,
 };
 use rustc_errors::ErrorReported;
 use rustc_middle::ty::fold::TypeFoldable;
@@ -58,6 +59,18 @@ pub fn codegen_fulfill_obligation<'tcx>(
                 );
                 return Err(ErrorReported);
             }
+            Err(Unimplemented) => {
+                // This can trigger when we probe for the source of a `'static` lifetime requirement
+                // on a trait object: `impl Foo for dyn Trait {}` has an implicit `'static` bound.
+                infcx.tcx.sess.delay_span_bug(
+                    rustc_span::DUMMY_SP,
+                    &format!(
+                        "Encountered error `Unimplemented` selecting `{:?}` during codegen",
+                        trait_ref
+                    ),
+                );
+                return Err(ErrorReported);
+            }
             Err(e) => {
                 bug!("Encountered error `{:?}` selecting `{:?}` during codegen", e, trait_ref)
             }

src/librustc_trait_selection/traits/error_reporting/suggestions.rs

@@ -1706,6 +1706,7 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
             | ObligationCauseCode::IntrinsicType
             | ObligationCauseCode::MethodReceiver
             | ObligationCauseCode::ReturnNoExpression
+            | ObligationCauseCode::UnifyReceiver(..)
             | ObligationCauseCode::MiscObligation => {}
             ObligationCauseCode::SliceOrArrayElem => {
                 err.note("slice and array elements must have `Sized` type");

src/librustc_typeck/check/method/confirm.rs

@@ -6,6 +6,7 @@ use crate::hir::def_id::DefId;
 use crate::hir::GenericArg;
 use rustc_hir as hir;
 use rustc_infer::infer::{self, InferOk};
+use rustc_middle::traits::{ObligationCauseCode, UnifyReceiverContext};
 use rustc_middle::ty::adjustment::{Adjust, Adjustment, PointerCast};
 use rustc_middle::ty::adjustment::{AllowTwoPhase, AutoBorrow, AutoBorrowMutability};
 use rustc_middle::ty::fold::TypeFoldable;
@@ -91,7 +92,11 @@ impl<'a, 'tcx> ConfirmContext<'a, 'tcx> {
         // signature (which is also done during probing).
         let method_sig_rcvr =
             self.normalize_associated_types_in(self.span, &method_sig.inputs()[0]);
-        self.unify_receivers(self_ty, method_sig_rcvr);
+        debug!(
+            "confirm: self_ty={:?} method_sig_rcvr={:?} method_sig={:?} method_predicates={:?}",
+            self_ty, method_sig_rcvr, method_sig, method_predicates
+        );
+        self.unify_receivers(self_ty, method_sig_rcvr, &pick, all_substs);
 
         let (method_sig, method_predicates) =
             self.normalize_associated_types_in(self.span, &(method_sig, method_predicates));
@@ -150,7 +155,7 @@ impl<'a, 'tcx> ConfirmContext<'a, 'tcx> {
             self.structurally_resolved_type(autoderef.span(), autoderef.final_ty(false));
 
         if let Some(mutbl) = pick.autoref {
-            let region = self.next_region_var(infer::Autoref(self.span));
+            let region = self.next_region_var(infer::Autoref(self.span, pick.item));
             target = self.tcx.mk_ref(region, ty::TypeAndMut { mutbl, ty: target });
             let mutbl = match mutbl {
                 hir::Mutability::Not => AutoBorrowMutability::Not,
@@ -334,8 +339,26 @@ impl<'a, 'tcx> ConfirmContext<'a, 'tcx> {
         )
     }
 
-    fn unify_receivers(&mut self, self_ty: Ty<'tcx>, method_self_ty: Ty<'tcx>) {
-        match self.at(&self.misc(self.span), self.param_env).sup(method_self_ty, self_ty) {
+    fn unify_receivers(
+        &mut self,
+        self_ty: Ty<'tcx>,
+        method_self_ty: Ty<'tcx>,
+        pick: &probe::Pick<'tcx>,
+        substs: SubstsRef<'tcx>,
+    ) {
+        debug!(
+            "unify_receivers: self_ty={:?} method_self_ty={:?} span={:?} pick={:?}",
+            self_ty, method_self_ty, self.span, pick
+        );
+        let cause = self.cause(
+            self.span,
+            ObligationCauseCode::UnifyReceiver(Box::new(UnifyReceiverContext {
+                assoc_item: pick.item,
+                param_env: self.param_env,
+                substs,
+            })),
+        );
+        match self.at(&cause, self.param_env).sup(method_self_ty, self_ty) {
             Ok(InferOk { obligations, value: () }) => {
                 self.register_predicates(obligations);
             }

src/librustc_typeck/collect.rs

@@ -730,7 +730,13 @@ fn convert_trait_item(tcx: TyCtxt<'_>, trait_item_id: hir::HirId) {
             placeholder_type_error(tcx, None, &[], visitor.0, false);
         }
 
-        hir::TraitItemKind::Type(_, None) => {}
+        hir::TraitItemKind::Type(_, None) => {
+            // #74612: Visit and try to find bad placeholders
+            // even if there is no concrete type.
+            let mut visitor = PlaceholderHirTyCollector::default();
+            visitor.visit_trait_item(trait_item);
+            placeholder_type_error(tcx, None, &[], visitor.0, false);
+        }
     };
 
     tcx.ensure().predicates_of(def_id);

src/librustdoc/passes/collect_intra_doc_links.rs

@@ -790,13 +790,20 @@ impl<'a, 'tcx> DocFolder for LinkCollector<'a, 'tcx> {
                 item.attrs.links.push((ori_link, None, fragment));
             } else {
                 debug!("intra-doc link to {} resolved to {:?}", path_str, res);
-                if let Some(local) = res.opt_def_id().and_then(|def_id| def_id.as_local()) {
+
+                // item can be non-local e.g. when using #[doc(primitive = "pointer")]
+                if let Some((src_id, dst_id)) = res
+                    .opt_def_id()
+                    .and_then(|def_id| def_id.as_local())
+                    .and_then(|dst_id| item.def_id.as_local().map(|src_id| (src_id, dst_id)))
+                {
                     use rustc_hir::def_id::LOCAL_CRATE;
 
-                    let hir_id = self.cx.tcx.hir().as_local_hir_id(local);
-                    if !self.cx.tcx.privacy_access_levels(LOCAL_CRATE).is_exported(hir_id)
-                        && (item.visibility == Visibility::Public)
-                        && !self.cx.render_options.document_private
+                    let hir_src = self.cx.tcx.hir().as_local_hir_id(src_id);
+                    let hir_dst = self.cx.tcx.hir().as_local_hir_id(dst_id);
+
+                    if self.cx.tcx.privacy_access_levels(LOCAL_CRATE).is_exported(hir_src)
+                        && !self.cx.tcx.privacy_access_levels(LOCAL_CRATE).is_exported(hir_dst)
                     {
                         privacy_error(cx, &item, &path_str, &dox, link_range);
                         continue;
@@ -1069,6 +1076,13 @@ fn privacy_error(
         if let Some(sp) = sp {
             diag.span_label(sp, "this item is private");
         }
+
+        let note_msg = if cx.render_options.document_private {
+            "this link resolves only because you passed `--document-private-items`, but will break without"
+        } else {
+            "this link will resolve properly if you pass `--document-private-items`"
+        };
+        diag.note(note_msg);
     });
 }
 

