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Remove blanket silencing of "type annotation needed" errors 

Remove blanket check for existence of other errors before emitting
"type annotation needed" errors, and add some eager checks to avoid
adding obligations when they refer to types that reference
`[type error]` in order to reduce unneded errors.
This commit is contained in:
Esteban Küber 2019-09-24 11:05:49 -07:00
parent 6ef275e6c3
commit d9ab4ff9a3
50 changed files with 262 additions and 166 deletions
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4
src/librustc/hir/lowering.rs
View File

@ -2184,9 +2184,7 @@ impl<'a> LoweringContext<'a> {
match decl.output {
FunctionRetTy::Ty(ref ty) => match in_band_ty_params {
Some((def_id, _)) if impl_trait_return_allow => {
hir::Return(self.lower_ty(ty,
ImplTraitContext::OpaqueTy(Some(def_id))
))
hir::Return(self.lower_ty(ty, ImplTraitContext::OpaqueTy(Some(def_id))))
}
_ => {
hir::Return(self.lower_ty(ty, ImplTraitContext::disallowed()))

13
src/librustc/infer/opaque_types/mod.rs
View File

@ -988,7 +988,9 @@ impl<'a, 'tcx> Instantiator<'a, 'tcx> {
value.fold_with(&mut BottomUpFolder {
tcx,
ty_op: |ty| {
if let ty::Opaque(def_id, substs) = ty.sty {
if ty.references_error() {
return tcx.types.err;
} else if let ty::Opaque(def_id, substs) = ty.sty {
// Check that this is `impl Trait` type is
// declared by `parent_def_id` -- i.e., one whose
// value we are inferring. At present, this is
@ -1155,6 +1157,15 @@ impl<'a, 'tcx> Instantiator<'a, 'tcx> {
);
debug!("instantiate_opaque_types: ty_var={:?}", ty_var);
for predicate in &bounds.predicates {
if let ty::Predicate::Projection(projection) = &predicate {
if projection.skip_binder().ty.references_error() {
// No point on adding these obligations since there's a type error involved.
return ty_var;
}
}
}
self.obligations.reserve(bounds.predicates.len());
for predicate in bounds.predicates {
// Change the predicate to refer to the type variable,

71
src/librustc/traits/error_reporting.rs
View File

@ -1432,8 +1432,11 @@ impl<'tcx> TyCtxt<'tcx> {
}
impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
fn maybe_report_ambiguity(&self, obligation: &PredicateObligation<'tcx>,
body_id: Option<hir::BodyId>) {
fn maybe_report_ambiguity(
&self,
obligation: &PredicateObligation<'tcx>,
body_id: Option<hir::BodyId>,
) {
// Unable to successfully determine, probably means
// insufficient type information, but could mean
// ambiguous impls. The latter *ought* to be a
@ -1442,9 +1445,13 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
let predicate = self.resolve_vars_if_possible(&obligation.predicate);
let span = obligation.cause.span;
debug!("maybe_report_ambiguity(predicate={:?}, obligation={:?})",
predicate,
obligation);
debug!(
"maybe_report_ambiguity(predicate={:?}, obligation={:?} body_id={:?}, code={:?})",
predicate,
obligation,
body_id,
obligation.cause.code,
);
// Ambiguity errors are often caused as fallout from earlier
// errors. So just ignore them if this infcx is tainted.
@ -1456,6 +1463,8 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
ty::Predicate::Trait(ref data) => {
let trait_ref = data.to_poly_trait_ref();
let self_ty = trait_ref.self_ty();
debug!("self_ty {:?} {:?} trait_ref {:?}", self_ty, self_ty.sty, trait_ref);
if predicate.references_error() {
return;
}
@ -1480,24 +1489,25 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
// be ignoring the fact that we don't KNOW the type works
// out. Though even that would probably be harmless, given that
// we're only talking about builtin traits, which are known to be
// inhabited. But in any case I just threw in this check for
// has_errors() to be sure that compilation isn't happening
// anyway. In that case, why inundate the user.
if !self.tcx.sess.has_errors() {
if
self.tcx.lang_items().sized_trait()
.map_or(false, |sized_id| sized_id == trait_ref.def_id())
{
self.need_type_info_err(body_id, span, self_ty).emit();
} else {
let mut err = struct_span_err!(self.tcx.sess,
span, E0283,
"type annotations required: \
cannot resolve `{}`",
predicate);
self.note_obligation_cause(&mut err, obligation);
err.emit();
}
// inhabited. We used to check for `self.tcx.sess.has_errors()` to
// avoid inundating the user with unnecessary errors, but we now
// check upstream for type errors and dont add the obligations to
// begin with in those cases.
if
self.tcx.lang_items().sized_trait()
.map_or(false, |sized_id| sized_id == trait_ref.def_id())
{
self.need_type_info_err(body_id, span, self_ty).emit();
} else {
let mut err = struct_span_err!(
self.tcx.sess,
span,
E0283,
"type annotations needed: cannot resolve `{}`",
predicate,
);
self.note_obligation_cause(&mut err, obligation);
err.emit();
}
}
@ -1524,11 +1534,13 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
_ => {
if !self.tcx.sess.has_errors() {
let mut err = struct_span_err!(self.tcx.sess,
obligation.cause.span, E0284,
"type annotations required: \
cannot resolve `{}`",
predicate);
let mut err = struct_span_err!(
self.tcx.sess,
obligation.cause.span,
E0284,
"type annotations needed: cannot resolve `{}`",
predicate,
);
self.note_obligation_cause(&mut err, obligation);
err.emit();
}
@ -1766,7 +1778,8 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
but not on the corresponding trait method",
predicate));
}
ObligationCauseCode::ReturnType(_) |
ObligationCauseCode::ReturnType |
ObligationCauseCode::ReturnValue(_) |
ObligationCauseCode::BlockTailExpression(_) => (),
ObligationCauseCode::TrivialBound => {
err.help("see issue #48214");

