diff options
Diffstat (limited to 'src/test/ui/type-alias-impl-trait')
32 files changed, 359 insertions, 169 deletions
diff --git a/src/test/ui/type-alias-impl-trait/coherence.rs b/src/test/ui/type-alias-impl-trait/coherence.rs index 98ac215ad..077a31494 100644 --- a/src/test/ui/type-alias-impl-trait/coherence.rs +++ b/src/test/ui/type-alias-impl-trait/coherence.rs @@ -12,6 +12,6 @@ fn use_alias<T>(val: T) -> AliasOfForeignType<T> { } impl<T> foreign_crate::ForeignTrait for AliasOfForeignType<T> {} -//~^ ERROR cannot implement trait on type alias impl trait +//~^ ERROR only traits defined in the current crate can be implemented for arbitrary types fn main() {} diff --git a/src/test/ui/type-alias-impl-trait/coherence.stderr b/src/test/ui/type-alias-impl-trait/coherence.stderr index 3ce25d94f..c923eb08a 100644 --- a/src/test/ui/type-alias-impl-trait/coherence.stderr +++ b/src/test/ui/type-alias-impl-trait/coherence.stderr @@ -1,14 +1,14 @@ -error: cannot implement trait on type alias impl trait - --> $DIR/coherence.rs:14:41 +error[E0117]: only traits defined in the current crate can be implemented for arbitrary types + --> $DIR/coherence.rs:14:1 | LL | impl<T> foreign_crate::ForeignTrait for AliasOfForeignType<T> {} - | ^^^^^^^^^^^^^^^^^^^^^ + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^--------------------- + | | | + | | `AliasOfForeignType<T>` is not defined in the current crate + | impl doesn't use only types from inside the current crate | -note: type alias impl trait defined here - --> $DIR/coherence.rs:9:30 - | -LL | type AliasOfForeignType<T> = impl LocalTrait; - | ^^^^^^^^^^^^^^^ + = note: define and implement a trait or new type instead error: aborting due to previous error +For more information about this error, try `rustc --explain E0117`. diff --git a/src/test/ui/type-alias-impl-trait/coherence_generalization.rs b/src/test/ui/type-alias-impl-trait/coherence_generalization.rs new file mode 100644 index 000000000..5c9ad9498 --- /dev/null +++ b/src/test/ui/type-alias-impl-trait/coherence_generalization.rs @@ -0,0 +1,13 @@ +// check-pass + +#![feature(type_alias_impl_trait)] +trait Trait {} +type Opaque<T> = impl Sized; +fn foo<T>() -> Opaque<T> { + () +} + +impl<T, V> Trait for (T, V, V, u32) {} +impl<U, V> Trait for (Opaque<U>, V, i32, V) {} + +fn main() {} diff --git a/src/test/ui/type-alias-impl-trait/impl_trait_for_generic_tait.rs b/src/test/ui/type-alias-impl-trait/impl_trait_for_generic_tait.rs new file mode 100644 index 000000000..0efbd1c2b --- /dev/null +++ b/src/test/ui/type-alias-impl-trait/impl_trait_for_generic_tait.rs @@ -0,0 +1,23 @@ +// check-pass + +#![feature(type_alias_impl_trait)] +trait Foo { + type Assoc; +} + +impl Foo for i32 { + type Assoc = u32; +} +type ImplTrait = impl Sized; +fn constrain() -> ImplTrait { + 1u64 +} +impl Foo for i64 { + type Assoc = ImplTrait; +} + +trait Bar<T> {} + +impl<T: Foo> Bar<<T as Foo>::Assoc> for T {} + +fn main() {} diff --git a/src/test/ui/type-alias-impl-trait/impl_trait_for_same_tait.rs b/src/test/ui/type-alias-impl-trait/impl_trait_for_same_tait.rs new file mode 100644 index 000000000..3f1a9d12b --- /dev/null +++ b/src/test/ui/type-alias-impl-trait/impl_trait_for_same_tait.rs @@ -0,0 +1,33 @@ +#![feature(type_alias_impl_trait)] + +trait Foo {} +impl Foo for () {} +impl Foo for i32 {} + +type