Rollup merge of #64907 - alexreg:tidy-up, r=Mark-Simulacrum

A small amount of tidying-up factored out from PR #64648

As requested by @Mark-Simulacrum, I put this in a separate commit to make it easier to review. (As far as I can tell, no violations of the policy here, and they are simply in a separate PR because they're not directly related to the import of that PR.)

r? @Mark-Simulacrum

src/libfmt_macros/lib.rs

@@ -410,7 +410,7 @@ impl<'a> Parser<'a> {
         &self.input[start..self.input.len()]
     }
 
-    /// Parses an Argument structure, or what's contained within braces inside the format string
+    /// Parses an `Argument` structure, or what's contained within braces inside the format string.
     fn argument(&mut self) -> Argument<'a> {
         let pos = self.position();
         let format = self.format();
@@ -464,7 +464,7 @@ impl<'a> Parser<'a> {
     }
 
     /// Parses a format specifier at the current position, returning all of the
-    /// relevant information in the FormatSpec struct.
+    /// relevant information in the `FormatSpec` struct.
     fn format(&mut self) -> FormatSpec<'a> {
         let mut spec = FormatSpec {
             fill: None,
@@ -571,7 +571,7 @@ impl<'a> Parser<'a> {
         spec
     }
 
-    /// Parses a Count parameter at the current position. This does not check
+    /// Parses a `Count` parameter at the current position. This does not check
     /// for 'CountIsNextParam' because that is only used in precision, not
     /// width.
     fn count(&mut self, start: usize) -> (Count, Option<InnerSpan>) {

src/librustc_interface/passes.rs

@@ -247,7 +247,7 @@ pub fn register_plugins<'a>(
     rustc_incremental::prepare_session_directory(sess, &crate_name, disambiguator);
 
     if sess.opts.incremental.is_some() {
-        time(sess, "garbage collect incremental cache directory", || {
+        time(sess, "garbage-collect incremental cache directory", || {
             if let Err(e) = rustc_incremental::garbage_collect_session_directories(sess) {
                 warn!(
                     "Error while trying to garbage collect incremental \
@@ -318,7 +318,7 @@ fn configure_and_expand_inner<'a>(
     crate_loader: &'a mut CrateLoader<'a>,
     plugin_info: PluginInfo,
 ) -> Result<(ast::Crate, Resolver<'a>)> {
-    time(sess, "pre ast expansion lint checks", || {
+    time(sess, "pre-AST-expansion lint checks", || {
         lint::check_ast_crate(
             sess,
             &krate,
@@ -536,8 +536,8 @@ pub fn lower_to_hir(
     dep_graph: &DepGraph,
     krate: &ast::Crate,
 ) -> Result<hir::map::Forest> {
-    // Lower ast -> hir
-    let hir_forest = time(sess, "lowering ast -> hir", || {
+    // Lower AST to HIR.
+    let hir_forest = time(sess, "lowering AST -> HIR", || {
         let hir_crate = lower_crate(sess, cstore, &dep_graph, &krate, resolver);
 
         if sess.opts.debugging_opts.hir_stats {
@@ -757,7 +757,7 @@ pub fn prepare_outputs(
     if !only_dep_info {
         if let Some(ref dir) = compiler.output_dir {
             if fs::create_dir_all(dir).is_err() {
-                sess.err("failed to find or create the directory specified by --out-dir");
+                sess.err("failed to find or create the directory specified by `--out-dir`");
                 return Err(ErrorReported);
             }
         }
@@ -830,8 +830,8 @@ pub fn create_global_ctxt(
         let global_ctxt: Option<GlobalCtxt<'_>>;
         let arenas = AllArenas::new();
 
-        // Construct the HIR map
-        let hir_map = time(sess, "indexing hir", || {
+        // Construct the HIR map.
+        let hir_map = time(sess, "indexing HIR", || {
             hir::map::map_crate(sess, cstore, &mut hir_forest, &defs)
         });
 