src/libstd/Cargo.toml

@@ -2,7 +2,6 @@
 authors = ["The Rust Project Developers"]
 name = "std"
 version = "0.0.0"
-build = "build.rs"
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/rust-lang/rust.git"
 description = "The Rust Standard Library"

src/libstd/build.rs

@@ -1,6 +1,7 @@
 use std::env;
 
 fn main() {
+    println!("cargo:rerun-if-changed=build.rs");
     let target = env::var("TARGET").expect("TARGET was not set");
     if target.contains("linux") {
         if target.contains("android") {

src/libunwind/Cargo.toml

@@ -2,7 +2,6 @@
 authors = ["The Rust Project Developers"]
 name = "unwind"
 version = "0.0.0"
-build = "build.rs"
 edition = "2018"
 include = [
   '/libunwind/*',

src/test/rustdoc-ui/intra-links-private.private.stderr

@@ -0,0 +1,11 @@
+warning: public documentation for `DocMe` links to private item `DontDocMe`
+  --> $DIR/intra-links-private.rs:5:11
+   |
+LL | /// docs [DontDocMe]
+   |           ^^^^^^^^^ this item is private
+   |
+   = note: `#[warn(intra_doc_link_resolution_failure)]` on by default
+   = note: this link resolves only because you passed `--document-private-items`, but will break without
+
+warning: 1 warning emitted
+

src/test/rustdoc-ui/intra-links-private.public.stderr

@@ -1,10 +1,11 @@
 warning: public documentation for `DocMe` links to private item `DontDocMe`
-  --> $DIR/intra-links-private.rs:6:11
+  --> $DIR/intra-links-private.rs:5:11
    |
 LL | /// docs [DontDocMe]
    |           ^^^^^^^^^ this item is private
    |
    = note: `#[warn(intra_doc_link_resolution_failure)]` on by default
+   = note: this link will resolve properly if you pass `--document-private-items`
 
 warning: 1 warning emitted
 

src/test/rustdoc-ui/intra-links-private.rs

@@ -1,10 +1,9 @@
 // check-pass
 // revisions: public private
 // [private]compile-flags: --document-private-items
-#![cfg_attr(private, deny(intra_doc_link_resolution_failure))]
 
 /// docs [DontDocMe]
-//[public]~^ WARNING public documentation for `DocMe` links to private item `DontDocMe`
+//~^ WARNING public documentation for `DocMe` links to private item `DontDocMe`
 // FIXME: for [private] we should also make sure the link was actually generated
 pub struct DocMe;
 struct DontDocMe;

src/test/rustdoc-ui/issue-74134.private.stderr

@@ -0,0 +1,11 @@
+warning: public documentation for `public_item` links to private item `PrivateType`
+  --> $DIR/issue-74134.rs:19:10
+   |
+LL |     /// [`PrivateType`]
+   |          ^^^^^^^^^^^^^ this item is private
+   |
+   = note: `#[warn(intra_doc_link_resolution_failure)]` on by default
+   = note: this link resolves only because you passed `--document-private-items`, but will break without
+
+warning: 1 warning emitted
+

src/test/rustdoc-ui/issue-74134.public.stderr

@@ -5,6 +5,7 @@ LL |     /// [`PrivateType`]
    |          ^^^^^^^^^^^^^ this item is private
    |
    = note: `#[warn(intra_doc_link_resolution_failure)]` on by default
+   = note: this link will resolve properly if you pass `--document-private-items`
 
 warning: 1 warning emitted
 

src/test/rustdoc-ui/issue-74134.rs

@@ -4,7 +4,7 @@
 
 // There are 4 cases here:
 // 1. public item  -> public type:  no warning
-// 2. public item  -> private type: warning, if --document-private-items is not passed
+// 2. public item  -> private type: warning
 // 3. private item -> public type:  no warning
 // 4. private item -> private type: no warning
 // All 4 cases are tested with and without --document-private-items.
@@ -17,7 +17,7 @@ pub struct PublicType;
 pub struct Public {
     /// [`PublicType`]
     /// [`PrivateType`]
-    //[public]~^ WARNING public documentation for `public_item` links to private item `PrivateType`
+    //~^ WARNING public documentation for `public_item` links to private item `PrivateType`
     pub public_item: u32,
 
     /// [`PublicType`]

src/test/ui/associated-types/cache/project-fn-ret-contravariant.rs

@@ -35,7 +35,7 @@ fn baz<'a,'b>(x: &'a u32, y: &'b u32) -> (&'a u32, &'b u32) {
 
 #[cfg(transmute)] // one instantiations: BAD
 fn baz<'a,'b>(x: &'a u32) -> &'static u32 {
-   bar(foo, x) //[transmute]~ ERROR E0495
+   bar(foo, x) //[transmute]~ ERROR E0759
 }
 
 #[cfg(krisskross)] // two instantiations, mixing and matching: BAD

src/test/ui/associated-types/cache/project-fn-ret-contravariant.transmute.stderr

@@ -1,26 +1,11 @@
-error[E0495]: cannot infer an appropriate lifetime due to conflicting requirements
+error[E0759]: `x` has lifetime `'a` but it needs to satisfy a `'static` lifetime requirement
   --> $DIR/project-fn-ret-contravariant.rs:38:8
    |
-LL |    bar(foo, x)
-   |        ^^^
-   |
-note: first, the lifetime cannot outlive the lifetime `'a` as defined on the function body at 37:8...
-  --> $DIR/project-fn-ret-contravariant.rs:37:8
-   |
 LL | fn baz<'a,'b>(x: &'a u32) -> &'static u32 {
-   |        ^^
-note: ...so that reference does not outlive borrowed content
-  --> $DIR/project-fn-ret-contravariant.rs:38:13
-   |
+   |                  ------- this data with lifetime `'a`...
 LL |    bar(foo, x)
-   |             ^
-   = note: but, the lifetime must be valid for the static lifetime...
-note: ...so that reference does not outlive borrowed content
-  --> $DIR/project-fn-ret-contravariant.rs:38:4
-   |
-LL |    bar(foo, x)
-   |    ^^^^^^^^^^^
+   |    ----^^^---- ...is captured and required to live as long as `'static` here
 
 error: aborting due to previous error
 
-For more information about this error, try `rustc --explain E0495`.
+For more information about this error, try `rustc --explain E0759`.

src/test/ui/associated-types/cache/project-fn-ret-invariant.rs

@@ -46,7 +46,7 @@ fn baz<'a, 'b>(x: Type<'a>) -> Type<'static> {
     // Cannot instantiate `foo` with any lifetime other than `'a`,
     // since it is provided as input.
 
