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

   1 warning: the feature `impl_trait_in_bindings` is incomplete and may cause the compiler to crash
   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
   9 error[E0271]: type mismatch resolving `<Foo<()> as FooLike>::Output == <T as impl_trait::Trait>::Assoc`
  10   --> $DIR/bound-normalization-fail.rs:27:32
  11    |
  12 LL |     fn foo_fail<T: Trait>() -> impl FooLike<Output=T::Assoc> {
  13    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `()`, found associated type
  14    |
  15    = note:         expected type `()`
  16            found associated type `<T as impl_trait::Trait>::Assoc`
  17    = note: consider constraining the associated type `<T as impl_trait::Trait>::Assoc` to `()`
  18    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
  19    = note: the return type of a function must have a statically known size
  20
  21 error: `impl Trait` return type cannot contain a projection or `Self` that references lifetimes from a parent scope
  22   --> $DIR/bound-normalization-fail.rs:43:41
  23    |
  24 LL |     fn foo2_fail<'a, T: Trait<'a>>() -> impl FooLike<Output=T::Assoc> {
  25    |                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  26
  27 error[E0271]: type mismatch resolving `<Foo<()> as FooLike>::Output == <T as lifetimes::Trait<'static>>::Assoc`
  28   --> $DIR/bound-normalization-fail.rs:43:41
  29    |
  30 LL |     fn foo2_fail<'a, T: Trait<'a>>() -> impl FooLike<Output=T::Assoc> {
  31    |                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `()`, found associated type
  32    |
  33    = note:         expected type `()`
  34            found associated type `<T as lifetimes::Trait<'static>>::Assoc`
  35    = note: consider constraining the associated type `<T as lifetimes::Trait<'static>>::Assoc` to `()`
  36    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
  37    = note: the return type of a function must have a statically known size
  38
  39 error: aborting due to 3 previous errors
  40
  41 For more information about this error, try `rustc --explain E0271`.