@@ -942,7 +942,7 @@ fn analysis(tcx: TyCtxt<'_>, cnum: CrateNum) -> Result<()> {
         tcx.par_body_owners(|def_id| tcx.ensure().mir_borrowck(def_id));
     });
 
-    time(sess, "dumping chalk-like clauses", || {
+    time(sess, "dumping Chalk-like clauses", || {
         rustc_traits::lowering::dump_program_clauses(tcx);
     });
 

src/librustc_typeck/astconv.rs

@@ -952,8 +952,8 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
                         tcx.sess.span_warn(
                             span,
                             "default bound relaxed for a type parameter, but \
-                            this does nothing because the given bound is not \
-                            a default. Only `?Sized` is supported",
+                             this does nothing because the given bound is not \
+                             a default; only `?Sized` is supported",
                         );
                     }
                 }

src/librustc_typeck/check/method/suggest.rs

@@ -631,26 +631,30 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
     }
 
-    fn suggest_valid_traits(&self,
-                            err: &mut DiagnosticBuilder<'_>,
-                            valid_out_of_scope_traits: Vec<DefId>) -> bool {
+    fn suggest_valid_traits(
+        &self,
+        err: &mut DiagnosticBuilder<'_>,
+        valid_out_of_scope_traits: Vec<DefId>,
+    ) -> bool {
         if !valid_out_of_scope_traits.is_empty() {
             let mut candidates = valid_out_of_scope_traits;
             candidates.sort();
             candidates.dedup();
             err.help("items from traits can only be used if the trait is in scope");
-            let msg = format!("the following {traits_are} implemented but not in scope, \
-                               perhaps add a `use` for {one_of_them}:",
-                            traits_are = if candidates.len() == 1 {
-                                "trait is"
-                            } else {
-                                "traits are"
-                            },
-                            one_of_them = if candidates.len() == 1 {
-                                "it"
-                            } else {
-                                "one of them"
-                            });
+            let msg = format!(
+                "the following {traits_are} implemented but not in scope; \
+                 perhaps add a `use` for {one_of_them}:",
+                traits_are = if candidates.len() == 1 {
+                    "trait is"
+                } else {
+                    "traits are"
+                },
+                one_of_them = if candidates.len() == 1 {
+                    "it"
+                } else {
+                    "one of them"
+                },
+            );
 
             self.suggest_use_candidates(err, msg, candidates);
             true

src/libsyntax/parse/lexer/mod.rs

@@ -47,7 +47,7 @@ impl<'a> StringReader<'a> {
                source_file: Lrc<syntax_pos::SourceFile>,
                override_span: Option<Span>) -> Self {
         if source_file.src.is_none() {
-            sess.span_diagnostic.bug(&format!("Cannot lex source_file without source: {}",
+            sess.span_diagnostic.bug(&format!("cannot lex `source_file` without source: {}",
                                               source_file.name));
         }
 

src/libsyntax_pos/lib.rs

@@ -884,7 +884,7 @@ pub struct OffsetOverflowError;
 /// A single source in the `SourceMap`.
 #[derive(Clone)]
 pub struct SourceFile {
-    /// The name of the file that the source came from, source that doesn't
+    /// The name of the file that the source came from. Source that doesn't
     /// originate from files has names between angle brackets by convention
     /// (e.g., `<anon>`).
     pub name: FileName,
@@ -922,9 +922,9 @@ impl Encodable for SourceFile {
             s.emit_struct_field("name", 0, |s| self.name.encode(s))?;
             s.emit_struct_field("name_was_remapped", 1, |s| self.name_was_remapped.encode(s))?;
             s.emit_struct_field("src_hash", 2, |s| self.src_hash.encode(s))?;
-            s.emit_struct_field("start_pos", 4, |s| self.start_pos.encode(s))?;
-            s.emit_struct_field("end_pos", 5, |s| self.end_pos.encode(s))?;
-            s.emit_struct_field("lines", 6, |s| {
+            s.emit_struct_field("start_pos", 3, |s| self.start_pos.encode(s))?;
+            s.emit_struct_field("end_pos", 4, |s| self.end_pos.encode(s))?;
+            s.emit_struct_field("lines", 5, |s| {
                 let lines = &self.lines[..];
                 // Store the length.
                 s.emit_u32(lines.len() as u32)?;
@@ -970,13 +970,13 @@ impl Encodable for SourceFile {
 