13
src/librustc/traits/mod.rs
View File

@ -212,14 +212,14 @@ pub enum ObligationCauseCode<'tcx> {
/// Constant expressions must be sized.
ConstSized,
/// static items must have `Sync` type
/// Static items must have `Sync` type
SharedStatic,
BuiltinDerivedObligation(DerivedObligationCause<'tcx>),
ImplDerivedObligation(DerivedObligationCause<'tcx>),
/// error derived when matching traits/impls; see ObligationCause for more details
/// Error derived when matching traits/impls; see ObligationCause for more details
CompareImplMethodObligation {
item_name: ast::Name,
impl_item_def_id: DefId,
@ -248,17 +248,20 @@ pub enum ObligationCauseCode<'tcx> {
/// `start` has wrong type
StartFunctionType,
/// intrinsic has wrong type
/// Intrinsic has wrong type
IntrinsicType,
/// method receiver
/// Method receiver
MethodReceiver,
/// `return` with no expression
ReturnNoExpression,
/// `return` with an expression
ReturnType(hir::HirId),
ReturnValue(hir::HirId),
/// Return type of this function
ReturnType,
/// Block implicit return
BlockTailExpression(hir::HirId),

2
src/librustc/traits/select.rs
View File

@ -214,7 +214,7 @@ pub struct SelectionCache<'tcx> {
/// of type variables - it just means the obligation isn't sufficiently
/// elaborated. In that case we report an ambiguity, and the caller can
/// try again after more type information has been gathered or report a
/// "type annotations required" error.
/// "type annotations needed" error.
///
/// However, with type parameters, this can be a real problem - type
/// parameters don't unify with regular types, but they *can* unify

3
src/librustc/traits/structural_impls.rs
View File

@ -485,7 +485,8 @@ impl<'a, 'tcx> Lift<'tcx> for traits::ObligationCauseCode<'a> {
super::TupleInitializerSized => Some(super::TupleInitializerSized),
super::StructInitializerSized => Some(super::StructInitializerSized),
super::VariableType(id) => Some(super::VariableType(id)),
super::ReturnType(id) => Some(super::ReturnType(id)),
super::ReturnValue(id) => Some(super::ReturnValue(id)),
super::ReturnType => Some(super::ReturnType),
super::SizedArgumentType => Some(super::SizedArgumentType),
super::SizedReturnType => Some(super::SizedReturnType),
super::SizedYieldType => Some(super::SizedYieldType),

6
src/librustc/ty/mod.rs
View File

@ -438,7 +438,7 @@ bitflags! {
/// `true` if there are "names" of types and regions and so forth
/// that are local to a particular fn
const HAS_FREE_LOCAL_NAMES = 1 << 9;
const HAS_FREE_LOCAL_NAMES = 1 << 9;
/// Present if the type belongs in a local type context.
/// Only set for Infer other than Fresh.
@ -446,11 +446,11 @@ bitflags! {
/// Does this have any `ReLateBound` regions? Used to check
/// if a global bound is safe to evaluate.
const HAS_RE_LATE_BOUND = 1 << 11;
const HAS_RE_LATE_BOUND = 1 << 11;
const HAS_TY_PLACEHOLDER = 1 << 12;
const HAS_CT_INFER = 1 << 13;
const HAS_CT_INFER = 1 << 13;
const HAS_CT_PLACEHOLDER = 1 << 14;
const NEEDS_SUBST = TypeFlags::HAS_PARAMS.bits |

2
src/librustc_typeck/check/coercion.rs
View File

@ -1253,7 +1253,7 @@ impl<'tcx, 'exprs, E: AsCoercionSite> CoerceMany<'tcx, 'exprs, E> {
expression.map(|expr| (expr, blk_id)),
);
}
ObligationCauseCode::ReturnType(id) => {
ObligationCauseCode::ReturnValue(id) => {
db = self.report_return_mismatched_types(
cause, expected, found, err, fcx, id, None);
}

16
src/librustc_typeck/check/expr.rs
View File

@ -498,7 +498,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
expr.span,
infer::LateBoundRegionConversionTime::FnCall,
&fn_sig.output()).0;
self.require_type_is_sized_deferred(output, expr.span, traits::SizedReturnType);
if !fn_sig.output().references_error() {
self.require_type_is_sized_deferred(output, expr.span, traits::SizedReturnType);
}
}
// We always require that the type provided as the value for
@ -664,12 +666,12 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
let ret_ty = ret_coercion.borrow().expected_ty();
let return_expr_ty = self.check_expr_with_hint(return_expr, ret_ty.clone());
ret_coercion.borrow_mut()
.coerce(self,
&self.cause(return_expr.span,
ObligationCauseCode::ReturnType(return_expr.hir_id)),
return_expr,
return_expr_ty);
ret_coercion.borrow_mut().coerce(
self,
&self.cause(return_expr.span, ObligationCauseCode::ReturnValue(return_expr.hir_id)),
return_expr,
return_expr_ty,
);
}
/// Type check assignment expression `expr` of form `lhs = rhs`.