-    bar(foo, x) //[transmute]~ ERROR E0495
+    bar(foo, x) //[transmute]~ ERROR E0759
 }
 
 #[cfg(krisskross)] // two instantiations, mixing and matching: BAD

src/test/ui/associated-types/cache/project-fn-ret-invariant.transmute.stderr

@@ -1,30 +1,12 @@
-error[E0495]: cannot infer an appropriate lifetime for lifetime parameter `'a` due to conflicting requirements
+error[E0759]: `x` has lifetime `'a` but it needs to satisfy a `'static` lifetime requirement
   --> $DIR/project-fn-ret-invariant.rs:49:9
    |
-LL |     bar(foo, x)
-   |         ^^^
-   |
-note: first, the lifetime cannot outlive the lifetime `'a` as defined on the function body at 45:8...
-  --> $DIR/project-fn-ret-invariant.rs:45:8
-   |
 LL | fn baz<'a, 'b>(x: Type<'a>) -> Type<'static> {
-   |        ^^
-note: ...so that the expression is assignable
-  --> $DIR/project-fn-ret-invariant.rs:49:14
-   |
+   |                   -------- this data with lifetime `'a`...
+...
 LL |     bar(foo, x)
-   |              ^
-   = note: expected `Type<'_>`
-              found `Type<'a>`
-   = note: but, the lifetime must be valid for the static lifetime...
-note: ...so that the expression is assignable
-  --> $DIR/project-fn-ret-invariant.rs:49:5
-   |
-LL |     bar(foo, x)
-   |     ^^^^^^^^^^^
-   = note: expected `Type<'static>`
-              found `Type<'_>`
+   |     ----^^^---- ...is captured and required to live as long as `'static` here
 
 error: aborting due to previous error
 
-For more information about this error, try `rustc --explain E0495`.
+For more information about this error, try `rustc --explain E0759`.

src/test/ui/async-await/issues/issue-62097.rs

@@ -9,7 +9,7 @@ where
 struct Struct;
 
 impl Struct {
-    pub async fn run_dummy_fn(&self) { //~ ERROR cannot infer
+    pub async fn run_dummy_fn(&self) { //~ ERROR E0759
         foo(|| self.bar()).await;
     }
 

src/test/ui/async-await/issues/issue-62097.stderr

@@ -1,4 +1,4 @@
-error[E0759]: cannot infer an appropriate lifetime
+error[E0759]: `self` has an anonymous lifetime `'_` but it needs to satisfy a `'static` lifetime requirement
   --> $DIR/issue-62097.rs:12:31
    |
 LL |     pub async fn run_dummy_fn(&self) {

src/test/ui/consts/issue-73976-monomorphic.rs

@@ -0,0 +1,36 @@
+// check-pass
+//
+// This test is complement to the test in issue-73976-polymorphic.rs.
+// In that test we ensure that polymorphic use of type_id and type_name in patterns
+// will be properly rejected. This test will ensure that monomorphic use of these
+// would not be wrongly rejected in patterns.
+
+#![feature(const_type_id)]
+#![feature(const_type_name)]
+
+use std::any::{self, TypeId};
+
+pub struct GetTypeId<T>(T);
+
+impl<T: 'static> GetTypeId<T> {
+    pub const VALUE: TypeId = TypeId::of::<T>();
+}
+
+const fn check_type_id<T: 'static>() -> bool {
+    matches!(GetTypeId::<T>::VALUE, GetTypeId::<usize>::VALUE)
+}
+
+pub struct GetTypeNameLen<T>(T);
+
+impl<T: 'static> GetTypeNameLen<T> {
+    pub const VALUE: usize = any::type_name::<T>().len();
+}
+
+const fn check_type_name_len<T: 'static>() -> bool {
+    matches!(GetTypeNameLen::<T>::VALUE, GetTypeNameLen::<usize>::VALUE)
+}
+
+fn main() {
+    assert!(check_type_id::<usize>());
+    assert!(check_type_name_len::<usize>());
+}

src/test/ui/consts/issue-73976-polymorphic.rs

@@ -0,0 +1,40 @@
+// This test is from #73976. We previously did not check if a type is monomorphized
+// before calculating its type id, which leads to the bizzare behaviour below that
+// TypeId of a generic type does not match itself.
+//
+// This test case should either run-pass or be rejected at compile time.
+// Currently we just disallow this usage and require pattern is monomorphic.
+
+#![feature(const_type_id)]
+#![feature(const_type_name)]
+
+use std::any::{self, TypeId};
+
+pub struct GetTypeId<T>(T);
+
+impl<T: 'static> GetTypeId<T> {
+    pub const VALUE: TypeId = TypeId::of::<T>();
+}
+
+const fn check_type_id<T: 'static>() -> bool {
+    matches!(GetTypeId::<T>::VALUE, GetTypeId::<T>::VALUE)
+    //~^ ERROR could not evaluate constant pattern
+    //~| ERROR could not evaluate constant pattern
+}
+
+pub struct GetTypeNameLen<T>(T);
+
+impl<T: 'static> GetTypeNameLen<T> {
+    pub const VALUE: usize = any::type_name::<T>().len();
+}
+
+const fn check_type_name_len<T: 'static>() -> bool {
+    matches!(GetTypeNameLen::<T>::VALUE, GetTypeNameLen::<T>::VALUE)
+    //~^ ERROR could not evaluate constant pattern
+    //~| ERROR could not evaluate constant pattern
+}
+
+fn main() {
+    assert!(check_type_id::<usize>());
+    assert!(check_type_name_len::<usize>());
+}

src/test/ui/consts/issue-73976-polymorphic.stderr

@@ -0,0 +1,26 @@
+error: could not evaluate constant pattern
+  --> $DIR/issue-73976-polymorphic.rs:20:37
+   |
+LL |     matches!(GetTypeId::<T>::VALUE, GetTypeId::<T>::VALUE)
+   |                                     ^^^^^^^^^^^^^^^^^^^^^
+
+error: could not evaluate constant pattern
+  --> $DIR/issue-73976-polymorphic.rs:32:42
+   |
+LL |     matches!(GetTypeNameLen::<T>::VALUE, GetTypeNameLen::<T>::VALUE)
+   |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: could not evaluate constant pattern
+  --> $DIR/issue-73976-polymorphic.rs:20:37
+   |
+LL |     matches!(GetTypeId::<T>::VALUE, GetTypeId::<T>::VALUE)
+   |                                     ^^^^^^^^^^^^^^^^^^^^^
+
+error: could not evaluate constant pattern
+  --> $DIR/issue-73976-polymorphic.rs:32:42
+   |
+LL |     matches!(GetTypeNameLen::<T>::VALUE, GetTypeNameLen::<T>::VALUE)
+   |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 4 previous errors
+

src/test/ui/impl-header-lifetime-elision/dyn-trait.rs

@@ -17,7 +17,7 @@ fn static_val<T: StaticTrait>(_: T) {
 }
 
 fn with_dyn_debug_static<'a>(x: Box<dyn Debug + 'a>) {
-    static_val(x); //~ ERROR cannot infer
+    static_val(x); //~ ERROR E0759
 }
 
 fn not_static_val<T: NotStaticTrait>(_: T) {

src/test/ui/impl-header-lifetime-elision/dyn-trait.stderr

@@ -1,30 +1,17 @@
-error[E0495]: cannot infer an appropriate lifetime due to conflicting requirements
+error[E0759]: `x` has lifetime `'a` but it needs to satisfy a `'static` lifetime requirement
   --> $DIR/dyn-trait.rs:20:16
    |
-LL |     static_val(x);
-   |                ^
-   |
-note: first, the lifetime cannot outlive the lifetime `'a` as defined on the function body at 19:26...
-  --> $DIR/dyn-trait.rs:19:26
-   |
 LL | fn with_dyn_debug_static<'a>(x: Box<dyn Debug + 'a>) {
-   |                          ^^
-note: ...so that the expression is assignable
-  --> $DIR/dyn-trait.rs:20:16
-   |
+   |                                 ------------------- this data with lifetime `'a`...
 LL |     static_val(x);
-   |                ^
-   = note: expected `std::boxed::Box<dyn std::fmt::Debug>`
-              found `std::boxed::Box<(dyn std::fmt::Debug + 'a)>`
-   = note: but, the lifetime must be valid for the static lifetime...
-note: ...so that the types are compatible
+   |                ^ ...is captured here...
+   |
+note: ...and is required to live as long as `'static` here
   --> $DIR/dyn-trait.rs:20:5
    |
 LL |     static_val(x);
    |     ^^^^^^^^^^
-   = note: expected `StaticTrait`
-              found `StaticTrait`
 
 error: aborting due to previous error
 
-For more information about this error, try `rustc --explain E0495`.
+For more information about this error, try `rustc --explain E0759`.