                 Ok(())
             })?;
-            s.emit_struct_field("multibyte_chars", 7, |s| {
+            s.emit_struct_field("multibyte_chars", 6, |s| {
                 self.multibyte_chars.encode(s)
             })?;
-            s.emit_struct_field("non_narrow_chars", 8, |s| {
+            s.emit_struct_field("non_narrow_chars", 7, |s| {
                 self.non_narrow_chars.encode(s)
             })?;
-            s.emit_struct_field("name_hash", 9, |s| {
+            s.emit_struct_field("name_hash", 8, |s| {
                 self.name_hash.encode(s)
             })
         })
@@ -985,7 +985,6 @@ impl Encodable for SourceFile {
 
 impl Decodable for SourceFile {
     fn decode<D: Decoder>(d: &mut D) -> Result<SourceFile, D::Error> {
-
         d.read_struct("SourceFile", 8, |d| {
             let name: FileName = d.read_struct_field("name", 0, |d| Decodable::decode(d))?;
             let name_was_remapped: bool =
@@ -993,9 +992,9 @@ impl Decodable for SourceFile {
             let src_hash: u128 =
                 d.read_struct_field("src_hash", 2, |d| Decodable::decode(d))?;
             let start_pos: BytePos =
-                d.read_struct_field("start_pos", 4, |d| Decodable::decode(d))?;
-            let end_pos: BytePos = d.read_struct_field("end_pos", 5, |d| Decodable::decode(d))?;
-            let lines: Vec<BytePos> = d.read_struct_field("lines", 6, |d| {
+                d.read_struct_field("start_pos", 3, |d| Decodable::decode(d))?;
+            let end_pos: BytePos = d.read_struct_field("end_pos", 4, |d| Decodable::decode(d))?;
+            let lines: Vec<BytePos> = d.read_struct_field("lines", 5, |d| {
                 let num_lines: u32 = Decodable::decode(d)?;
                 let mut lines = Vec::with_capacity(num_lines as usize);
 
@@ -1024,18 +1023,18 @@ impl Decodable for SourceFile {
                 Ok(lines)
             })?;
             let multibyte_chars: Vec<MultiByteChar> =
-                d.read_struct_field("multibyte_chars", 7, |d| Decodable::decode(d))?;
+                d.read_struct_field("multibyte_chars", 6, |d| Decodable::decode(d))?;
             let non_narrow_chars: Vec<NonNarrowChar> =
-                d.read_struct_field("non_narrow_chars", 8, |d| Decodable::decode(d))?;
+                d.read_struct_field("non_narrow_chars", 7, |d| Decodable::decode(d))?;
             let name_hash: u128 =
-                d.read_struct_field("name_hash", 9, |d| Decodable::decode(d))?;
+                d.read_struct_field("name_hash", 8, |d| Decodable::decode(d))?;
             Ok(SourceFile {
                 name,
                 name_was_remapped,
                 unmapped_path: None,
                 // `crate_of_origin` has to be set by the importer.
-                // This value matches up with rustc::hir::def_id::INVALID_CRATE.
-                // That constant is not available here unfortunately :(
+                // This value matches up with `rustc::hir::def_id::INVALID_CRATE`.
+                // That constant is not available here, unfortunately.
                 crate_of_origin: std::u32::MAX - 1,
                 start_pos,
                 end_pos,

src/test/ui/coherence/coherence_inherent.old.stderr

@@ -5,7 +5,7 @@ LL |         s.the_fn();
    |           ^^^^^^ method not found in `&Lib::TheStruct`
    |
    = help: items from traits can only be used if the trait is in scope
-   = note: the following trait is implemented but not in scope, perhaps add a `use` for it:
+   = note: the following trait is implemented but not in scope; perhaps add a `use` for it:
            `use Lib::TheTrait;`
 