4
src/librustc_typeck/check/mod.rs
View File

@ -1097,7 +1097,9 @@ fn check_fn<'a, 'tcx>(
*fcx.ps.borrow_mut() = UnsafetyState::function(fn_sig.unsafety, fn_id);
let declared_ret_ty = fn_sig.output();
fcx.require_type_is_sized(declared_ret_ty, decl.output.span(), traits::SizedReturnType);
if !declared_ret_ty.references_error() {
fcx.require_type_is_sized(declared_ret_ty, decl.output.span(), traits::SizedReturnType);
}
let revealed_ret_ty = fcx.instantiate_opaque_types_from_value(
fn_id,
&declared_ret_ty,

2
src/librustc_typeck/check/wfcheck.rs
View File

@ -596,7 +596,7 @@ fn check_fn_or_method<'fcx, 'tcx>(
}
implied_bounds.extend(sig.inputs());
fcx.register_wf_obligation(sig.output(), span, ObligationCauseCode::MiscObligation);
fcx.register_wf_obligation(sig.output(), span, ObligationCauseCode::ReturnType);
// FIXME(#25759) return types should not be implied bounds
implied_bounds.push(sig.output());

4
src/test/ui/associated-types/associated-types-overridden-binding.rs
View File

@ -1,10 +1,10 @@
#![feature(trait_alias)]
trait Foo: Iterator<Item = i32> {}
trait Bar: Foo<Item = u32> {} //~ ERROR type annotations required
trait Bar: Foo<Item = u32> {} //~ ERROR type annotations needed
trait I32Iterator = Iterator<Item = i32>;
trait U32Iterator = I32Iterator<Item = u32>;
trait U32Iterator = I32Iterator<Item = u32>; //~ ERROR type annotations needed
fn main() {
let _: &dyn I32Iterator<Item = u32>;

13
src/test/ui/associated-types/associated-types-overridden-binding.stderr
View File

@ -1,4 +1,4 @@
error[E0284]: type annotations required: cannot resolve `<Self as std::iter::Iterator>::Item == i32`
error[E0284]: type annotations needed: cannot resolve `<Self as std::iter::Iterator>::Item == i32`
--> $DIR/associated-types-overridden-binding.rs:4:1
|
LL | trait Foo: Iterator<Item = i32> {}
@ -6,6 +6,13 @@ LL | trait Foo: Iterator<Item = i32> {}
LL | trait Bar: Foo<Item = u32> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to previous error
error[E0282]: type annotations needed
--> $DIR/associated-types-overridden-binding.rs:7:1
|
LL | trait U32Iterator = I32Iterator<Item = u32>;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type
For more information about this error, try `rustc --explain E0284`.
error: aborting due to 2 previous errors
Some errors have detailed explanations: E0282, E0284.
For more information about an error, try `rustc --explain E0282`.

2
src/test/ui/associated-types/associated-types-unconstrained.rs
View File

@ -12,5 +12,5 @@ impl Foo for isize {
pub fn main() {
let x: isize = Foo::bar();
//~^ ERROR type annotations required
//~^ ERROR type annotations needed
}

2
src/test/ui/associated-types/associated-types-unconstrained.stderr
View File

@ -1,4 +1,4 @@
error[E0284]: type annotations required: cannot resolve `<_ as Foo>::A == _`
error[E0284]: type annotations needed: cannot resolve `<_ as Foo>::A == _`
--> $DIR/associated-types-unconstrained.rs:14:20
|
LL | let x: isize = Foo::bar();

2
src/test/ui/error-codes/E0283.stderr
View File

@ -1,4 +1,4 @@
error[E0283]: type annotations required: cannot resolve `_: Generator`
error[E0283]: type annotations needed: cannot resolve `_: Generator`
--> $DIR/E0283.rs:18:21
|
LL | fn create() -> u32;

2
src/test/ui/error-codes/E0401.rs
View File

@ -8,7 +8,7 @@ fn foo<T>(x: T) {
W: Fn()>
(y: T) { //~ ERROR E0401
}
bfnr(x);
bfnr(x); //~ ERROR type annotations needed
}

11
src/test/ui/error-codes/E0401.stderr
View File

@ -32,6 +32,13 @@ LL | fn helper(sel: &Self) -> u8 {
| use of generic parameter from outer function
| use a type here instead
error: aborting due to 3 previous errors
error[E0282]: type annotations needed
--> $DIR/E0401.rs:11:5
|
LL | bfnr(x);
| ^^^^ cannot infer type for `U`
For more information about this error, try `rustc --explain E0401`.
error: aborting due to 4 previous errors
Some errors have detailed explanations: E0282, E0401.
For more information about an error, try `rustc --explain E0282`.

2
src/test/ui/error-codes/E0661.rs
View File

@ -3,7 +3,7 @@
#![feature(asm)]
fn main() {
let a;
let a; //~ ERROR type annotations needed
asm!("nop" : "r"(a));
//~^ ERROR E0661
}

9
src/test/ui/error-codes/E0661.stderr
View File

@ -4,5 +4,12 @@ error[E0661]: output operand constraint lacks '=' or '+'
LL | asm!("nop" : "r"(a));
| ^^^
error: aborting due to previous error
error[E0282]: type annotations needed
--> $DIR/E0661.rs:6:9
|
LL | let a;
| ^ consider giving `a` a type
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0282`.