src/test/ui/impl-trait/must_outlive_least_region_or_bound.nll.stderr

@@ -12,7 +12,7 @@ LL | fn elided(x: &i32) -> impl Copy + '_ { x }
    |                       ^^^^^^^^^^^^^^
 
 error: lifetime may not live long enough
-  --> $DIR/must_outlive_least_region_or_bound.rs:6:32
+  --> $DIR/must_outlive_least_region_or_bound.rs:5:32
    |
 LL | fn explicit<'a>(x: &'a i32) -> impl Copy { x }
    |             --                 ^^^^^^^^^ opaque type requires that `'a` must outlive `'static`
@@ -26,7 +26,7 @@ LL | fn explicit<'a>(x: &'a i32) -> impl Copy + 'a { x }
    |                                ^^^^^^^^^^^^^^
 
 error: lifetime may not live long enough
-  --> $DIR/must_outlive_least_region_or_bound.rs:9:46
+  --> $DIR/must_outlive_least_region_or_bound.rs:7:46
    |
 LL | fn elided2(x: &i32) -> impl Copy + 'static { x }
    |               -                              ^ returning this value requires that `'1` must outlive `'static`
@@ -36,7 +36,7 @@ LL | fn elided2(x: &i32) -> impl Copy + 'static { x }
    = help: consider replacing `'1` with `'static`
 
 error: lifetime may not live long enough
-  --> $DIR/must_outlive_least_region_or_bound.rs:12:55
+  --> $DIR/must_outlive_least_region_or_bound.rs:9:55
    |
 LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'static { x }
    |              -- lifetime `'a` defined here            ^ returning this value requires that `'a` must outlive `'static`
@@ -45,7 +45,7 @@ LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'static { x }
    = help: consider replacing `'a` with `'static`
 
 error[E0621]: explicit lifetime required in the type of `x`
-  --> $DIR/must_outlive_least_region_or_bound.rs:15:41
+  --> $DIR/must_outlive_least_region_or_bound.rs:11:41
    |
 LL | fn foo<'a>(x: &i32) -> impl Copy + 'a { x }
    |               ----                      ^ lifetime `'a` required
@@ -53,7 +53,7 @@ LL | fn foo<'a>(x: &i32) -> impl Copy + 'a { x }
    |               help: add explicit lifetime `'a` to the type of `x`: `&'a i32`
 
 error: lifetime may not live long enough
-  --> $DIR/must_outlive_least_region_or_bound.rs:30:24
+  --> $DIR/must_outlive_least_region_or_bound.rs:22:24
    |
 LL | fn elided5(x: &i32) -> (Box<dyn Debug>, impl Debug) { (Box::new(x), x) }
    |               -        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ opaque type requires that `'1` must outlive `'static`
@@ -61,7 +61,7 @@ LL | fn elided5(x: &i32) -> (Box<dyn Debug>, impl Debug) { (Box::new(x), x) }
    |               let's call the lifetime of this reference `'1`
 
 error: lifetime may not live long enough
-  --> $DIR/must_outlive_least_region_or_bound.rs:37:69
+  --> $DIR/must_outlive_least_region_or_bound.rs:28:69
    |
 LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x }
    |               -- lifetime `'a` defined here                         ^ returning this value requires that `'a` must outlive `'static`
@@ -70,7 +70,7 @@ LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x }
    = help: consider replacing `'a` with `'static`
 
 error: lifetime may not live long enough
-  --> $DIR/must_outlive_least_region_or_bound.rs:42:61
+  --> $DIR/must_outlive_least_region_or_bound.rs:32:61
    |
 LL | fn move_lifetime_into_fn<'a, 'b>(x: &'a u32, y: &'b u32) -> impl Fn(&'a u32) {
    |                          --  -- lifetime `'b` defined here  ^^^^^^^^^^^^^^^^ opaque type requires that `'b` must outlive `'a`
@@ -80,7 +80,7 @@ LL | fn move_lifetime_into_fn<'a, 'b>(x: &'a u32, y: &'b u32) -> impl Fn(&'a u32
    = help: consider adding the following bound: `'b: 'a`
 
 error[E0310]: the parameter type `T` may not live long enough
-  --> $DIR/must_outlive_least_region_or_bound.rs:47:51
+  --> $DIR/must_outlive_least_region_or_bound.rs:37:51
    |
 LL | fn ty_param_wont_outlive_static<T:Debug>(x: T) -> impl Debug + 'static {
    |                                                   ^^^^^^^^^^^^^^^^^^^^

src/test/ui/impl-trait/must_outlive_least_region_or_bound.rs

@@ -1,41 +1,31 @@
 use std::fmt::Debug;
 
-fn elided(x: &i32) -> impl Copy { x }
-//~^ ERROR cannot infer an appropriate lifetime
+fn elided(x: &i32) -> impl Copy { x } //~ ERROR E0759
 
-fn explicit<'a>(x: &'a i32) -> impl Copy { x }
-//~^ ERROR cannot infer an appropriate lifetime
+fn explicit<'a>(x: &'a i32) -> impl Copy { x } //~ ERROR E0759
 
-fn elided2(x: &i32) -> impl Copy + 'static { x }
-//~^ ERROR cannot infer an appropriate lifetime
+fn elided2(x: &i32) -> impl Copy + 'static { x } //~ ERROR E0759
 
-fn explicit2<'a>(x: &'a i32) -> impl Copy + 'static { x }
-//~^ ERROR cannot infer an appropriate lifetime
+fn explicit2<'a>(x: &'a i32) -> impl Copy + 'static { x } //~ ERROR E0759
 
 fn foo<'a>(x: &i32) -> impl Copy + 'a { x }
 //~^ ERROR explicit lifetime required in the type of `x`
 
-fn elided3(x: &i32) -> Box<dyn Debug> { Box::new(x) }
-//~^ ERROR cannot infer an appropriate lifetime
+fn elided3(x: &i32) -> Box<dyn Debug> { Box::new(x) } //~ ERROR E0759
 
-fn explicit3<'a>(x: &'a i32) -> Box<dyn Debug> { Box::new(x) }
-//~^ ERROR cannot infer an appropriate lifetime
+fn explicit3<'a>(x: &'a i32) -> Box<dyn Debug> { Box::new(x) } //~ ERROR E0759
 
-fn elided4(x: &i32) -> Box<dyn Debug + 'static> { Box::new(x) }
-//~^ ERROR cannot infer an appropriate lifetime
+fn elided4(x: &i32) -> Box<dyn Debug + 'static> { Box::new(x) } //~ ERROR E0759
 
-fn explicit4<'a>(x: &'a i32) -> Box<dyn Debug + 'static> { Box::new(x) }
-//~^ ERROR cannot infer an appropriate lifetime
+fn explicit4<'a>(x: &'a i32) -> Box<dyn Debug + 'static> { Box::new(x) } //~ ERROR E0759
 