 error: aborting due to previous error

src/test/ui/coherence/coherence_inherent.re.stderr

@@ -5,7 +5,7 @@ LL |         s.the_fn();
    |           ^^^^^^ method not found in `&Lib::TheStruct`
    |
    = help: items from traits can only be used if the trait is in scope
-   = note: the following trait is implemented but not in scope, perhaps add a `use` for it:
+   = note: the following trait is implemented but not in scope; perhaps add a `use` for it:
            `use Lib::TheTrait;`
 
 error: aborting due to previous error

src/test/ui/coherence/coherence_inherent_cc.old.stderr

@@ -5,7 +5,7 @@ LL |         s.the_fn();
    |           ^^^^^^ method not found in `&coherence_inherent_cc_lib::TheStruct`
    |
    = help: items from traits can only be used if the trait is in scope
-   = note: the following trait is implemented but not in scope, perhaps add a `use` for it:
+   = note: the following trait is implemented but not in scope; perhaps add a `use` for it:
            `use coherence_inherent_cc_lib::TheTrait;`
 
 error: aborting due to previous error

src/test/ui/coherence/coherence_inherent_cc.re.stderr

@@ -5,7 +5,7 @@ LL |         s.the_fn();
    |           ^^^^^^ method not found in `&coherence_inherent_cc_lib::TheStruct`
    |
    = help: items from traits can only be used if the trait is in scope
-   = note: the following trait is implemented but not in scope, perhaps add a `use` for it:
+   = note: the following trait is implemented but not in scope; perhaps add a `use` for it:
            `use coherence_inherent_cc_lib::TheTrait;`
 
 error: aborting due to previous error

src/test/ui/hygiene/no_implicit_prelude.stderr

@@ -25,7 +25,7 @@ LL |         ().clone()
    |            ^^^^^ method not found in `()`
    |
    = help: items from traits can only be used if the trait is in scope
-   = note: the following trait is implemented but not in scope, perhaps add a `use` for it:
+   = note: the following trait is implemented but not in scope; perhaps add a `use` for it:
            `use std::clone::Clone;`
 
 error: aborting due to 3 previous errors

src/test/ui/hygiene/trait_items.stderr

@@ -8,7 +8,7 @@ LL |     pub macro m() { ().f() }
    |                        ^ method not found in `()`
    |
    = help: items from traits can only be used if the trait is in scope
-   = note: the following trait is implemented but not in scope, perhaps add a `use` for it:
+   = note: the following trait is implemented but not in scope; perhaps add a `use` for it:
            `use foo::T;`
 