6
src/test/ui/impl-trait/where-allowed.rs
View File

@ -11,8 +11,9 @@ fn in_return() -> impl Debug { panic!() }
// Allowed
fn in_adt_in_parameters(_: Vec<impl Debug>) { panic!() }
// Allowed
// Disallowed
fn in_adt_in_return() -> Vec<impl Debug> { panic!() }
//~^ ERROR type annotations needed
// Disallowed
fn in_fn_parameter_in_parameters(_: fn(impl Debug)) { panic!() }
@ -58,7 +59,8 @@ fn in_impl_Fn_return_in_parameters(_: &impl Fn() -> impl Debug) { panic!() }
// Disallowed
fn in_impl_Fn_parameter_in_return() -> &'static impl Fn(impl Debug) { panic!() }
//~^ ERROR `impl Trait` not allowed outside of function and inherent method return types
//~^^ ERROR nested `impl Trait` is not allowed
//~| ERROR nested `impl Trait` is not allowed
//~| ERROR type annotations needed
// Disallowed
fn in_impl_Fn_return_in_return() -> &'static impl Fn() -> impl Debug { panic!() }

100
src/test/ui/impl-trait/where-allowed.stderr
View File

@ -1,5 +1,5 @@
error[E0666]: nested `impl Trait` is not allowed
--> $DIR/where-allowed.rs:50:51
--> $DIR/where-allowed.rs:51:51
|
LL | fn in_impl_Fn_parameter_in_parameters(_: &impl Fn(impl Debug)) { panic!() }
| --------^^^^^^^^^^-
@ -8,7 +8,7 @@ LL | fn in_impl_Fn_parameter_in_parameters(_: &impl Fn(impl Debug)) { panic!() }
| outer `impl Trait`
error[E0666]: nested `impl Trait` is not allowed
--> $DIR/where-allowed.rs:59:57
--> $DIR/where-allowed.rs:60:57
|
LL | fn in_impl_Fn_parameter_in_return() -> &'static impl Fn(impl Debug) { panic!() }
| --------^^^^^^^^^^-
@ -17,7 +17,7 @@ LL | fn in_impl_Fn_parameter_in_return() -> &'static impl Fn(impl Debug) { panic
| outer `impl Trait`
error[E0658]: `impl Trait` in type aliases is unstable
--> $DIR/where-allowed.rs:122:5
--> $DIR/where-allowed.rs:124:5
|
LL | type Out = impl Debug;
| ^^^^^^^^^^^^^^^^^^^^^^
@ -26,7 +26,7 @@ LL | type Out = impl Debug;
= help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
error[E0658]: `impl Trait` in type aliases is unstable
--> $DIR/where-allowed.rs:158:1
--> $DIR/where-allowed.rs:160:1
|
LL | type InTypeAlias<R> = impl Debug;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@ -35,205 +35,205 @@ LL | type InTypeAlias<R> = impl Debug;
= help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:18:40
--> $DIR/where-allowed.rs:19:40
|
LL | fn in_fn_parameter_in_parameters(_: fn(impl Debug)) { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:22:42
--> $DIR/where-allowed.rs:23:42
|
LL | fn in_fn_return_in_parameters(_: fn() -> impl Debug) { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:26:38
--> $DIR/where-allowed.rs:27:38
|
LL | fn in_fn_parameter_in_return() -> fn(impl Debug) { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:30:40
--> $DIR/where-allowed.rs:31:40
|
LL | fn in_fn_return_in_return() -> fn() -> impl Debug { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:34:49
--> $DIR/where-allowed.rs:35:49
|
LL | fn in_dyn_Fn_parameter_in_parameters(_: &dyn Fn(impl Debug)) { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:38:51
--> $DIR/where-allowed.rs:39:51
|
LL | fn in_dyn_Fn_return_in_parameters(_: &dyn Fn() -> impl Debug) { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:42:55
--> $DIR/where-allowed.rs:43:55
|
LL | fn in_dyn_Fn_parameter_in_return() -> &'static dyn Fn(impl Debug) { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:46:57
--> $DIR/where-allowed.rs:47:57
|
LL | fn in_dyn_Fn_return_in_return() -> &'static dyn Fn() -> impl Debug { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:50:51
--> $DIR/where-allowed.rs:51:51
|
LL | fn in_impl_Fn_parameter_in_parameters(_: &impl Fn(impl Debug)) { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:55:53
--> $DIR/where-allowed.rs:56:53
|
LL | fn in_impl_Fn_return_in_parameters(_: &impl Fn() -> impl Debug) { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:59:57
--> $DIR/where-allowed.rs:60:57
|
LL | fn in_impl_Fn_parameter_in_return() -> &'static impl Fn(impl Debug) { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:64:59
--> $DIR/where-allowed.rs:66:59
|
LL | fn in_impl_Fn_return_in_return() -> &'static impl Fn() -> impl Debug { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:68:38
--> $DIR/where-allowed.rs:70:38
|
LL | fn in_Fn_parameter_in_generics<F: Fn(impl Debug)> (_: F) { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:72:40
--> $DIR/where-allowed.rs:74:40
|
LL | fn in_Fn_return_in_generics<F: Fn() -> impl Debug> (_: F) { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:85:32
--> $DIR/where-allowed.rs:87:32
|
LL | struct InBraceStructField { x: impl Debug }
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:89:41
--> $DIR/where-allowed.rs:91:41
|
LL | struct InAdtInBraceStructField { x: Vec<impl Debug> }
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:93:27
--> $DIR/where-allowed.rs:95:27
|
LL | struct InTupleStructField(impl Debug);
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:98:25
--> $DIR/where-allowed.rs:100:25
|
LL | InBraceVariant { x: impl Debug },
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:100:20
--> $DIR/where-allowed.rs:102:20
|
LL | InTupleVariant(impl Debug),
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:111:23
--> $DIR/where-allowed.rs:113:23
|
LL | fn in_return() -> impl Debug;
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:129:34
--> $DIR/where-allowed.rs:131:34
|
LL | fn in_trait_impl_return() -> impl Debug { () }
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:142:33
--> $DIR/where-allowed.rs:144:33
|
LL | fn in_foreign_parameters(_: impl Debug);
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:145:31
--> $DIR/where-allowed.rs:147:31
|
LL | fn in_foreign_return() -> impl Debug;
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:162:39
--> $DIR/where-allowed.rs:164:39
|
LL | type InReturnInTypeAlias<R> = fn() -> impl Debug;
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:166:16
--> $DIR/where-allowed.rs:168:16
|
LL | impl PartialEq<impl Debug> for () {
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:171:24
--> $DIR/where-allowed.rs:173:24
|
LL | impl PartialEq<()> for impl Debug {
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:176:6
--> $DIR/where-allowed.rs:178:6
|
LL | impl impl Debug {
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:182:24
--> $DIR/where-allowed.rs:184:24
|
LL | impl InInherentImplAdt<impl Debug> {
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:188:11
--> $DIR/where-allowed.rs:190:11
|
LL | where impl Debug: Debug
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:195:15
--> $DIR/where-allowed.rs:197:15
|
LL | where Vec<impl Debug>: Debug
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:202:24
--> $DIR/where-allowed.rs:204:24
|
LL | where T: PartialEq<impl Debug>
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:209:17
--> $DIR/where-allowed.rs:211:17
|
LL | where T: Fn(impl Debug)
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:216:22
--> $DIR/where-allowed.rs:218:22
|
LL | where T: Fn() -> impl Debug
| ^^^^^^^^^^
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:222:29
--> $DIR/where-allowed.rs:224:29
|
LL | let _in_local_variable: impl Fn() = || {};
| ^^^^^^^^^
@ -241,24 +241,36 @@ LL | let _in_local_variable: impl Fn() = || {};
= help: add `#![feature(impl_trait_in_bindings)]` to the crate attributes to enable
error[E0562]: `impl Trait` not allowed outside of function and inherent method return types
--> $DIR/where-allowed.rs:224:46
--> $DIR/where-allowed.rs:226:46
|
LL | let _in_return_in_local_variable = || -> impl Fn() { || {} };
| ^^^^^^^^^
error[E0282]: type annotations needed
--> $DIR/where-allowed.rs:15:30
|
LL | fn in_adt_in_return() -> Vec<impl Debug> { panic!() }
| ^^^^^^^^^^ cannot infer type
error[E0282]: type annotations needed
--> $DIR/where-allowed.rs:60:49
|
LL | fn in_impl_Fn_parameter_in_return() -> &'static impl Fn(impl Debug) { panic!() }
| ^^^^^^^^^^^^^^^^^^^ cannot infer type
error: could not find defining uses
--> $DIR/where-allowed.rs:158:1
--> $DIR/where-allowed.rs:160:1
|
LL | type InTypeAlias<R> = impl Debug;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: could not find defining uses
--> $DIR/where-allowed.rs:122:5
--> $DIR/where-allowed.rs:124:5
|
LL | type Out = impl Debug;
| ^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to 41 previous errors
error: aborting due to 43 previous errors
Some errors have detailed explanations: E0562, E0658.
For more information about an error, try `rustc --explain E0562`.
Some errors have detailed explanations: E0282, E0562, E0658.
For more information about an error, try `rustc --explain E0282`.