Bar<T: Foo> = impl std::fmt::Debug; +fn defining_use<T: Foo>() -> Bar<T> { + 42 +} + +trait Bop {} + +impl Bop for Bar<()> {} + +// If the hidden type is the same, this is effectively a second impl for the same type. +impl Bop for Bar<i32> {} +//~^ ERROR conflicting implementations + +type Barr = impl std::fmt::Debug; +fn defining_use2() -> Barr { + 42 +} + +// Even completely different opaque types must conflict. +impl Bop for Barr {} +//~^ ERROR conflicting implementations + +// And obviously the hidden type must conflict, too. +impl Bop for i32 {} +//~^ ERROR conflicting implementations + +fn main() {} diff --git a/src/test/ui/type-alias-impl-trait/impl_trait_for_same_tait.stderr b/src/test/ui/type-alias-impl-trait/impl_trait_for_same_tait.stderr new file mode 100644 index 000000000..aaf75cc3d --- /dev/null +++ b/src/test/ui/type-alias-impl-trait/impl_trait_for_same_tait.stderr @@ -0,0 +1,30 @@ +error[E0119]: conflicting implementations of trait `Bop` for type `Bar<()>` + --> $DIR/impl_trait_for_same_tait.rs:17:1 + | +LL | impl Bop for Bar<()> {} + | -------------------- first implementation here +... +LL | impl Bop for Bar<i32> {} + | ^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `Bar<()>` + +error[E0119]: conflicting implementations of trait `Bop` for type `Bar<()>` + --> $DIR/impl_trait_for_same_tait.rs:26:1 + | +LL | impl Bop for Bar<()> {} + | -------------------- first implementation here +... +LL | impl Bop for Barr {} + | ^^^^^^^^^^^^^^^^^ conflicting implementation for `Bar<()>` + +error[E0119]: conflicting implementations of trait `Bop` for type `Bar<()>` + --> $DIR/impl_trait_for_same_tait.rs:30:1 + | +LL | impl Bop for Bar<()> {} + | -------------------- first implementation here +... +LL | impl Bop for i32 {} + | ^^^^^^^^^^^^^^^^ conflicting implementation for `Bar<()>` + +error: aborting due to 3 previous errors + +For more information about this error, try `rustc --explain E0119`. diff --git a/src/test/ui/type-alias-impl-trait/impl_trait_for_tait.rs b/src/test/ui/type-alias-impl-trait/impl_trait_for_tait.rs new file mode 100644 index 000000000..9f32c5d88 --- /dev/null +++ b/src/test/ui/type-alias-impl-trait/impl_trait_for_tait.rs @@ -0,0 +1,21 @@ +// compile-flags: --crate-type=lib +// check-pass + +#![feature(type_alias_impl_trait)] +type Alias = impl Sized; + +fn constrain() -> Alias { + 1i32 +} + +trait HideIt { + type Assoc; +} + +impl HideIt for () { + type Assoc = Alias; +} + +pub trait Yay {} + +impl Yay for <() as HideIt>::Assoc {} diff --git a/src/test/ui/type-alias-impl-trait/impl_trait_for_tait_bound.rs b/src/test/ui/type-alias-impl-trait/impl_trait_for_tait_bound.rs new file mode 100644 index 000000000..8ec20acef --- /dev/null +++ b/src/test/ui/type-alias-impl-trait/impl_trait_for_tait_bound.rs @@ -0,0 +1,19 @@ +#![feature(type_alias_impl_trait)] + +use std::fmt::Debug; + +type Foo = impl Debug; +pub trait Yay { } +impl Yay for Foo { } + +fn foo() { + is_yay::<u32>(); //~ ERROR: the trait bound `u32: Yay` is not satisfied + is_debug::<u32>(); // OK + is_yay::<Foo>(); // OK + is_debug::<Foo>(); // OK +} + +fn is_yay<T: Yay>() { } +fn is_debug<T: Debug>() { } + +fn main() {} diff --git a/src/test/ui/type-alias-impl-trait/impl_trait_for_tait_bound.stderr b/src/test/ui/type-alias-impl-trait/impl_trait_for_tait_bound.stderr new file mode 