-fn elided5(x: &i32) -> (Box<dyn Debug>, impl Debug) { (Box::new(x), x) }
-//~^ ERROR cannot infer an appropriate lifetime
-//~| ERROR cannot infer an appropriate lifetime
+fn elided5(x: &i32) -> (Box<dyn Debug>, impl Debug) { (Box::new(x), x) } //~ ERROR E0759
+//~^ ERROR E0759
 
 trait LifetimeTrait<'a> {}
 impl<'a> LifetimeTrait<'a> for &'a i32 {}
 
-fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x }
-//~^ ERROR cannot infer an appropriate lifetime
+fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x } //~ ERROR E0759
 
 // Tests that a closure type containing 'b cannot be returned from a type where
 // only 'a was expected.

src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr

@@ -1,4 +1,4 @@
-error[E0759]: cannot infer an appropriate lifetime
+error[E0759]: `x` has an anonymous lifetime `'_` but it needs to satisfy a `'static` lifetime requirement
   --> $DIR/must_outlive_least_region_or_bound.rs:3:35
    |
 LL | fn elided(x: &i32) -> impl Copy { x }
@@ -16,8 +16,8 @@ help: to declare that the `impl Trait` captures data from argument `x`, you can
 LL | fn elided(x: &i32) -> impl Copy + '_ { x }
    |                                 ^^^^
 
-error[E0759]: cannot infer an appropriate lifetime
-  --> $DIR/must_outlive_least_region_or_bound.rs:6:44
+error[E0759]: `x` has lifetime `'a` but it needs to satisfy a `'static` lifetime requirement
+  --> $DIR/must_outlive_least_region_or_bound.rs:5:44
    |
 LL | fn explicit<'a>(x: &'a i32) -> impl Copy { x }
    |                    -------                 ^ ...is captured here...
@@ -25,7 +25,7 @@ LL | fn explicit<'a>(x: &'a i32) -> impl Copy { x }
    |                    this data with lifetime `'a`...
    |
 note: ...and is required to live as long as `'static` here
-  --> $DIR/must_outlive_least_region_or_bound.rs:6:32
+  --> $DIR/must_outlive_least_region_or_bound.rs:5:32
    |
 LL | fn explicit<'a>(x: &'a i32) -> impl Copy { x }
    |                                ^^^^^^^^^
@@ -34,8 +34,8 @@ help: to declare that the `impl Trait` captures data from argument `x`, you can
 LL | fn explicit<'a>(x: &'a i32) -> impl Copy + 'a { x }
    |                                          ^^^^
 
-error[E0759]: cannot infer an appropriate lifetime
-  --> $DIR/must_outlive_least_region_or_bound.rs:9:46
+error[E0759]: `x` has an anonymous lifetime `'_` but it needs to satisfy a `'static` lifetime requirement
+  --> $DIR/must_outlive_least_region_or_bound.rs:7:46
    |
 LL | fn elided2(x: &i32) -> impl Copy + 'static { x }
    |               ----                           ^ ...is captured here...
@@ -43,7 +43,7 @@ LL | fn elided2(x: &i32) -> impl Copy + 'static { x }
    |               this data with an anonymous lifetime `'_`...
    |
 note: ...and is required to live as long as `'static` here
-  --> $DIR/must_outlive_least_region_or_bound.rs:9:24
+  --> $DIR/must_outlive_least_region_or_bound.rs:7:24
    |
 LL | fn elided2(x: &i32) -> impl Copy + 'static { x }
    |                        ^^^^^^^^^^^^^^^^^^^
@@ -56,8 +56,8 @@ help: alternatively, add an explicit `'static` bound to this reference
 LL | fn elided2(x: &'static i32) -> impl Copy + 'static { x }
    |               ^^^^^^^^^^^^
 
-error[E0759]: cannot infer an appropriate lifetime
-  --> $DIR/must_outlive_least_region_or_bound.rs:12:55
+error[E0759]: `x` has lifetime `'a` but it needs to satisfy a `'static` lifetime requirement
+  --> $DIR/must_outlive_least_region_or_bound.rs:9:55
    |
 LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'static { x }
    |                     -------                           ^ ...is captured here...
@@ -65,7 +65,7 @@ LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'static { x }
    |                     this data with lifetime `'a`...
    |
 note: ...and is required to live as long as `'static` here
-  --> $DIR/must_outlive_least_region_or_bound.rs:12:33
+  --> $DIR/must_outlive_least_region_or_bound.rs:9:33
    |
 LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'static { x }
    |                                 ^^^^^^^^^^^^^^^^^^^
@@ -79,15 +79,15 @@ LL | fn explicit2<'a>(x: &'static i32) -> impl Copy + 'static { x }
    |                     ^^^^^^^^^^^^
 
 error[E0621]: explicit lifetime required in the type of `x`
-  --> $DIR/must_outlive_least_region_or_bound.rs:15:24
+  --> $DIR/must_outlive_least_region_or_bound.rs:11:24
    |
 LL | fn foo<'a>(x: &i32) -> impl Copy + 'a { x }
    |               ----     ^^^^^^^^^^^^^^ lifetime `'a` required
    |               |
    |               help: add explicit lifetime `'a` to the type of `x`: `&'a i32`
 
-error[E0759]: cannot infer an appropriate lifetime
-  --> $DIR/must_outlive_least_region_or_bound.rs:30:65
+error[E0759]: `x` has an anonymous lifetime `'_` but it needs to satisfy a `'static` lifetime requirement
+  --> $DIR/must_outlive_least_region_or_bound.rs:22:65
    |
 LL | fn elided5(x: &i32) -> (Box<dyn Debug>, impl Debug) { (Box::new(x), x) }
    |               ---- this data with an anonymous lifetime `'_`... ^ ...is captured here, requiring it to live as long as `'static`
@@ -101,14 +101,14 @@ help: to declare that the `impl Trait` captures data from argument `x`, you can
 LL | fn elided5(x: &i32) -> (Box<dyn Debug>, impl Debug + '_) { (Box::new(x), x) }
    |                                                    ^^^^
 
-error[E0759]: cannot infer an appropriate lifetime
-  --> $DIR/must_outlive_least_region_or_bound.rs:30:69
+error[E0759]: `x` has an anonymous lifetime `'_` but it needs to satisfy a `'static` lifetime requirement
+  --> $DIR/must_outlive_least_region_or_bound.rs:22:69
    |
 LL | fn elided5(x: &i32) -> (Box<dyn Debug>, impl Debug) { (Box::new(x), x) }
    |               ---- this data with an anonymous lifetime `'_`...     ^ ...is captured here...
    |
 note: ...and is required to live as long as `'static` here
-  --> $DIR/must_outlive_least_region_or_bound.rs:30:41
+  --> $DIR/must_outlive_least_region_or_bound.rs:22:41
    |
 LL | fn elided5(x: &i32) -> (Box<dyn Debug>, impl Debug) { (Box::new(x), x) }
    |                                         ^^^^^^^^^^
@@ -121,14 +121,14 @@ help: to declare that the `impl Trait` captures data from argument `x`, you can
 LL | fn elided5(x: &i32) -> (Box<dyn Debug>, impl Debug + '_) { (Box::new(x), x) }
    |                                                    ^^^^
 