2
src/test/ui/issues/issue-12028.rs
View File

@ -24,7 +24,7 @@ trait StreamHash<H: StreamHasher>: Hash<H> {
impl<H: StreamHasher> Hash<H> for u8 {
fn hash2(&self, hasher: &H) -> u64 {
let mut stream = hasher.stream();
self.input_stream(&mut stream); //~ ERROR type annotations required
self.input_stream(&mut stream); //~ ERROR type annotations needed
Stream::result(&stream)
}
}

2
src/test/ui/issues/issue-12028.stderr
View File

@ -1,4 +1,4 @@
error[E0284]: type annotations required: cannot resolve `<_ as StreamHasher>::S == <H as StreamHasher>::S`
error[E0284]: type annotations needed: cannot resolve `<_ as StreamHasher>::S == <H as StreamHasher>::S`
--> $DIR/issue-12028.rs:27:14
|
LL | self.input_stream(&mut stream);

2
src/test/ui/issues/issue-21974.rs
View File

@ -7,7 +7,7 @@ trait Foo {
fn foo(self);
}
fn foo<'a,'b,T>(x: &'a T, y: &'b T) //~ ERROR type annotations required
fn foo<'a,'b,T>(x: &'a T, y: &'b T) //~ ERROR type annotations needed
where &'a T : Foo,
&'b T : Foo
{

