From 84baf2f6f8eda07661ab956659839af9b61cc46b Mon Sep 17 00:00:00 2001 From: Michael Goulet Date: Mon, 19 Feb 2024 22:00:36 +0000 Subject: [PATCH] return ty::Error when equating ty::Error This helps iron out a difference between Sub and Equate --- .../rustc_infer/src/infer/relate/equate.rs | 5 ++ .../generic-associated-types/issue-79636-1.rs | 1 - .../issue-79636-1.stderr | 17 +--- tests/ui/impl-trait/where-allowed.rs | 1 - tests/ui/impl-trait/where-allowed.stderr | 86 +++++++++---------- ...mpl-trait-in-type-alias-with-bad-substs.rs | 1 - ...trait-in-type-alias-with-bad-substs.stderr | 10 +-- tests/ui/wf/issue-110157.rs | 3 +- tests/ui/wf/issue-110157.stderr | 25 +----- 9 files changed, 54 insertions(+), 95 deletions(-) diff --git a/compiler/rustc_infer/src/infer/relate/equate.rs b/compiler/rustc_infer/src/infer/relate/equate.rs index cb62f258373..61d1302d816 100644 --- a/compiler/rustc_infer/src/infer/relate/equate.rs +++ b/compiler/rustc_infer/src/infer/relate/equate.rs @@ -89,6 +89,11 @@ impl<'tcx> TypeRelation<'tcx> for Equate<'_, '_, 'tcx> { self.fields.instantiate(a, ty::Invariant, b_id, self.a_is_expected)?; } + (&ty::Error(e), _) | (_, &ty::Error(e)) => { + infcx.set_tainted_by_errors(e); + return Ok(Ty::new_error(self.tcx(), e)); + } + ( &ty::Alias(ty::Opaque, ty::AliasTy { def_id: a_def_id, .. }), &ty::Alias(ty::Opaque, ty::AliasTy { def_id: b_def_id, .. }), diff --git a/tests/ui/generic-associated-types/issue-79636-1.rs b/tests/ui/generic-associated-types/issue-79636-1.rs index a05311d59c1..3357afb9d4d 100644 --- a/tests/ui/generic-associated-types/issue-79636-1.rs +++ b/tests/ui/generic-associated-types/issue-79636-1.rs @@ -15,7 +15,6 @@ where //~^ ERROR: missing generics for associated type `Monad::Wrapped` { outer.bind(|inner| inner) - //~^ ERROR type annotations needed } fn main() { diff --git a/tests/ui/generic-associated-types/issue-79636-1.stderr b/tests/ui/generic-associated-types/issue-79636-1.stderr index 743d8b7d462..c31064dec62 100644 --- a/tests/ui/generic-associated-types/issue-79636-1.stderr +++ b/tests/ui/generic-associated-types/issue-79636-1.stderr @@ -30,19 +30,8 @@ help: function arguments must have a statically known size, borrowed types alway LL | fn bind(&self, f: F) -> Self::Wrapped { | + -error[E0282]: type annotations needed - --> $DIR/issue-79636-1.rs:17:17 - | -LL | outer.bind(|inner| inner) - | ^^^^^ - | -help: consider giving this closure parameter an explicit type - | -LL | outer.bind(|inner: /* Type */| inner) - | ++++++++++++ - error[E0277]: the trait bound `Option>: Monad` is not satisfied - --> $DIR/issue-79636-1.rs:22:21 + --> $DIR/issue-79636-1.rs:21:21 | LL | assert_eq!(join(Some(Some(true))), Some(true)); | ---- ^^^^^^^^^^^^^^^^ the trait `Monad` is not implemented for `Option>` @@ -63,7 +52,7 @@ LL | where LL | MOuter: Monad, | ^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `join` -error: aborting due to 4 previous errors +error: aborting due to 3 previous errors -Some errors have detailed explanations: E0107, E0277, E0282. +Some errors have detailed explanations: E0107, E0277. For more information about an error, try `rustc --explain E0107`. diff --git a/tests/ui/impl-trait/where-allowed.rs b/tests/ui/impl-trait/where-allowed.rs index 505e2d6c171..72ce617693e 100644 --- a/tests/ui/impl-trait/where-allowed.rs +++ b/tests/ui/impl-trait/where-allowed.rs @@ -59,7 +59,6 @@ fn in_impl_Fn_return_in_parameters(_: &impl Fn() -> impl Debug) { panic!