100644 index 000000000..1c83105a1 --- /dev/null +++ b/src/test/ui/type-alias-impl-trait/impl_trait_for_tait_bound.stderr @@ -0,0 +1,16 @@ +error[E0277]: the trait bound `u32: Yay` is not satisfied + --> $DIR/impl_trait_for_tait_bound.rs:10:14 + | +LL | is_yay::<u32>(); + | ^^^ the trait `Yay` is not implemented for `u32` + | + = help: the trait `Yay` is implemented for `Foo` +note: required by a bound in `is_yay` + --> $DIR/impl_trait_for_tait_bound.rs:16:14 + | +LL | fn is_yay<T: Yay>() { } + | ^^^ required by this bound in `is_yay` + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0277`. diff --git a/src/test/ui/type-alias-impl-trait/impl_trait_for_tait_bound2.rs b/src/test/ui/type-alias-impl-trait/impl_trait_for_tait_bound2.rs new file mode 100644 index 000000000..a4b8c2d19 --- /dev/null +++ b/src/test/ui/type-alias-impl-trait/impl_trait_for_tait_bound2.rs @@ -0,0 +1,16 @@ +#![feature(type_alias_impl_trait)] + +use std::fmt::Debug; + +type Foo = impl Debug; + +pub trait Yay { } +impl Yay for u32 { } + +fn foo() { + is_yay::<Foo>(); //~ ERROR: the trait bound `Foo: Yay` is not satisfied +} + +fn is_yay<T: Yay>() { } + +fn main() {} diff --git a/src/test/ui/type-alias-impl-trait/impl_trait_for_tait_bound2.stderr b/src/test/ui/type-alias-impl-trait/impl_trait_for_tait_bound2.stderr new file mode 100644 index 000000000..a6440f02c --- /dev/null +++ b/src/test/ui/type-alias-impl-trait/impl_trait_for_tait_bound2.stderr @@ -0,0 +1,16 @@ +error[E0277]: the trait bound `Foo: Yay` is not satisfied + --> $DIR/impl_trait_for_tait_bound2.rs:11:14 + | +LL | is_yay::<Foo>(); + | ^^^ the trait `Yay` is not implemented for `Foo` + | + = help: the trait `Yay` is implemented for `u32` +note: required by a bound in `is_yay` + --> $DIR/impl_trait_for_tait_bound2.rs:14:14 + | +LL | fn is_yay<T: Yay>() { } + | ^^^ required by this bound in `is_yay` + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0277`. diff --git a/src/test/ui/type-alias-impl-trait/imply_bounds_from_bounds.rs b/src/test/ui/type-alias-impl-trait/imply_bounds_from_bounds.rs new file mode 100644 index 000000000..ee9bce15d --- /dev/null +++ b/src/test/ui/type-alias-impl-trait/imply_bounds_from_bounds.rs @@ -0,0 +1,25 @@ +// check-pass + +#![feature(type_alias_impl_trait)] + +trait Callable { + type Output; + fn call() -> Self::Output; +} + +impl<'a> Callable for &'a () { + type Output = impl Sized; + fn call() -> Self::Output {} +} + +fn test<'a>() -> impl Sized { + <&'a () as Callable>::call() +} + +fn want_static<T: 'static>(_: T) {} + +fn test2<'a>() { + want_static(<&'a () as Callable>::call()); +} + +fn main() {} diff --git a/src/test/ui/type-alias-impl-trait/imply_bounds_from_bounds_param.rs b/src/test/ui/type-alias-impl-trait/imply_bounds_from_bounds_param.rs new file mode 100644 index 000000000..ae21a9134 --- /dev/null +++ b/src/test/ui/type-alias-impl-trait/imply_bounds_from_bounds_param.rs @@ -0,0 +1,38 @@ +#![feature(type_alias_impl_trait)] + +trait Callable { + type Output; + fn call(x: Self) -> Self::Output; +} + +trait PlusOne { + fn plus_one(&mut self); +} + +impl<'a> PlusOne for &'a mut i32 { + fn plus_one(&mut self) { + **self += 1; + } +} + +impl<T: PlusOne> Callable for T { + type Output = impl PlusOne; + fn call(t: T) -> Self::Output { t } +} + +fn test<'a>(y: &'a mut i32) -> impl PlusOne { + <&'a mut i32 as Callable>::call(y) + //~^ ERROR hidden type for `impl PlusOne` captures lifetime that does not appear in bounds +} + +fn main() { + let mut z = 42; + let mut thing = test(&mut z); + let mut thing2 = test(&mut z); + thing.plus_one(); + assert_eq!