-error[E0759]: cannot infer an appropriate lifetime
-  --> $DIR/must_outlive_least_region_or_bound.rs:37:69
+error[E0759]: `x` has lifetime `'a` but it needs to satisfy a `'static` lifetime requirement
+  --> $DIR/must_outlive_least_region_or_bound.rs:28:69
    |
 LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x }
    |                      ------- this data with lifetime `'a`...        ^ ...is captured here...
    |
 note: ...and is required to live as long as `'static` here
-  --> $DIR/must_outlive_least_region_or_bound.rs:37:34
+  --> $DIR/must_outlive_least_region_or_bound.rs:28:34
    |
 LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x }
    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -142,7 +142,7 @@ LL | fn with_bound<'a>(x: &'static i32) -> impl LifetimeTrait<'a> + 'static { x
    |                      ^^^^^^^^^^^^
 
 error[E0623]: lifetime mismatch
-  --> $DIR/must_outlive_least_region_or_bound.rs:42:61
+  --> $DIR/must_outlive_least_region_or_bound.rs:32:61
    |
 LL | fn move_lifetime_into_fn<'a, 'b>(x: &'a u32, y: &'b u32) -> impl Fn(&'a u32) {
    |                                                 -------     ^^^^^^^^^^^^^^^^
@@ -151,15 +151,15 @@ LL | fn move_lifetime_into_fn<'a, 'b>(x: &'a u32, y: &'b u32) -> impl Fn(&'a u32
    |                                                 this parameter and the return type are declared with different lifetimes...
 
 error[E0310]: the parameter type `T` may not live long enough
-  --> $DIR/must_outlive_least_region_or_bound.rs:47:51
+  --> $DIR/must_outlive_least_region_or_bound.rs:37:51
    |
 LL | fn ty_param_wont_outlive_static<T:Debug>(x: T) -> impl Debug + 'static {
    |                                 --                ^^^^^^^^^^^^^^^^^^^^ ...so that the type `T` will meet its required lifetime bounds
    |                                 |
    |                                 help: consider adding an explicit lifetime bound...: `T: 'static +`
 
-error[E0759]: cannot infer an appropriate lifetime
-  --> $DIR/must_outlive_least_region_or_bound.rs:18:50
+error[E0759]: `x` has an anonymous lifetime `'_` but it needs to satisfy a `'static` lifetime requirement
+  --> $DIR/must_outlive_least_region_or_bound.rs:14:50
    |
 LL | fn elided3(x: &i32) -> Box<dyn Debug> { Box::new(x) }
    |               ----                               ^ ...is captured here, requiring it to live as long as `'static`
@@ -171,8 +171,8 @@ help: to declare that the trait object captures data from argument `x`, you can
 LL | fn elided3(x: &i32) -> Box<dyn Debug + '_> { Box::new(x) }
    |                                      ^^^^
 
-error[E0759]: cannot infer an appropriate lifetime
-  --> $DIR/must_outlive_least_region_or_bound.rs:21:59
+error[E0759]: `x` has lifetime `'a` but it needs to satisfy a `'static` lifetime requirement
+  --> $DIR/must_outlive_least_region_or_bound.rs:16:59
    |
 LL | fn explicit3<'a>(x: &'a i32) -> Box<dyn Debug> { Box::new(x) }
    |                     -------                               ^ ...is captured here, requiring it to live as long as `'static`
@@ -184,8 +184,8 @@ help: to declare that the trait object captures data from argument `x`, you can
 LL | fn explicit3<'a>(x: &'a i32) -> Box<dyn Debug + 'a> { Box::new(x) }
    |                                               ^^^^
 
-error[E0759]: cannot infer an appropriate lifetime
-  --> $DIR/must_outlive_least_region_or_bound.rs:24:60
+error[E0759]: `x` has an anonymous lifetime `'_` but it needs to satisfy a `'static` lifetime requirement
+  --> $DIR/must_outlive_least_region_or_bound.rs:18:60
    |
 LL | fn elided4(x: &i32) -> Box<dyn Debug + 'static> { Box::new(x) }
    |               ----                                         ^ ...is captured here, requiring it to live as long as `'static`
@@ -201,8 +201,8 @@ help: alternatively, add an explicit `'static` bound to this reference
 LL | fn elided4(x: &'static i32) -> Box<dyn Debug + 'static> { Box::new(x) }
    |               ^^^^^^^^^^^^
 
-error[E0759]: cannot infer an appropriate lifetime
-  --> $DIR/must_outlive_least_region_or_bound.rs:27:69
+error[E0759]: `x` has lifetime `'a` but it needs to satisfy a `'static` lifetime requirement
+  --> $DIR/must_outlive_least_region_or_bound.rs:20:69
    |
 LL | fn explicit4<'a>(x: &'a i32) -> Box<dyn Debug + 'static> { Box::new(x) }
    |                     ------- this data with lifetime `'a`...         ^ ...is captured here, requiring it to live as long as `'static`

src/test/ui/impl-trait/static-return-lifetime-infered.nll.stderr

@@ -12,7 +12,7 @@ LL |     fn iter_values_anon(&self) -> impl Iterator<Item=u32> + '_ {
    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: lifetime may not live long enough
-  --> $DIR/static-return-lifetime-infered.rs:10:37
+  --> $DIR/static-return-lifetime-infered.rs:9:37
    |
 LL |     fn iter_values<'a>(&'a self) -> impl Iterator<Item=u32> {
    |                    --               ^^^^^^^^^^^^^^^^^^^^^^^ opaque type requires that `'a` must outlive `'static`

src/test/ui/impl-trait/static-return-lifetime-infered.rs

@@ -4,13 +4,11 @@ struct A {
 
 impl A {
     fn iter_values_anon(&self) -> impl Iterator<Item=u32> {
-        self.x.iter().map(|a| a.0)
+        self.x.iter().map(|a| a.0) //~ ERROR E0759
     }
-    //~^^ ERROR cannot infer an appropriate lifetime
     fn iter_values<'a>(&'a self) -> impl Iterator<Item=u32> {
-        self.x.iter().map(|a| a.0)
+        self.x.iter().map(|a| a.0) //~ ERROR E0759
     }
-    //~^^ ERROR cannot infer an appropriate lifetime
 }
 
 fn main() {}

src/test/ui/impl-trait/static-return-lifetime-infered.stderr

@@ -1,4 +1,4 @@
-error[E0759]: cannot infer an appropriate lifetime
+error[E0759]: `self` has an anonymous lifetime `'_` but it needs to satisfy a `'static` lifetime requirement
   --> $DIR/static-return-lifetime-infered.rs:7:16
    |
 LL |     fn iter_values_anon(&self) -> impl Iterator<Item=u32> {
@@ -18,8 +18,8 @@ help: to declare that the `impl Trait` captures data from argument `self`, you c
 LL |     fn iter_values_anon(&self) -> impl Iterator<Item=u32> + '_ {
    |                                                           ^^^^
 