() } fn in_impl_Fn_parameter_in_return() -> &'static impl Fn(impl Debug) { panic!() } //~^ ERROR `impl Trait` is not allowed in the parameters of `Fn` trait bounds //~| ERROR nested `impl Trait` is not allowed -//~| ERROR: type annotations needed // Allowed fn in_impl_Fn_return_in_return() -> &'static impl Fn() -> impl Debug { panic!() } diff --git a/tests/ui/impl-trait/where-allowed.stderr b/tests/ui/impl-trait/where-allowed.stderr index c22312cce19..f203f4cabc8 100644 --- a/tests/ui/impl-trait/where-allowed.stderr +++ b/tests/ui/impl-trait/where-allowed.stderr @@ -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 associated types is unstable - --> $DIR/where-allowed.rs:123:16 + --> $DIR/where-allowed.rs:122:16 | LL | type Out = impl Debug; | ^^^^^^^^^^ @@ -27,7 +27,7 @@ LL | type Out = impl Debug; = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date error[E0658]: `impl Trait` in type aliases is unstable - --> $DIR/where-allowed.rs:160:23 + --> $DIR/where-allowed.rs:159:23 | LL | type InTypeAlias = impl Debug; | ^^^^^^^^^^ @@ -37,7 +37,7 @@ LL | type InTypeAlias = impl Debug; = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date error[E0658]: `impl Trait` in type aliases is unstable - --> $DIR/where-allowed.rs:163:39 + --> $DIR/where-allowed.rs:162:39 | LL | type InReturnInTypeAlias = fn() -> impl Debug; | ^^^^^^^^^^ @@ -127,7 +127,7 @@ LL | fn in_impl_Fn_parameter_in_return() -> &'static impl Fn(impl Debug) { panic = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in the parameters of `Fn` trait bounds - --> $DIR/where-allowed.rs:69:38 + --> $DIR/where-allowed.rs:68:38 | LL | fn in_Fn_parameter_in_generics (_: F) { panic!() } | ^^^^^^^^^^ @@ -135,7 +135,7 @@ LL | fn in_Fn_parameter_in_generics (_: F) { panic!() } = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in the return type of `Fn` trait bounds - --> $DIR/where-allowed.rs:73:40 + --> $DIR/where-allowed.rs:72:40 | LL | fn in_Fn_return_in_generics impl Debug> (_: F) { panic!() } | ^^^^^^^^^^ @@ -143,7 +143,7 @@ LL | fn in_Fn_return_in_generics impl Debug> (_: F) { panic!() } = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in field types - --> $DIR/where-allowed.rs:87:32 + --> $DIR/where-allowed.rs:86:32 | LL | struct InBraceStructField { x: impl Debug } | ^^^^^^^^^^ @@ -151,7 +151,7 @@ LL | struct InBraceStructField { x: impl Debug } = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in field types - --> $DIR/where-allowed.rs:91:41 + --> $DIR/where-allowed.rs:90:41 | LL | struct InAdtInBraceStructField { x: Vec } | ^^^^^^^^^^ @@ -159,7 +159,7 @@ LL | struct InAdtInBraceStructField { x: Vec } = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in field types - --> $DIR/where-allowed.rs:95:27 + --> $DIR/where-allowed.rs:94:27 | LL | struct InTupleStructField(impl Debug); | ^^^^^^^^^^ @@ -167,7 +167,7 @@ LL | struct InTupleStructField(impl Debug); = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in field types - --> $DIR/where-allowed.rs:100:25 + --> $DIR/where-allowed.rs:99:25 | LL | InBraceVariant { x: impl Debug }, | ^^^^^^^^^^ @@ -175,7 +175,7 @@ LL | InBraceVariant { x: impl Debug }, = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in field types - --> $DIR/where-allowed.rs:102:20 + --> $DIR/where-allowed.rs:101:20 | LL | InTupleVariant(impl Debug), | ^^^^^^^^^^ @@ -183,7 +183,7 @@ LL | InTupleVariant(impl Debug), = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in `extern fn` parameters - --> $DIR/where-allowed.rs:144:33 + --> $DIR/where-allowed.rs:143:33 | LL | fn in_foreign_parameters(_: impl Debug); | ^^^^^^^^^^ @@ -191,7 +191,7 @@ LL | fn in_foreign_parameters(_: impl Debug); = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in `extern fn` return types - --> $DIR/where-allowed.rs:147:31 + --> $DIR/where-allowed.rs:146:31 | LL | fn in_foreign_return() -> impl Debug; | ^^^^^^^^^^ @@ -199,7 +199,7 @@ LL | fn in_foreign_return() -> impl Debug; = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in `fn` pointer return types - --> $DIR/where-allowed.rs:163:39 + --> $DIR/where-allowed.rs:162:39 | LL | type InReturnInTypeAlias = fn() -> impl Debug; | ^^^^^^^^^^ @@ -207,7 +207,7 @@ LL | type InReturnInTypeAlias = fn() -> impl Debug; = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in traits - --> $DIR/where-allowed.rs:168:16 + --> $DIR/where-allowed.rs:167:16 | LL | impl PartialEq for () { | ^^^^^^^^^^ @@ -215,7 +215,7 @@ LL | impl PartialEq for () { = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in impl headers - --> $DIR/where-allowed.rs:173:24 + --> $DIR/where-allowed.rs:172:24 | LL | impl PartialEq<()> for impl Debug { | ^^^^^^^^^^ @@ -223,7 +223,7 @@ LL | impl PartialEq<()> for impl Debug { = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in impl headers - --> $DIR/where-allowed.rs:178:6 + --> $DIR/where-allowed.rs:177:6 | LL | impl impl Debug { | ^^^^^^^^^^ @@ -231,7 +231,7 @@ LL | impl impl Debug { = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in impl headers - --> $DIR/where-allowed.rs:184:24 + --> $DIR/where-allowed.rs:183:24 | LL | impl InInherentImplAdt { | ^^^^^^^^^^ @@ -239,7 +239,7 @@ LL | impl InInherentImplAdt { = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in bounds - --> $DIR/where-allowed.rs:190:11 + --> $DIR/where-allowed.rs:189:11 | LL | where impl Debug: Debug | ^^^^^^^^^^ @@ -247,7 +247,7 @@ LL | where impl Debug: Debug = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in bounds - --> $DIR/where-allowed.rs:197:15 + --> $DIR/where-allowed.rs:196:15 | LL | where Vec: Debug | ^^^^^^^^^^ @@ -255,7 +255,7 @@ LL | where Vec: Debug = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in bounds - --> $DIR/where-allowed.rs:204:24 + --> $DIR/where-allowed.rs:203:24 | LL | where T: PartialEq | ^^^^^^^^^^ @@ -263,7 +263,7 @@ LL | where T: PartialEq = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in the parameters of `Fn` trait bounds - --> $DIR/where-allowed.rs:211:17 + --> $DIR/where-allowed.rs:210:17 | LL | where T: Fn(impl Debug) | ^^^^^^^^^^ @@ -271,7 +271,7 @@ LL | where T: Fn(impl Debug) = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in the return type of `Fn` trait bounds - --> $DIR/where-allowed.rs:218:22 + --> $DIR/where-allowed.rs:217:22 | LL | where T: Fn() -> impl Debug | ^^^^^^^^^^ @@ -279,7 +279,7 @@ LL | where T: Fn() -> impl Debug = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in generic parameter defaults - --> $DIR/where-allowed.rs:224:40 + --> $DIR/where-allowed.rs:223:40 | LL | struct InStructGenericParamDefault(T); | ^^^^^^^^^^ @@ -287,7 +287,7 @@ LL | struct InStructGenericParamDefault(T); = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in generic parameter defaults - --> $DIR/where-allowed.rs:228:36 + --> $DIR/where-allowed.rs:227:36 | LL | enum InEnumGenericParamDefault { Variant(T) } | ^^^^^^^^^^ @@ -295,7 +295,7 @@ LL | enum InEnumGenericParamDefault { Variant(T) } = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in generic parameter defaults - --> $DIR/where-allowed.rs:232:38 + --> $DIR/where-allowed.rs:231:38 | LL | trait InTraitGenericParamDefault {} | ^^^^^^^^^^ @@ -303,7 +303,7 @@ LL | trait InTraitGenericParamDefault {} = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in generic parameter defaults - --> $DIR/where-allowed.rs:236:41 + --> $DIR/where-allowed.rs:235:41 | LL | type InTypeAliasGenericParamDefault = T; | ^^^^^^^^^^ @@ -311,7 +311,7 @@ LL | type InTypeAliasGenericParamDefault = T; = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in generic parameter defaults - --> $DIR/where-allowed.rs:240:11 + --> $DIR/where-allowed.rs:239:11 | LL | impl T {} | ^^^^^^^^^^ @@ -319,7 +319,7 @@ LL | impl T {} = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in generic parameter defaults - --> $DIR/where-allowed.rs:247:40 + --> $DIR/where-allowed.rs:246:40 | LL | fn in_method_generic_param_default(_: T) {} | ^^^^^^^^^^ @@ -327,7 +327,7 @@ LL | fn in_method_generic_param_default(_: T) {} = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in the type of variable bindings - --> $DIR/where-allowed.rs:253:29 + --> $DIR/where-allowed.rs:252:29 | LL | let _in_local_variable: impl Fn() = || {}; | ^^^^^^^^^ @@ -335,7 +335,7 @@ LL | let _in_local_variable: impl Fn() = || {}; = note: `impl Trait` is only allowed in arguments and return types of functions and methods error[E0562]: `impl Trait` is not allowed in closure return types - --> $DIR/where-allowed.rs:255:46 + --> $DIR/where-allowed.rs:254:46 | LL | let _in_return_in_local_variable = || -> impl Fn() { || {} }; | ^^^^^^^^^ @@ -343,7 +343,7 @@ LL | let _in_return_in_local_variable = || -> impl Fn() { || {} }; = note: `impl Trait` is only allowed in arguments and return types of functions and methods error: defaults for type parameters are only allowed in `struct`, `enum`, `type`, or `trait` definitions - --> $DIR/where-allowed.rs:240:7 + --> $DIR/where-allowed.rs:239:7 | LL | impl T {} | ^^^^^^^^^^^^^^ @@ -353,7 +353,7 @@ LL | impl T {} = note: `#[deny(invalid_type_param_default)]` on by default error: defaults for type parameters are only allowed in `struct`, `enum`, `type`, or `trait` definitions - --> $DIR/where-allowed.rs:247:36 + --> $DIR/where-allowed.rs:246:36 | LL | fn in_method_generic_param_default(_: T) {} | ^^^^^^^^^^^^^^ @@ -362,7 +362,7 @@ LL | fn in_method_generic_param_default(_: T) {} = note: for more information, see issue #36887 error[E0118]: no