 error: aborting due to previous error

src/test/ui/impl-trait/no-method-suggested-traits.stderr

@@ -5,7 +5,7 @@ LL |     1u32.method();
    |          ^^^^^^ method not found in `u32`
    |
    = help: items from traits can only be used if the trait is in scope
-help: the following traits are implemented but not in scope, perhaps add a `use` for one of them:
+help: the following traits are implemented but not in scope; perhaps add a `use` for one of them:
    |
 LL | use foo::Bar;
    |
@@ -23,7 +23,7 @@ LL |     std::rc::Rc::new(&mut Box::new(&1u32)).method();
    |                                            ^^^^^^ method not found in `std::rc::Rc<&mut std::boxed::Box<&u32>>`
    |
    = help: items from traits can only be used if the trait is in scope
-help: the following traits are implemented but not in scope, perhaps add a `use` for one of them:
+help: the following traits are implemented but not in scope; perhaps add a `use` for one of them:
    |
 LL | use foo::Bar;
    |
@@ -41,7 +41,7 @@ LL |     'a'.method();
    |         ^^^^^^ method not found in `char`
    |
    = help: items from traits can only be used if the trait is in scope
-help: the following trait is implemented but not in scope, perhaps add a `use` for it:
+help: the following trait is implemented but not in scope; perhaps add a `use` for it:
    |
 LL | use foo::Bar;
    |
@@ -61,7 +61,7 @@ LL |     std::rc::Rc::new(&mut Box::new(&'a')).method();
    |                                           ^^^^^^ method not found in `std::rc::Rc<&mut std::boxed::Box<&char>>`
    |
    = help: items from traits can only be used if the trait is in scope
-help: the following trait is implemented but not in scope, perhaps add a `use` for it:
+help: the following trait is implemented but not in scope; perhaps add a `use` for it:
    |
 LL | use foo::Bar;
    |
@@ -73,7 +73,7 @@ LL |     1i32.method();
    |          ^^^^^^ method not found in `i32`
    |
    = help: items from traits can only be used if the trait is in scope
-help: the following trait is implemented but not in scope, perhaps add a `use` for it:
+help: the following trait is implemented but not in scope; perhaps add a `use` for it:
    |
 LL | use no_method_suggested_traits::foo::PubPub;
    |
@@ -85,7 +85,7 @@ LL |     std::rc::Rc::new(&mut Box::new(&1i32)).method();
    |                                            ^^^^^^ method not found in `std::rc::Rc<&mut std::boxed::Box<&i32>>`
    |
    = help: items from traits can only be used if the trait is in scope
-help: the following trait is implemented but not in scope, perhaps add a `use` for it:
+help: the following trait is implemented but not in scope; perhaps add a `use` for it:
    |
 LL | use no_method_suggested_traits::foo::PubPub;
    |

src/test/ui/issues/issue-10465.stderr

@@ -5,7 +5,7 @@ LL |             b.foo();
    |               ^^^ method not found in `&b::B`
    |
    = help: items from traits can only be used if the trait is in scope
-   = note: the following trait is implemented but not in scope, perhaps add a `use` for it:
+   = note: the following trait is implemented but not in scope; perhaps add a `use` for it:
            `use a::A;`
 
 error: aborting due to previous error

src/test/ui/issues/issue-37534.stderr

@@ -8,7 +8,7 @@ help: possible better candidate is found in another module, you can import it in
 LL | use std::hash::Hash;
    |
 
-warning: default bound relaxed for a type parameter, but this does nothing because the given bound is not a default. Only `?Sized` is supported
+warning: default bound relaxed for a type parameter, but this does nothing because the given bound is not a default; only `?Sized` is supported
   --> $DIR/issue-37534.rs:1:12
    |
 LL | struct Foo<T: ?Hash> { }

src/test/ui/issues/issue-39175.stderr

@@ -5,7 +5,7 @@ LL |     Command::new("echo").arg("hello").exec();
    |                                       ^^^^ method not found in `&mut std::process::Command`
    |
    = help: items from traits can only be used if the trait is in scope
-help: the following trait is implemented but not in scope, perhaps add a `use` for it:
+help: the following trait is implemented but not in scope; perhaps add a `use` for it:
    |
 LL | use std::os::unix::process::CommandExt;
    |

src/test/ui/issues/issue-43189.stderr

@@ -5,7 +5,7 @@ LL |     ().a();
    |        ^ method not found in `()`
    |
    = help: items from traits can only be used if the trait is in scope
-help: the following trait is implemented but not in scope, perhaps add a `use` for it:
+help: the following trait is implemented but not in scope; perhaps add a `use` for it:
    |
 LL | use xcrate_issue_43189_b::xcrate_issue_43189_a::A;
    |

src/test/ui/maybe-bounds-where.stderr

@@ -34,7 +34,7 @@ error[E0203]: type parameter has more than one relaxed default bound, only one i
 LL | struct S5<T>(*const T) where T: ?Trait<'static> + ?Sized;
    |           ^
 