-error[E0759]: cannot infer an appropriate lifetime
-  --> $DIR/static-return-lifetime-infered.rs:11:16
+error[E0759]: `self` has lifetime `'a` but it needs to satisfy a `'static` lifetime requirement
+  --> $DIR/static-return-lifetime-infered.rs:10:16
    |
 LL |     fn iter_values<'a>(&'a self) -> impl Iterator<Item=u32> {
    |                        -------- this data with lifetime `'a`...
@@ -29,7 +29,7 @@ LL |         self.x.iter().map(|a| a.0)
    |         ...is captured here...
    |
 note: ...and is required to live as long as `'static` here
-  --> $DIR/static-return-lifetime-infered.rs:10:37
+  --> $DIR/static-return-lifetime-infered.rs:9:37
    |
 LL |     fn iter_values<'a>(&'a self) -> impl Iterator<Item=u32> {
    |                                     ^^^^^^^^^^^^^^^^^^^^^^^

src/test/ui/issues/issue-16922.rs

@@ -1,8 +1,7 @@
 use std::any::Any;
 
 fn foo<T: Any>(value: &T) -> Box<dyn Any> {
-    Box::new(value) as Box<dyn Any>
-    //~^ ERROR cannot infer an appropriate lifetime
+    Box::new(value) as Box<dyn Any> //~ ERROR E0759
 }
 
 fn main() {

src/test/ui/issues/issue-16922.stderr

@@ -1,4 +1,4 @@
-error[E0759]: cannot infer an appropriate lifetime
+error[E0759]: `value` has an anonymous lifetime `'_` but it needs to satisfy a `'static` lifetime requirement
   --> $DIR/issue-16922.rs:4:14
    |
 LL | fn foo<T: Any>(value: &T) -> Box<dyn Any> {

src/test/ui/nll/user-annotations/constant-in-expr-inherent-1.stderr

@@ -1,28 +1,11 @@
-error[E0495]: cannot infer an appropriate lifetime for lifetime parameter `'a` due to conflicting requirements
+error[E0759]: `fn` parameter has lifetime `'a` but it needs to satisfy a `'static` lifetime requirement
   --> $DIR/constant-in-expr-inherent-1.rs:8:5
    |
-LL |     <Foo<'a>>::C
-   |     ^^^^^^^^^^^^
-   |
-note: first, the lifetime cannot outlive the lifetime `'a` as defined on the function body at 7:8...
-  --> $DIR/constant-in-expr-inherent-1.rs:7:8
-   |
 LL | fn foo<'a>(_: &'a u32) -> &'static u32 {
-   |        ^^
-note: ...so that the types are compatible
-  --> $DIR/constant-in-expr-inherent-1.rs:8:5
-   |
+   |               ------- this data with lifetime `'a`...
 LL |     <Foo<'a>>::C
-   |     ^^^^^^^^^^^^
-   = note: expected `Foo<'_>`
-              found `Foo<'a>`
-   = note: but, the lifetime must be valid for the static lifetime...
-note: ...so that reference does not outlive borrowed content
-  --> $DIR/constant-in-expr-inherent-1.rs:8:5
-   |
-LL |     <Foo<'a>>::C
-   |     ^^^^^^^^^^^^
+   |     ^^^^^^^^^^^^ ...is captured and required to live as long as `'static` here
 
 error: aborting due to previous error
 
-For more information about this error, try `rustc --explain E0495`.
+For more information about this error, try `rustc --explain E0759`.

src/test/ui/object-lifetime/object-lifetime-default-from-box-error.rs

@@ -15,7 +15,7 @@ fn load(ss: &mut SomeStruct) -> Box<dyn SomeTrait> {
     // `Box<SomeTrait>` defaults to a `'static` bound, so this return
     // is illegal.
 
-    ss.r //~ ERROR cannot infer an appropriate lifetime
+    ss.r //~ ERROR E0759
 }
 
 fn store(ss: &mut SomeStruct, b: Box<dyn SomeTrait>) {

src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr

@@ -1,4 +1,4 @@
-error[E0759]: cannot infer an appropriate lifetime
+error[E0759]: `ss` has an anonymous lifetime `'_` but it needs to satisfy a `'static` lifetime requirement
   --> $DIR/object-lifetime-default-from-box-error.rs:18:5
    |
 LL | fn load(ss: &mut SomeStruct) -> Box<dyn SomeTrait> {

src/test/ui/regions/region-object-lifetime-in-coercion.rs

@@ -5,18 +5,18 @@ trait Foo {}
 impl<'a> Foo for &'a [u8] {}
 
 fn a(v: &[u8]) -> Box<dyn Foo + 'static> {
-    let x: Box<dyn Foo + 'static> = Box::new(v); //~ ERROR cannot infer an appropriate lifetime
+    let x: Box<dyn Foo + 'static> = Box::new(v); //~ ERROR E0759
     x
 }
 
 fn b(v: &[u8]) -> Box<dyn Foo + 'static> {
-    Box::new(v) //~ ERROR cannot infer an appropriate lifetime
+    Box::new(v) //~ ERROR E0759
 }
 
 fn c(v: &[u8]) -> Box<dyn Foo> {
     // same as previous case due to RFC 599
 
-    Box::new(v) //~ ERROR cannot infer an appropriate lifetime
+    Box::new(v) //~ ERROR E0759
 }
 
 fn d<'a,'b>(v: &'a [u8]) -> Box<dyn Foo+'b> {

src/test/ui/regions/region-object-lifetime-in-coercion.stderr

@@ -1,4 +1,4 @@
-error[E0759]: cannot infer an appropriate lifetime
+error[E0759]: `v` has an anonymous lifetime `'_` but it needs to satisfy a `'static` lifetime requirement
   --> $DIR/region-object-lifetime-in-coercion.rs:8:46
    |
 LL | fn a(v: &[u8]) -> Box<dyn Foo + 'static> {
@@ -15,7 +15,7 @@ help: alternatively, add an explicit `'static` bound to this reference
 LL | fn a(v: &'static [u8]) -> Box<dyn Foo + 'static> {
    |         ^^^^^^^^^^^^^
 
-error[E0759]: cannot infer an appropriate lifetime
+error[E0759]: `v` has an anonymous lifetime `'_` but it needs to satisfy a `'static` lifetime requirement
   --> $DIR/region-object-lifetime-in-coercion.rs:13:14
    |
 LL | fn b(v: &[u8]) -> Box<dyn Foo + 'static> {
@@ -32,7 +32,7 @@ help: alternatively, add an explicit `'static` bound to this reference
 LL | fn b(v: &'static [u8]) -> Box<dyn Foo + 'static> {
    |         ^^^^^^^^^^^^^
 
-error[E0759]: cannot infer an appropriate lifetime
+error[E0759]: `v` has an anonymous lifetime `'_` but it needs to satisfy a `'static` lifetime requirement
   --> $DIR/region-object-lifetime-in-coercion.rs:19:14
    |
 LL | fn c(v: &[u8]) -> Box<dyn Foo> {

src/test/ui/regions/regions-addr-of-self.rs

@@ -4,7 +4,7 @@ struct Dog {
 
 impl Dog {
     pub fn chase_cat(&mut self) {
-        let p: &'static mut usize = &mut self.cats_chased; //~ ERROR cannot infer
+        let p: &'static mut usize = &mut self.cats_chased; //~ ERROR E0759
         *p += 1;
     }
 

src/test/ui/regions/regions-addr-of-self.stderr

@@ -1,29 +1,11 @@
-error[E0495]: cannot infer an appropriate lifetime for borrow expression due to conflicting requirements
+error[E0759]: `self` has an anonymous lifetime `'_` but it needs to satisfy a `'static` lifetime requirement
   --> $DIR/regions-addr-of-self.rs:7:37
    |
+LL |     pub fn chase_cat(&mut self) {
+   |                      --------- this data with an anonymous lifetime `'_`...
 LL |         let p: &'static mut usize = &mut self.cats_chased;
-   |                                     ^^^^^^^^^^^^^^^^^^^^^
-   |
-note: first, the lifetime cannot outlive the anonymous lifetime #1 defined on the method body at 6:5...
-  --> $DIR/regions-addr-of-self.rs:6:5
-   |
-LL | /     pub fn chase_cat(&mut self) {
-LL | |         let p: &'static mut usize = &mut self.cats_chased;
-LL | |         *p += 1;
-LL | |     }
-   | |_____^
-note: ...so that reference does not outlive borrowed content
-  --> $DIR/regions-addr-of-self.rs:7:37
-   |
-LL |         let p: &'static mut usize = &mut self.cats_chased;
-   |                                     ^^^^^^^^^^^^^^^^^^^^^
-   = note: but, the lifetime must be valid for the static lifetime...
-note: ...so that reference does not outlive borrowed content
-  --> $DIR/regions-addr-of-self.rs:7:37
-   |
-LL |         let p: &'static mut usize = &mut self.cats_chased;
-   |                                     ^^^^^^^^^^^^^^^^^^^^^
+   |                                     ^^^^^^^^^^^^^^^^^^^^^ ...is captured and required to live as long as `'static` here
 
 error: aborting due to previous error
 
-For more information about this error, try `rustc --explain E0495`.
+For more information about this error, try `rustc --explain E0759`.