nominal type found for inherent implementation - --> $DIR/where-allowed.rs:240:1 + --> $DIR/where-allowed.rs:239:1 | LL | impl T {} | ^^^^^^^^^^^^^^^^^^^^^^^ impl requires a nominal type @@ -377,14 +377,8 @@ LL | fn in_dyn_Fn_return_in_return() -> &'static dyn Fn() -> impl Debug { panic! | = note: cannot satisfy `_: Debug` -error[E0282]: type annotations needed - --> $DIR/where-allowed.rs:59:49 - | -LL | fn in_impl_Fn_parameter_in_return() -> &'static impl Fn(impl Debug) { panic!() } - | ^^^^^^^^^^^^^^^^^^^ cannot infer type - error[E0283]: type annotations needed - --> $DIR/where-allowed.rs:65:46 + --> $DIR/where-allowed.rs:64:46 | LL | fn in_impl_Fn_return_in_return() -> &'static impl Fn() -> impl Debug { panic!() } | ^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type @@ -396,7 +390,7 @@ LL | fn in_impl_Fn_return_in_return() -> &'static impl Fn() -> impl Debug { pani where Args: Tuple, F: Fn, A: Allocator, F: ?Sized; error[E0599]: no function or associated item named `into_vec` found for slice `[_]` in the current scope - --> $DIR/where-allowed.rs:82:5 + --> $DIR/where-allowed.rs:81:5 | LL | vec![vec![0; 10], vec![12; 7], vec![8; 3]] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ function or associated item not found in `[_]` @@ -404,7 +398,7 @@ LL | vec![vec![0; 10], vec![12; 7], vec![8; 3]] = note: this error originates in the macro `vec` (in Nightly builds, run with -Z macro-backtrace for more info) error[E0053]: method `in_trait_impl_return` has an incompatible type for trait - --> $DIR/where-allowed.rs:130:34 + --> $DIR/where-allowed.rs:129:34 | LL | type Out = impl Debug; | ---------- the expected opaque type @@ -416,7 +410,7 @@ LL | fn in_trait_impl_return() -> impl Debug { () } | help: change the output type to match the trait: `<() as DummyTrait>::Out` | note: type in trait - --> $DIR/where-allowed.rs:120:34 + --> $DIR/where-allowed.rs:119:34 | LL | fn in_trait_impl_return() -> Self::Out; | ^^^^^^^^^ @@ -425,14 +419,14 @@ LL | fn in_trait_impl_return() -> Self::Out; = note: distinct uses of `impl Trait` result in different opaque types error: unconstrained opaque type - --> $DIR/where-allowed.rs:123:16 + --> $DIR/where-allowed.rs:122:16 | LL | type Out = impl Debug; | ^^^^^^^^^^ | = note: `Out` must be used in combination with a concrete type within the same impl -error: aborting due to 51 previous errors +error: aborting due to 50 previous errors -Some errors have detailed explanations: E0053, E0118, E0282, E0283, E0562, E0599, E0658, E0666. +Some errors have detailed explanations: E0053, E0118, E0283, E0562, E0599, E0658, E0666. For more information about an error, try `rustc --explain E0053`. diff --git a/tests/ui/type-alias-impl-trait/impl-trait-in-type-alias-with-bad-substs.rs b/tests/ui/type-alias-impl-trait/impl-trait-in-type-alias-with-bad-substs.rs index a3f65146f75..71416eb531a 100644 --- a/tests/ui/type-alias-impl-trait/impl-trait-in-type-alias-with-bad-substs.rs +++ b/tests/ui/type-alias-impl-trait/impl-trait-in-type-alias-with-bad-substs.rs @@ -18,7 +18,6 @@ impl Foo for () { type Baz = impl Sized; //~^ ERROR type `Baz` has 1 type parameter but its trait declaration has 0 type parameters - //~| ERROR unconstrained opaque