2
src/test/ui/issues/issue-21974.stderr
View File

@ -1,4 +1,4 @@
error[E0283]: type annotations required: cannot resolve `&'a T: Foo`
error[E0283]: type annotations needed: cannot resolve `&'a T: Foo`
--> $DIR/issue-21974.rs:10:1
|
LL | trait Foo {

2
src/test/ui/issues/issue-24424.rs
View File

@ -2,6 +2,6 @@ trait Trait1<'l0, T0> {}
trait Trait0<'l0> {}
impl <'l0, 'l1, T0> Trait1<'l0, T0> for bool where T0 : Trait0<'l0>, T0 : Trait0<'l1> {}
//~^ ERROR type annotations required: cannot resolve `T0: Trait0<'l0>`
//~^ ERROR type annotations needed: cannot resolve `T0: Trait0<'l0>`
fn main() {}

2
src/test/ui/issues/issue-24424.stderr
View File

@ -1,4 +1,4 @@
error[E0283]: type annotations required: cannot resolve `T0: Trait0<'l0>`
error[E0283]: type annotations needed: cannot resolve `T0: Trait0<'l0>`
--> $DIR/issue-24424.rs:4:1
|
LL | trait Trait0<'l0> {}

2
src/test/ui/issues/issue-29147.stderr
View File

@ -1,4 +1,4 @@
error[E0283]: type annotations required: cannot resolve `S5<_>: Foo`
error[E0283]: type annotations needed: cannot resolve `S5<_>: Foo`
--> $DIR/issue-29147.rs:21:13
|
LL | trait Foo { fn xxx(&self); }

4
src/test/ui/issues/issue-54954.rs
View File

@ -1,7 +1,7 @@
#![feature(const_fn)]
const ARR_LEN: usize = Tt::const_val::<[i8; 123]>();
//~^ ERROR constant contains unimplemented expression type
//~^ ERROR type annotations needed
trait Tt {
const fn const_val<T: Sized>() -> usize {
@ -11,6 +11,8 @@ trait Tt {
}
fn f(z: [f32; ARR_LEN]) -> [f32; ARR_LEN] {
//~^ ERROR evaluation of constant value failed
//~| ERROR evaluation of constant value failed
z
}

25
src/test/ui/issues/issue-54954.stderr
View File

@ -4,13 +4,28 @@ error[E0379]: trait fns cannot be declared const
LL | const fn const_val<T: Sized>() -> usize {
| ^^^^^ trait fns cannot be const
error[E0019]: constant contains unimplemented expression type
error[E0283]: type annotations needed: cannot resolve `_: Tt`
--> $DIR/issue-54954.rs:3:24
|
LL | const ARR_LEN: usize = Tt::const_val::<[i8; 123]>();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
...
LL | const fn const_val<T: Sized>() -> usize {
| --------------------------------------- required by `Tt::const_val`
error: aborting due to 2 previous errors
error[E0080]: evaluation of constant value failed
--> $DIR/issue-54954.rs:13:15
|
LL | fn f(z: [f32; ARR_LEN]) -> [f32; ARR_LEN] {
| ^^^^^^^ referenced constant has errors
Some errors have detailed explanations: E0019, E0379.
For more information about an error, try `rustc --explain E0019`.
error[E0080]: evaluation of constant value failed
--> $DIR/issue-54954.rs:13:34
|
LL | fn f(z: [f32; ARR_LEN]) -> [f32; ARR_LEN] {
| ^^^^^^^ referenced constant has errors
error: aborting due to 4 previous errors
Some errors have detailed explanations: E0080, E0283, E0379.
For more information about an error, try `rustc --explain E0080`.

2
src/test/ui/methods/method-ambig-one-trait-unknown-int-type.rs
View File

@ -15,7 +15,7 @@ impl Foo for Vec<isize> {
}
// This is very hokey: we have heuristics to suppress messages about
// type annotations required. But placing these two bits of code into
// type annotations needed. But placing these two bits of code into
// distinct functions, in this order, causes us to print out both
// errors I'd like to see.

2
src/test/ui/parser/raw/raw-literal-self.rs
View File

@ -1,4 +1,4 @@
fn main() {
let r#self;
let r#self: ();
//~^ ERROR `self` cannot be a raw identifier
}

2
src/test/ui/parser/raw/raw-literal-self.stderr
View File

@ -1,7 +1,7 @@
error: `self` cannot be a raw identifier
--> $DIR/raw-literal-self.rs:2:9
|
LL | let r#self;
LL | let r#self: ();
| ^^^^^^
error: aborting due to previous error

2
src/test/ui/parser/raw/raw-literal-underscore.rs
View File

@ -1,4 +1,4 @@
fn main() {
let r#_;
let r#_: ();
//~^ ERROR `_` cannot be a raw identifier
}

2
src/test/ui/parser/raw/raw-literal-underscore.stderr
View File

@ -1,7 +1,7 @@
error: `_` cannot be a raw identifier
--> $DIR/raw-literal-underscore.rs:2:9
|
LL | let r#_;
LL | let r#_: ();
| ^^^
error: aborting due to previous error

1
src/test/ui/pattern/rest-pat-semantic-disallowed.rs
View File

@ -31,6 +31,7 @@ fn rest_patterns() {
// Ident patterns:
let x @ ..; //~ ERROR `..` patterns are not allowed here
//~^ ERROR type annotations needed
let ref x @ ..; //~ ERROR `..` patterns are not allowed here
let ref mut x @ ..; //~ ERROR `..` patterns are not allowed here