src/test/ui/regions/regions-close-object-into-object-2.rs

@@ -7,7 +7,7 @@ trait X { }
 impl<'a, T> X for B<'a, T> {}
 
 fn g<'a, T: 'static>(v: Box<dyn A<T> + 'a>) -> Box<dyn X + 'static> {
-    box B(&*v) as Box<dyn X> //~ ERROR cannot infer
+    box B(&*v) as Box<dyn X> //~ ERROR E0759
 }
 
 fn main() { }

src/test/ui/regions/regions-close-object-into-object-2.stderr

@@ -1,4 +1,4 @@
-error[E0759]: cannot infer an appropriate lifetime
+error[E0759]: `v` has lifetime `'a` but it needs to satisfy a `'static` lifetime requirement
   --> $DIR/regions-close-object-into-object-2.rs:10:11
    |
 LL | fn g<'a, T: 'static>(v: Box<dyn A<T> + 'a>) -> Box<dyn X + 'static> {

src/test/ui/regions/regions-close-object-into-object-4.rs

@@ -7,7 +7,7 @@ trait X { }
 impl<'a, T> X for B<'a, T> {}
 
 fn i<'a, T, U>(v: Box<dyn A<U>+'a>) -> Box<dyn X + 'static> {
-    box B(&*v) as Box<dyn X> //~ ERROR cannot infer
+    box B(&*v) as Box<dyn X> //~ ERROR E0759
 }
 
 fn main() {}

src/test/ui/regions/regions-close-object-into-object-4.stderr

@@ -1,4 +1,4 @@
-error[E0759]: cannot infer an appropriate lifetime
+error[E0759]: `v` has lifetime `'a` but it needs to satisfy a `'static` lifetime requirement
   --> $DIR/regions-close-object-into-object-4.rs:10:11
    |
 LL | fn i<'a, T, U>(v: Box<dyn A<U>+'a>) -> Box<dyn X + 'static> {

src/test/ui/regions/regions-proc-bound-capture.rs

@@ -6,7 +6,7 @@ fn borrowed_proc<'a>(x: &'a isize) -> Box<dyn FnMut()->(isize) + 'a> {
 
 fn static_proc(x: &isize) -> Box<dyn FnMut() -> (isize) + 'static> {
     // This is illegal, because the region bound on `proc` is 'static.
-    Box::new(move || { *x }) //~ ERROR cannot infer an appropriate lifetime
+    Box::new(move || { *x }) //~ ERROR E0759
 }
 
 fn main() { }

src/test/ui/regions/regions-proc-bound-capture.stderr

@@ -1,4 +1,4 @@
-error[E0759]: cannot infer an appropriate lifetime
+error[E0759]: `x` has an anonymous lifetime `'_` but it needs to satisfy a `'static` lifetime requirement
   --> $DIR/regions-proc-bound-capture.rs:9:14
    |
 LL | fn static_proc(x: &isize) -> Box<dyn FnMut() -> (isize) + 'static> {

src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.rs

@@ -6,7 +6,7 @@ struct Foo;
 
 impl Foo {
     async fn f(self: Pin<&Self>) -> impl Clone { self }
-    //~^ ERROR cannot infer an appropriate lifetime
+    //~^ ERROR E0759
 }
 
 fn main() {

src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr

@@ -1,4 +1,4 @@
-error[E0759]: cannot infer an appropriate lifetime
+error[E0759]: `self` has an anonymous lifetime `'_` but it needs to satisfy a `'static` lifetime requirement
   --> $DIR/arbitrary_self_types_pin_lifetime_impl_trait-async.rs:8:16
    |
 LL |     async fn f(self: Pin<&Self>) -> impl Clone { self }

src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.rs

@@ -3,7 +3,7 @@ use std::pin::Pin;
 struct Foo;
 
 impl Foo {
-    fn f(self: Pin<&Self>) -> impl Clone { self } //~ ERROR cannot infer an appropriate lifetime
+    fn f(self: Pin<&Self>) -> impl Clone { self } //~ ERROR E0759
 }
 
 fn main() {

src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr

@@ -1,4 +1,4 @@
-error[E0759]: cannot infer an appropriate lifetime
+error[E0759]: `self` has an anonymous lifetime `'_` but it needs to satisfy a `'static` lifetime requirement
   --> $DIR/arbitrary_self_types_pin_lifetime_impl_trait.rs:6:44
    |
 LL |     fn f(self: Pin<&Self>) -> impl Clone { self }

src/test/ui/suggestions/impl-on-dyn-trait-with-implicit-static-bound-needing-more-suggestions.nll.stderr

@@ -0,0 +1,37 @@
+error[E0597]: `val` does not live long enough
+  --> $DIR/impl-on-dyn-trait-with-implicit-static-bound-needing-more-suggestions.rs:21:9
+   |
+LL |     fn use_it<'a>(val: Box<dyn ObjectTrait<Assoc = i32>>) -> impl OtherTrait<'a> {
+   |               -- lifetime `'a` defined here                  ------------------- opaque type requires that `val` is borrowed for `'a`
+LL |         val.use_self()
+   |         ^^^ borrowed value does not live long enough
+LL |     }
+   |     - `val` dropped here while still borrowed
+   |
+help: you can add a bound to the opaque type to make it last less than `'static` and match `'a`
+   |
+LL |     fn use_it<'a>(val: Box<dyn ObjectTrait<Assoc = i32>>) -> impl OtherTrait<'a> + 'a {
+   |                                                                                  ^^^^
+
+error[E0515]: cannot return value referencing function parameter `val`
+  --> $DIR/impl-on-dyn-trait-with-implicit-static-bound-needing-more-suggestions.rs:43:9
+   |
+LL |         val.use_self()
+   |         ---^^^^^^^^^^^
+   |         |
+   |         returns a value referencing data owned by the current function
+   |         `val` is borrowed here
+
+error[E0515]: cannot return value referencing function parameter `val`
+  --> $DIR/impl-on-dyn-trait-with-implicit-static-bound-needing-more-suggestions.rs:109:9
+   |
+LL |         val.use_self()
+   |         ---^^^^^^^^^^^
+   |         |
+   |         returns a value referencing data owned by the current function
+   |         `val` is borrowed here
+
+error: aborting due to 3 previous errors
+
+Some errors have detailed explanations: E0515, E0597.
+For more information about an error, try `rustc --explain E0515`.