-warning: default bound relaxed for a type parameter, but this does nothing because the given bound is not a default. Only `?Sized` is supported
+warning: default bound relaxed for a type parameter, but this does nothing because the given bound is not a default; only `?Sized` is supported
   --> $DIR/maybe-bounds-where.rs:15:11
    |
 LL | struct S5<T>(*const T) where T: ?Trait<'static> + ?Sized;

src/test/ui/rust-2018/trait-import-suggestions.stderr

@@ -5,7 +5,7 @@ LL |         x.foobar();
    |           ^^^^^^ method not found in `u32`
    |
    = help: items from traits can only be used if the trait is in scope
-   = note: the following trait is implemented but not in scope, perhaps add a `use` for it:
+   = note: the following trait is implemented but not in scope; perhaps add a `use` for it:
            `use crate::foo::foobar::Foobar;`
 
 error[E0599]: no method named `bar` found for type `u32` in the current scope
@@ -15,7 +15,7 @@ LL |     x.bar();
    |       ^^^ method not found in `u32`
    |
    = help: items from traits can only be used if the trait is in scope
-help: the following trait is implemented but not in scope, perhaps add a `use` for it:
+help: the following trait is implemented but not in scope; perhaps add a `use` for it:
    |
 LL | use crate::foo::Bar;
    |
@@ -33,7 +33,7 @@ LL |     let y = u32::from_str("33");
    |                  ^^^^^^^^ function or associated item not found in `u32`
    |
    = help: items from traits can only be used if the trait is in scope
-help: the following trait is implemented but not in scope, perhaps add a `use` for it:
+help: the following trait is implemented but not in scope; perhaps add a `use` for it:
    |
 LL | use std::str::FromStr;
    |

src/test/ui/shadowed/shadowed-trait-methods.stderr

@@ -5,7 +5,7 @@ LL |     ().f()
    |        ^ method not found in `()`
    |
    = help: items from traits can only be used if the trait is in scope
-help: the following trait is implemented but not in scope, perhaps add a `use` for it:
+help: the following trait is implemented but not in scope; perhaps add a `use` for it:
    |
 LL | use foo::T;
    |

src/test/ui/traits/trait-item-privacy.stderr

@@ -28,7 +28,7 @@ LL |     S.b();
    |       ^ method not found in `S`
    |
    = help: items from traits can only be used if the trait is in scope
-help: the following trait is implemented but not in scope, perhaps add a `use` for it:
+help: the following trait is implemented but not in scope; perhaps add a `use` for it:
    |
 LL | use method::B;
    |
@@ -62,7 +62,7 @@ LL |     S::b(&S);
    |        ^ function or associated item not found in `S`
    |
    = help: items from traits can only be used if the trait is in scope
-help: the following trait is implemented but not in scope, perhaps add a `use` for it:
+help: the following trait is implemented but not in scope; perhaps add a `use` for it:
    |
 LL | use method::B;
    |
@@ -96,7 +96,7 @@ LL |     S::B;
    |        ^ associated item not found in `S`
    |
    = help: items from traits can only be used if the trait is in scope
-help: the following trait is implemented but not in scope, perhaps add a `use` for it:
+help: the following trait is implemented but not in scope; perhaps add a `use` for it:
    |
 LL | use assoc_const::B;
    |

src/test/ui/traits/trait-method-private.stderr

@@ -5,7 +5,7 @@ LL |     foo.method();
    |         ^^^^^^
    |
    = help: items from traits can only be used if the trait is in scope
-help: the following trait is implemented but not in scope, perhaps add a `use` for it:
+help: the following trait is implemented but not in scope; perhaps add a `use` for it:
    |
 LL | use inner::Bar;
    |

src/test/ui/underscore-imports/shadow.stderr

@@ -5,7 +5,7 @@ LL |         x.deref();
    |           ^^^^^ method not found in `&()`
    |
    = help: items from traits can only be used if the trait is in scope
-   = note: the following trait is implemented but not in scope, perhaps add a `use` for it:
+   = note: the following trait is implemented but not in scope; perhaps add a `use` for it:
            `use std::ops::Deref;`
 
 error: aborting due to previous error