49
src/test/ui/pattern/rest-pat-semantic-disallowed.stderr
View File

@ -58,7 +58,7 @@ LL | let x @ ..;
= note: only allowed in tuple, tuple struct, and slice patterns
error: `..` patterns are not allowed here
--> $DIR/rest-pat-semantic-disallowed.rs:34:17
--> $DIR/rest-pat-semantic-disallowed.rs:35:17
|
LL | let ref x @ ..;
| ^^
@ -66,7 +66,7 @@ LL | let ref x @ ..;
= note: only allowed in tuple, tuple struct, and slice patterns
error: `..` patterns are not allowed here
--> $DIR/rest-pat-semantic-disallowed.rs:35:21
--> $DIR/rest-pat-semantic-disallowed.rs:36:21
|
LL | let ref mut x @ ..;
| ^^
@ -74,7 +74,7 @@ LL | let ref mut x @ ..;
= note: only allowed in tuple, tuple struct, and slice patterns
error: `..` can only be used once per tuple pattern
--> $DIR/rest-pat-semantic-disallowed.rs:42:9
--> $DIR/rest-pat-semantic-disallowed.rs:43:9
|
LL | ..,
| -- previously used here
@ -82,7 +82,7 @@ LL | ..,
| ^^ can only be used once per tuple pattern
error: `..` can only be used once per tuple pattern
--> $DIR/rest-pat-semantic-disallowed.rs:43:9
--> $DIR/rest-pat-semantic-disallowed.rs:44:9
|
LL | ..,
| -- previously used here
@ -91,7 +91,7 @@ LL | ..
| ^^ can only be used once per tuple pattern
error: `..` can only be used once per tuple pattern
--> $DIR/rest-pat-semantic-disallowed.rs:48:9
--> $DIR/rest-pat-semantic-disallowed.rs:49:9
|
LL | ..,
| -- previously used here
@ -99,25 +99,25 @@ LL | x,
LL | ..
| ^^ can only be used once per tuple pattern
error: `..` can only be used once per tuple struct pattern
--> $DIR/rest-pat-semantic-disallowed.rs:58:9
|
LL | ..,
| -- previously used here
LL | ..,
| ^^ can only be used once per tuple struct pattern
error: `..` can only be used once per tuple struct pattern
--> $DIR/rest-pat-semantic-disallowed.rs:59:9
|
LL | ..,
| -- previously used here
LL | ..,
| ^^ can only be used once per tuple struct pattern
error: `..` can only be used once per tuple struct pattern
--> $DIR/rest-pat-semantic-disallowed.rs:60:9
|
LL | ..,
| -- previously used here
LL | ..,
LL | ..
| ^^ can only be used once per tuple struct pattern
error: `..` can only be used once per tuple struct pattern
--> $DIR/rest-pat-semantic-disallowed.rs:64:9
--> $DIR/rest-pat-semantic-disallowed.rs:65:9
|
LL | ..,
| -- previously used here
@ -126,7 +126,7 @@ LL | ..
| ^^ can only be used once per tuple struct pattern
error: `..` can only be used once per slice pattern
--> $DIR/rest-pat-semantic-disallowed.rs:72:9
--> $DIR/rest-pat-semantic-disallowed.rs:73:9
|
LL | ..,
| -- previously used here
@ -134,7 +134,7 @@ LL | ..,
| ^^ can only be used once per slice pattern
error: `..` can only be used once per slice pattern
--> $DIR/rest-pat-semantic-disallowed.rs:73:9
--> $DIR/rest-pat-semantic-disallowed.rs:74:9
|
LL | ..,
| -- previously used here
@ -143,7 +143,7 @@ LL | ..
| ^^ can only be used once per slice pattern
error: `..` can only be used once per slice pattern
--> $DIR/rest-pat-semantic-disallowed.rs:77:17
--> $DIR/rest-pat-semantic-disallowed.rs:78:17
|
LL | ..,
| -- previously used here
@ -151,7 +151,7 @@ LL | ref x @ ..,
| ^^ can only be used once per slice pattern
error: `..` can only be used once per slice pattern
--> $DIR/rest-pat-semantic-disallowed.rs:78:21
--> $DIR/rest-pat-semantic-disallowed.rs:79:21
|
LL | ..,
| -- previously used here
@ -160,7 +160,7 @@ LL | ref mut y @ ..,
| ^^ can only be used once per slice pattern
error: `..` patterns are not allowed here
--> $DIR/rest-pat-semantic-disallowed.rs:79:18
--> $DIR/rest-pat-semantic-disallowed.rs:80:18
|
LL | (ref z @ ..),
| ^^
@ -168,7 +168,7 @@ LL | (ref z @ ..),
= note: only allowed in tuple, tuple struct, and slice patterns
error: `..` can only be used once per slice pattern
--> $DIR/rest-pat-semantic-disallowed.rs:80:9
--> $DIR/rest-pat-semantic-disallowed.rs:81:9
|
LL | ..,
| -- previously used here
@ -184,5 +184,12 @@ LL | fn foo(..: u8) {}
|
= note: only allowed in tuple, tuple struct, and slice patterns
error: aborting due to 22 previous errors
error[E0282]: type annotations needed
--> $DIR/rest-pat-semantic-disallowed.rs:33:9
|
LL | let x @ ..;
| ^^^^^^ consider giving this pattern a type
error: aborting due to 23 previous errors
For more information about this error, try `rustc --explain E0282`.

