src/test/ui/impl-trait/bound-normalization-fail.stderr

   1 warning: the feature `impl_trait_in_bindings` is incomplete and may not be safe to use and/or cause compiler crashes
   2   --> $DIR/bound-normalization-fail.rs:4:12
   3    |
   4 LL | #![feature(impl_trait_in_bindings)]
   5    |            ^^^^^^^^^^^^^^^^^^^^^^
   6    |
   7    = note: `#[warn(incomplete_features)]` on by default
   8    = note: see issue #63065 <https://github.com/rust-lang/rust/issues/63065> for more information
   9
  10 error[E0271]: type mismatch resolving `<Foo<()> as FooLike>::Output == <T as impl_trait::Trait>::Assoc`
  11   --> $DIR/bound-normalization-fail.rs:27:32
  12    |
  13 LL |     fn foo_fail<T: Trait>() -> impl FooLike<Output=T::Assoc> {
  14    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `()`, found associated type
  15    |
  16    = note:         expected type `()`
  17            found associated type `<T as impl_trait::Trait>::Assoc`
  18    = note: the return type of a function must have a statically known size
  19 help: consider constraining the associated type `<T as impl_trait::Trait>::Assoc` to `()`
  20    |
  21 LL |     fn foo_fail<T: Trait<Assoc = ()>>() -> impl FooLike<Output=T::Assoc> {
  22    |                         ^^^^^^^^^^^^
  23
  24 error: `impl Trait` return type cannot contain a projection or `Self` that references lifetimes from a parent scope
  25   --> $DIR/bound-normalization-fail.rs:43:41
  26    |
  27 LL |     fn foo2_fail<'a, T: Trait<'a>>() -> impl FooLike<Output=T::Assoc> {
  28    |                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  29
  30 error[E0271]: type mismatch resolving `<Foo<()> as FooLike>::Output == <T as lifetimes::Trait<'static>>::Assoc`
  31   --> $DIR/bound-normalization-fail.rs:43:41
  32    |
  33 LL |     fn foo2_fail<'a, T: Trait<'a>>() -> impl FooLike<Output=T::Assoc> {
  34    |                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `()`, found associated type
  35    |
  36    = note:         expected type `()`
  37            found associated type `<T as lifetimes::Trait<'static>>::Assoc`
  38    = note: the return type of a function must have a statically known size
  39 help: consider constraining the associated type `<T as lifetimes::Trait<'static>>::Assoc` to `()`
  40    |
  41 LL |     fn foo2_fail<'a, T: Trait<'a, Assoc = ()>>() -> impl FooLike<Output=T::Assoc> {
  42    |                                 ^^^^^^^^^^^^
  43
  44 error: aborting due to 3 previous errors; 1 warning emitted
  45
  46 For more information about this error, try `rustc --explain E0271`.