type fn test<'a>() -> Self::Bar<'a> { &() diff --git a/tests/ui/type-alias-impl-trait/impl-trait-in-type-alias-with-bad-substs.stderr b/tests/ui/type-alias-impl-trait/impl-trait-in-type-alias-with-bad-substs.stderr index 13f5d8b8ea6..e5a21ff8b4e 100644 --- a/tests/ui/type-alias-impl-trait/impl-trait-in-type-alias-with-bad-substs.stderr +++ b/tests/ui/type-alias-impl-trait/impl-trait-in-type-alias-with-bad-substs.stderr @@ -7,14 +7,6 @@ LL | type Baz<'a>; LL | type Baz = impl Sized; | ^ found 1 type parameter -error: unconstrained opaque type - --> $DIR/impl-trait-in-type-alias-with-bad-substs.rs:19:19 - | -LL | type Baz = impl Sized; - | ^^^^^^^^^^ - | - = note: `Baz` must be used in combination with a concrete type within the same impl - -error: aborting due to 2 previous errors +error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0049`. diff --git a/tests/ui/wf/issue-110157.rs b/tests/ui/wf/issue-110157.rs index 07e2c5d58c3..1a3d13e93b0 100644 --- a/tests/ui/wf/issue-110157.rs +++ b/tests/ui/wf/issue-110157.rs @@ -1,8 +1,7 @@ struct NeedsDropTypes<'tcx, F>(std::marker::PhantomData<&'tcx F>); impl<'tcx, F, I> Iterator for NeedsDropTypes<'tcx, F> -//~^ ERROR type annotations needed -//~| ERROR not all trait items implemented +//~^ ERROR not all trait items implemented where F: Fn(&Missing) -> Result, //~^ ERROR cannot find type `Missing` in this scope diff --git a/tests/ui/wf/issue-110157.stderr b/tests/ui/wf/issue-110157.stderr index 16bd34a6d8e..e750ea47d51 100644 --- a/tests/ui/wf/issue-110157.stderr +++ b/tests/ui/wf/issue-110157.stderr @@ -1,37 +1,20 @@ error[E0412]: cannot find type `Missing` in this scope - --> $DIR/issue-110157.rs:7:12 + --> $DIR/issue-110157.rs:6:12 | LL | F: Fn(&Missing) -> Result, | ^^^^^^^ not found in this scope error[E0412]: cannot find type `Missing` in this scope - --> $DIR/issue-110157.rs:9:24 + --> $DIR/issue-110157.rs:8:24 | LL | I: Iterator, | ^^^^^^^ not found in this scope -error[E0283]: type annotations needed - --> $DIR/issue-110157.rs:3:31 - | -LL | impl<'tcx, F, I> Iterator for NeedsDropTypes<'tcx, F> - | ^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type for type parameter `I` - | - = note: cannot satisfy `_: Iterator` -note: required for `NeedsDropTypes<'tcx, F>` to implement `Iterator` - --> $DIR/issue-110157.rs:3:18 - | -LL | impl<'tcx, F, I> Iterator for NeedsDropTypes<'tcx, F> - | ^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^ -... -LL | I: Iterator, - | ------------------------ unsatisfied trait bound introduced here - error[E0046]: not all trait items implemented, missing: `Item`, `next` --> $DIR/issue-110157.rs:3:1 | LL | / impl<'tcx, F, I> Iterator for NeedsDropTypes<'tcx, F> LL | | -LL | | LL | | where LL | | F: Fn(&Missing) -> Result, LL | | @@ -41,7 +24,7 @@ LL | | I: Iterator, = help: implement the missing item: `type Item = /* Type */;` = help: implement the missing item: `fn next(&mut self) -> Option<::Item> { todo!() }` -error: aborting due to 4 previous errors +error: aborting due to 3 previous errors -Some errors have detailed explanations: E0046, E0283, E0412. +Some errors have detailed explanations: E0046, E0412. For more information about an error, try `rustc --explain E0046`.