2
src/test/ui/question-mark-type-infer.rs
View File

@ -9,7 +9,7 @@ fn f(x: &i32) -> Result<i32, ()> {
fn g() -> Result<Vec<i32>, ()> {
let l = [1, 2, 3, 4];
l.iter().map(f).collect()? //~ ERROR type annotations required: cannot resolve
l.iter().map(f).collect()? //~ ERROR type annotations needed: cannot resolve
}
fn main() {

2
src/test/ui/question-mark-type-infer.stderr
View File

@ -1,4 +1,4 @@
error[E0284]: type annotations required: cannot resolve `<_ as std::ops::Try>::Ok == _`
error[E0284]: type annotations needed: cannot resolve `<_ as std::ops::Try>::Ok == _`
--> $DIR/question-mark-type-infer.rs:12:5
|
LL | l.iter().map(f).collect()?

2
src/test/ui/rfc-2565-param-attrs/proc-macro-cannot-be-used.rs
View File

@ -20,7 +20,7 @@ type Alias = extern "C" fn(#[id] u8, #[id] ...);
fn free(#[id] arg1: u8) {
//~^ ERROR expected an inert attribute, found an attribute macro
let lam = |#[id] W(x), #[id] y| ();
let lam = |#[id] W(x), #[id] y: usize| ();
//~^ ERROR expected an inert attribute, found an attribute macro
//~| ERROR expected an inert attribute, found an attribute macro
}

4
src/test/ui/rfc-2565-param-attrs/proc-macro-cannot-be-used.stderr
View File

@ -37,13 +37,13 @@ LL | fn free(#[id] arg1: u8) {
error: expected an inert attribute, found an attribute macro
--> $DIR/proc-macro-cannot-be-used.rs:23:16
|
LL | let lam = |#[id] W(x), #[id] y| ();
LL | let lam = |#[id] W(x), #[id] y: usize| ();
| ^^^^^
error: expected an inert attribute, found an attribute macro
--> $DIR/proc-macro-cannot-be-used.rs:23:28
|
LL | let lam = |#[id] W(x), #[id] y| ();
LL | let lam = |#[id] W(x), #[id] y: usize| ();
| ^^^^^
error: expected an inert attribute, found an attribute macro

2
src/test/ui/traits/trait-static-method-generic-inference.rs
View File

@ -22,7 +22,7 @@ mod base {
pub fn foo() {
let _f: base::Foo = base::HasNew::new();
//~^ ERROR type annotations required
//~^ ERROR type annotations needed
}
fn main() { }

2
src/test/ui/traits/trait-static-method-generic-inference.stderr
View File

@ -1,4 +1,4 @@
error[E0283]: type annotations required: cannot resolve `_: base::HasNew<base::Foo>`
error[E0283]: type annotations needed: cannot resolve `_: base::HasNew<base::Foo>`
--> $DIR/trait-static-method-generic-inference.rs:24:25
|
LL | fn new() -> T;

2
src/test/ui/type/type-annotation-needed.rs
View File

@ -4,5 +4,5 @@ fn foo<T: Into<String>>(x: i32) {}
fn main() {
foo(42);
//~^ ERROR type annotations required
//~^ ERROR type annotations needed
}

2
src/test/ui/type/type-annotation-needed.stderr
View File

@ -1,4 +1,4 @@
error[E0283]: type annotations required: cannot resolve `_: std::convert::Into<std::string::String>`
error[E0283]: type annotations needed: cannot resolve `_: std::convert::Into<std::string::String>`
--> $DIR/type-annotation-needed.rs:6:5
|
LL | fn foo<T: Into<String>>(x: i32) {}

2
src/test/ui/type/type-check/issue-40294.rs
View File

@ -2,7 +2,7 @@ trait Foo: Sized {
fn foo(self);
}
fn foo<'a,'b,T>(x: &'a T, y: &'b T) //~ ERROR type annotations required
fn foo<'a,'b,T>(x: &'a T, y: &'b T) //~ ERROR type annotations needed
where &'a T : Foo,
&'b T : Foo
{

2
src/test/ui/type/type-check/issue-40294.stderr
View File

@ -1,4 +1,4 @@
error[E0283]: type annotations required: cannot resolve `&'a T: Foo`
error[E0283]: type annotations needed: cannot resolve `&'a T: Foo`
--> $DIR/issue-40294.rs:5:1
|
LL | trait Foo: Sized {

2
src/test/ui/type/type-path-err-node-types.rs
View File

@ -20,7 +20,7 @@ fn method() {
}
fn closure() {
let _ = |a, b: _| -> _ { 0 }; // OK
let _ = |a, b: _| -> _ { 0 }; //~ ERROR type annotations needed
}
fn main() {}

12
src/test/ui/type/type-path-err-node-types.stderr
View File

@ -22,7 +22,13 @@ error[E0425]: cannot find value `nonexistent` in this scope
LL | nonexistent.nonexistent::<u8>();
| ^^^^^^^^^^^ not found in this scope
error: aborting due to 4 previous errors
error[E0282]: type annotations needed
--> $DIR/type-path-err-node-types.rs:23:14
|
LL | let _ = |a, b: _| -> _ { 0 };
| ^ consider giving this closure parameter a type
Some errors have detailed explanations: E0412, E0425, E0433.
For more information about an error, try `rustc --explain E0412`.
error: aborting due to 5 previous errors
Some errors have detailed explanations: E0282, E0412, E0425, E0433.
For more information about an error, try `rustc --explain E0282`.