(z, 43); + thing2.plus_one(); + assert_eq!(z, 44); + thing.plus_one(); + assert_eq!(z, 45); +} diff --git a/src/test/ui/type-alias-impl-trait/imply_bounds_from_bounds_param.stderr b/src/test/ui/type-alias-impl-trait/imply_bounds_from_bounds_param.stderr new file mode 100644 index 000000000..0ed8a703b --- /dev/null +++ b/src/test/ui/type-alias-impl-trait/imply_bounds_from_bounds_param.stderr @@ -0,0 +1,16 @@ +error[E0700]: hidden type for `impl PlusOne` captures lifetime that does not appear in bounds + --> $DIR/imply_bounds_from_bounds_param.rs:24:5 + | +LL | fn test<'a>(y: &'a mut i32) -> impl PlusOne { + | -- hidden type `<&'a mut i32 as Callable>::Output` captures the lifetime `'a` as defined here +LL | <&'a mut i32 as Callable>::call(y) + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | +help: to declare that `impl PlusOne` captures `'a`, you can add an explicit `'a` lifetime bound + | +LL | fn test<'a>(y: &'a mut i32) -> impl PlusOne + 'a { + | ++++ + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0700`. diff --git a/src/test/ui/type-alias-impl-trait/issue-57611-trait-alias.rs b/src/test/ui/type-alias-impl-trait/issue-57611-trait-alias.rs index 067ed7ea1..cad3e0f66 100644 --- a/src/test/ui/type-alias-impl-trait/issue-57611-trait-alias.rs +++ b/src/test/ui/type-alias-impl-trait/issue-57611-trait-alias.rs @@ -1,7 +1,6 @@ +// check-pass // Regression test for issue #57611 // Ensures that we don't ICE -// FIXME: This should compile, but it currently doesn't -// known-bug: unknown #![feature(trait_alias)] #![feature(type_alias_impl_trait)] diff --git a/src/test/ui/type-alias-impl-trait/issue-57611-trait-alias.stderr b/src/test/ui/type-alias-impl-trait/issue-57611-trait-alias.stderr deleted file mode 100644 index 6344f114a..000000000 --- a/src/test/ui/type-alias-impl-trait/issue-57611-trait-alias.stderr +++ /dev/null @@ -1,26 +0,0 @@ -error[E0308]: mismatched types - --> $DIR/issue-57611-trait-alias.rs:21:9 - | -LL | |x| x - | ^^^^^ one type is more general than the other - | - = note: expected trait `for<'a> Fn<(&'a X,)>` - found trait `Fn<(&X,)>` -note: this closure does not fulfill the lifetime requirements - --> $DIR/issue-57611-trait-alias.rs:21:9 - | -LL | |x| x - | ^^^ - -error: implementation of `FnOnce` is not general enough - --> $DIR/issue-57611-trait-alias.rs:21:9 - | -LL | |x| x - | ^^^^^ implementation of `FnOnce` is not general enough - | - = note: closure with signature `fn(&'2 X) -> &X` must implement `FnOnce<(&'1 X,)>`, for any lifetime `'1`... - = note: ...but it actually implements `FnOnce<(&'2 X,)>`, for some specific lifetime `'2` - -error: aborting due to 2 previous errors - -For more information about this error, try `rustc --explain E0308`. diff --git a/src/test/ui/type-alias-impl-trait/issue-65384.rs b/src/test/ui/type-alias-impl-trait/issue-65384.rs index 9a119c4d2..9a9b2269f 100644 --- a/src/test/ui/type-alias-impl-trait/issue-65384.rs +++ b/src/test/ui/type-alias-impl-trait/issue-65384.rs @@ -8,7 +8,7 @@ impl MyTrait for () {} type Bar = impl MyTrait; impl MyTrait for Bar {} -//~^ ERROR: cannot implement trait on type alias impl trait +//~^ ERROR: conflicting implementations of trait `MyTrait` for type `()` fn bazr() -> Bar { } diff --git a/src/test/ui/type-alias-impl-trait/issue-65384.stderr b/src/test/ui/type-alias-impl-trait/issue-65384.stderr index 41bcea27e..f6692ae32 100644 --- a/src/test/ui/type-alias-impl-trait/issue-65384.stderr +++ b/src/test/ui/type-alias-impl-trait/issue-65384.stderr @@ -1,14 +1,12 @@ -error: cannot implement trait on type alias impl trait - --> $DIR/issue-65384.rs:10:18 +error[E0119]: conflicting implementations of trait `MyTrait` for type `()` + --> $DIR/issue-65384.rs:10:1 | +LL | impl MyTrait for () {} + | ------------------- first implementation here +... LL | impl MyTrait for Bar {} - | ^^^ - | -note: type alias impl trait defined here - --> $DIR/issue-65384.rs:8:12 - | -LL | type Bar = impl MyTrait; - | ^^^^^^^^^^^^ + | ^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `()` error: aborting due to previous error +For more information about this error, try `rustc --explain E0119`. diff --git a/src/test/ui/type-alias-impl-trait/issue-76202-trait-impl-for-tait.rs b/src/test/ui/type-alias-impl-trait/issue-76202-trait-impl-for-tait.rs index fb56cc54d..b97e444c6 100644 --- a/src/test/ui/type-alias-impl-trait/issue-76202-trait-impl-for-tait.rs +++ b/src/test/ui/type-alias-impl-trait/issue-76202-trait-impl-for-tait.rs @@ -1,6 +1,8 @@ // Regression test for issue #76202 // Tests that we don't ICE when we have a trait impl on a TAIT. +// check-pass + #![feature(type_alias_impl_trait)] trait Dummy {} @@ -14,7 +16,12 @@ trait Test { } impl Test for F { - //~^ ERROR cannot implement trait + fn test(self) {} +} + +// Ok because `i32` does not implement `Dummy`, +// so it can't possibly be the hidden type of `F`. +impl Test for i32 { fn test(self) {} } diff --git a/src/test/ui/type-alias-impl-trait/issue-76202-trait-impl-for-tait.stderr b/src/test/ui/type-alias-impl-trait/issue-76202-trait-impl-for-tait.stderr deleted file mode 100644 index 2d4a6854a..000000000 --- a/src/test/ui/type-alias-impl-trait/issue-76202-trait-impl-for-tait.stderr +++ /dev/null @@ -1,14 +0,0 @@ -error: cannot implement trait on type alias impl trait - --> $DIR/issue-76202-trait-impl-for-tait.rs:16:15 - | -LL | impl Test for F { - | ^ - | -note: type alias impl trait defined here - --> $DIR/issue-76202-trait-impl-for-tait.rs:9:10 - | -LL | type F = impl Dummy; - | ^^^^^^^^^^ - -error: aborting due to previous error - diff --git a/src/test/ui/type-alias-impl-trait/issue-84660-trait-impl-for-tait.rs b/src/test/ui/type-alias-impl-trait/issue-84660-trait-impl-for-tait.rs index fa25d8f76..2ba4befea 100644 --- a/src/test/ui/type-alias-impl-trait/issue-84660-trait-impl-for-tait.rs +++ b/src/test/ui/type-alias-impl-trait/issue-84660-trait-impl-for-tait.rs @@ -1,6 +1,8 @@ // Regression test for issues #84660 and #86411: both are variations on #76202. // Tests that we don't ICE when we have an opaque type appearing anywhere in an impl header. +// check-pass + #![feature(type_alias_impl_trait)] trait Foo {} @@ -12,7 +14,7 @@ trait TraitArg<T> { fn f(); } -impl TraitArg<Bar> for () { //~ ERROR cannot implement trait +impl TraitArg<Bar> for () { fn f() { println!("ho"); } diff --git a/src/test/ui/type-alias-impl-trait/issue-84660-trait-impl-for-tait.stderr b/src/test/ui/type-alias-impl-trait/issue-84660-trait-impl-for-tait.stderr deleted file mode 100644 index bb70d07be..000000000 --- a/src/test/ui/type-alias-impl-trait/issue-84660-trait-impl-for-tait.stderr +++ /dev/null @@ -1,14 +0,0 @@ -error: cannot implement trait on type alias impl trait - --> $DIR/issue-84660-trait-impl-for-tait.rs:15:15 - | -LL | impl TraitArg<Bar> for () { - | ^^^ - | -note: type alias impl trait defined here - --> $DIR/issue-84660-trait-impl-for-tait.rs:8:12 - | -LL | type Bar = impl Foo; - | ^^^^^^^^ - -error: aborting due to previous error - diff --git a/src/test/ui/type-alias-impl-trait/issue-84660-unsoundness.rs b/src/test/ui/type-alias-impl-trait/issue-84660-unsoundness.rs index f12d1b6d9..48d4b0c96 100644 --- a/src/test/ui/type-alias-impl-trait/issue-84660-unsoundness.rs +++ b/src/test/ui/type-alias-impl-trait/issue-84660-unsoundness.rs @@ -13,14 +13,14 @@ trait Trait<T, In> { fn convert(i: In) -> Self::Out; } -impl<In, Out> Trait<Bar, In> for Out { //~ ERROR cannot implement trait +impl<In, Out> Trait<Bar, In> for Out { type Out = Out; fn convert(_i: In) -> Self::Out { unreachable!(); } } -impl<In, Out> Trait<(), In> for Out { +impl<In, Out> Trait<(), In> for Out { //~ ERROR conflicting implementations of trait `Trait<Bar, _>` type Out = In; fn convert(i: In) -> Self::Out { i diff --git a/src/test/ui/type-alias-impl-trait/issue-84660-unsoundness.stderr b/src/test/ui/type-alias-impl-trait/issue-84660-unsoundness.stderr index f2d600fb4..6a75e1bd2 100644 --- a/src/test/ui/type-alias-impl-trait/issue-84660-unsoundness.stderr +++ b/src/test/ui/type-alias-impl-trait/issue-84660-unsoundness.stderr @@ -1,14 +1,12 @@ -error: cannot implement trait on type alias impl trait - --> $DIR/issue-84660-unsoundness.rs:16:21 +error[E0119]: conflicting implementations of trait `Trait<Bar, _>` + --> $DIR/issue-84660-unsoundness.rs:23:1 | LL | impl<In, Out> Trait<Bar, In> for Out { - | ^^^ - | -note: type alias impl trait defined here - --> $DIR/issue-84660-unsoundness.rs:8:12 - | -LL | type Bar = impl Foo; - | ^^^^^^^^ + | ------------------------------------ first implementation here +... +LL | impl<In, Out> Trait<(), In> for Out { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation error: aborting due to previous error +For more information about this error, try `rustc --explain E0119`. diff --git a/src/test/ui/type-alias-impl-trait/missing_lifetime_bound.rs b/src/test/ui/type-alias-impl-trait/missing_lifetime_bound.rs index 428194058..01d1f5db1 100644 --- a/src/test/ui/type-alias-impl-trait/missing_lifetime_bound.rs +++ b/src/test/ui/type-alias-impl-trait/missing_lifetime_bound.rs @@ -2,6 +2,6 @@ type Opaque<'a, T> = impl Sized; fn defining<'a, T>(x: &'a i32) -> Opaque<T> { x } -//~^ ERROR: non-defining opaque type use in defining scope +//~^ ERROR: hidden type for `Opaque<'a, T>` captures lifetime that does not appear in bounds fn main() {} diff --git a/src/test/ui/type-alias-impl-trait/missing_lifetime_bound.stderr b/src/test/ui/type-alias-impl-trait/missing_lifetime_bound.stderr index df2b3ed19..65a0af0d2 100644 --- a/src/test/ui/type-alias-impl-trait/missing_lifetime_bound.stderr +++ b/src/test/ui/type-alias-impl-trait/missing_lifetime_bound.stderr @@ -1,8 +1,11 @@ -error: non-defining opaque type use in defining scope +error[E0700]: hidden type for `Opaque<'a, T>` captures lifetime that does not appear in bounds --> $DIR/missing_lifetime_bound.rs:4:47 | LL | fn defining<'a, T>(x: &'a i32) -> Opaque<T> { x } - | ^ lifetime `'a` is part of concrete type but not used in parameter list of the `impl Trait` type alias + | -- ^ + | | + | hidden type `&'a i32` captures the lifetime `'a` as defined here error: aborting due to previous error +For more information about this error, try `rustc --explain E0700`. diff --git a/src/test/ui/type-alias-impl-trait/nested-tait-inference3.rs b/src/test/ui/type-alias-impl-trait/nested-tait-inference3.rs index ebf3a99bb..b0ebdd1bf 100644 --- a/src/test/ui/type-alias-impl-trait/nested-tait-inference3.rs +++ b/src/test/ui/type-alias-impl-trait/nested-tait-inference3.rs @@ -4,11 +4,11 @@ use std::fmt::Debug; type FooX = impl Debug; +//~^ ERROR unconstrained opaque type trait Foo<A> { } impl Foo<FooX> for () { } -//~^ cannot implement trait on type alias impl trait fn foo() -> impl Foo<FooX> { () diff --git a/src/test/ui/type-alias-impl-trait/nested-tait-inference3.stderr b/src/test/ui/type-alias-impl-trait/nested-tait-inference3.stderr index 4a3fb1673..b1d947a9c 100644 --- a/src/test/ui/type-alias-impl-trait/nested-tait-inference3.stderr +++ b/src/test/ui/type-alias-impl-trait/nested-tait-inference3.stderr @@ -1,14 +1,10 @@ -error: cannot implement trait on type alias impl trait - --> $DIR/nested-tait-inference3.rs:10:10 - | -LL | impl Foo<FooX> for () { } - | ^^^^ - | -note: type alias impl trait defined here +error: unconstrained opaque type --> $DIR/nested-tait-inference3.rs:6:13 | LL | type FooX = impl Debug; | ^^^^^^^^^^ + | + = note: `FooX` must be used in combination with a concrete type within the same module error: aborting due to previous error diff --git a/src/test/ui/type-alias-impl-trait/self-referential-2.stderr b/src/test/ui/type-alias-impl-trait/self-referential-2.stderr index 2b505d307..c2cf70687 100644 --- a/src/test/ui/type-alias-impl-trait/self-referential-2.stderr +++ b/src/test/ui/type-alias-impl-trait/self-referential-2.stderr @@ -7,16 +7,7 @@ LL | 42_i32 | ------ return type was inferred to be `i32` here | = help: the trait `PartialEq<Foo>` is not implemented for `i32` - = help: the following other types implement trait `PartialEq<Rhs>`: - f32 - f64 - i128 - i16 - i32 - i64 - i8 - isize - and 6 others + = help: the trait `PartialEq` is implemented for `i32` error: aborting due to previous error diff --git a/src/test/ui/type-alias-impl-trait/self-referential-4.stderr b/src/test/ui/type-alias-impl-trait/self-referential-4.stderr index 27880f792..98c762e3d 100644 --- a/src/test/ui/type-alias-impl-trait/self-referential-4.stderr +++ b/src/test/ui/type-alias-impl-trait/self-referential-4.stderr @@ -7,16 +7,7 @@ LL | i | - return type was inferred to be `&i32` here | = help: the trait `PartialEq<Bar<'b, 'static>>` is not implemented for `&i32` - = help: the following other types implement trait `PartialEq<Rhs>`: - f32 - f64 - i128 - i16 - i32 - i64 - i8 - isize - and 6 others + = help: the trait `PartialEq` is implemented for `i32` error[E0277]: can't compare `&i32` with `Foo<'static, 'b>` --> $DIR/self-referential-4.rs:11:31 @@ -27,16 +18,7 @@ LL | i | - return type was inferred to be `&i32` here | = help: the trait `PartialEq<Foo<'static, 'b>>` is not implemented for `&i32` - = help: the following other types implement trait `PartialEq<Rhs>`: - f32 - f64 - i128 - i16 - i32 - i64 - i8 - isize - and 6 others + = help: the trait `PartialEq` is implemented for `i32` error[E0277]: can't compare `&i32` with `Moo<'static, 'a>` --> $DIR/self-referential-4.rs:17:31 @@ -47,16 +29,7 @@ LL | i | - return type was inferred to be `&i32` here | = help: the trait `PartialEq<Moo<'static, 'a>>` is not implemented for `&i32` - = help: the following other types implement trait `PartialEq<Rhs>`: - f32 - f64 - i128 - i16 - i32 - i64 - i8 - isize - and 6 others + = help: the trait `PartialEq` is implemented for `i32` error: aborting due to 3 previous errors diff --git a/src/test/ui/type-alias-impl-trait/self-referential.stderr b/src/test/ui/type-alias-impl-trait/self-referential.stderr index 97d510f68..aff489d70 100644 --- a/src/test/ui/type-alias-impl-trait/self-referential.stderr +++ b/src/test/ui/type-alias-impl-trait/self-referential.stderr @@ -8,16 +8,7 @@ LL | i | - return type was inferred to be `&i32` here | = help: the trait `PartialEq<Bar<'b, 'a>>` is not implemented for `&i32` - = help: the following other types implement trait `PartialEq<Rhs>`: - f32 - f64 - i128 - i16 - i32 - i64 - i8 - isize - and 6 others + = help: the trait `PartialEq` is implemented for `i32` error[E0277]: can't compare `&i32` with `(i32, &i32)` --> $DIR/self-referential.rs:12:31 @@ -29,16 +20,7 @@ LL | (42, i) | ------- return type was inferred to be `(i32, &i32)` here | = help: the trait `PartialEq<(i32, &i32)>` is not implemented for `&i32` - = help: the following other types implement trait `PartialEq<Rhs>`: - f32 - f64 - i128 - i16 - i32 - i64 - i8 - isize - and 6 others + = help: the trait `PartialEq` is implemented for `i32` error[E0277]: can't compare `&i32` with `(i32, Moo<'b, 'a>::{opaque#0})` --> $DIR/self-referential.rs:19:31 @@ -50,16 +32,7 @@ LL | (42, i) | ------- return type was inferred to be `(i32, &i32)` here | = help: the trait `PartialEq<(i32, Moo<'b, 'a>::{opaque#0})>` is not implemented for `&i32` - = help: the following other types implement trait `PartialEq<Rhs>`: - f32 - f64 - i128 - i16 - i32 - i64 - i8 - isize - and 6 others + = help: the trait `PartialEq` is implemented for `i32` error: aborting due to 3 previous errors diff --git a/src/test/ui/type-alias-impl-trait/self_implication.rs b/src/test/ui/type-alias-impl-trait/self_implication.rs new file mode 100644 index 000000000..4e805ee30 --- /dev/null +++ b/src/test/ui/type-alias-impl-trait/self_implication.rs @@ -0,0 +1,38 @@ +// check-pass + +#![feature(type_alias_impl_trait)] +fn foo() { + struct Foo<'a> { + x: &'a mut u8, + } + impl<'a> Foo<'a> { + fn foo(&self) -> impl Sized {} + } + // use site + let mut x = 5; + let y = Foo { x: &mut x }; + let z = y.foo(); + let _a = &x; // invalidate the `&'a mut`in `y` + let _b = z; // this should *not* check that `'a` in the type `Foo<'a>::foo::opaque` is live +} + +fn bar() { + struct Foo<'a> { + x: &'a mut u8, + } + + // desugared + type FooX<'a> = impl Sized; + impl<'a> Foo<'a> { + fn foo(&self) -> FooX<'a> {} + } + + // use site + let mut x = 5; + let y = Foo { x: &mut x }; + let z = y.foo(); + let _a = &x; // invalidate the `&'a mut`in `y` + let _b = z; // this should *not* check that `'a` in the type `Foo<'a>::foo::opaque` is live +} + +fn main() {} |