src/test/ui/impl-trait/issue-55872-1.stderr

   1 error[E0277]: the trait bound `S: std::marker::Copy` is not satisfied in `(S, T)`
   2   --> $DIR/issue-55872-1.rs:12:5
   3    |
   4 LL |     type E = impl Copy;
   5    |     ^^^^^^^^^^^^^^^^^^^ within `(S, T)`, the trait `std::marker::Copy` is not implemented for `S`
   6    |
   7    = note: required because it appears within the type `(S, T)`
   8    = note: the return type of a function must have a statically known size
   9 help: consider further restricting this bound
  10    |
  11 LL | impl<S: Default + std::marker::Copy> Bar for S {
  12    |                 ^^^^^^^^^^^^^^^^^^^
  13
  14 error[E0277]: the trait bound `T: std::marker::Copy` is not satisfied in `(S, T)`
  15   --> $DIR/issue-55872-1.rs:12:5
  16    |
  17 LL |     type E = impl Copy;
  18    |     ^^^^^^^^^^^^^^^^^^^ within `(S, T)`, the trait `std::marker::Copy` is not implemented for `T`
  19    |
  20    = note: required because it appears within the type `(S, T)`
  21    = note: the return type of a function must have a statically known size
  22 help: consider further restricting this bound
  23    |
  24 LL |     fn foo<T: Default + std::marker::Copy>() -> Self::E {
  25    |                       ^^^^^^^^^^^^^^^^^^^
  26
  27 error: type parameter `T` is part of concrete type but not used in parameter list for the `impl Trait` type alias
  28   --> $DIR/issue-55872-1.rs:16:37
  29    |
  30 LL |       fn foo<T: Default>() -> Self::E {
  31    |  _____________________________________^
  32 LL | |
  33 LL | |         (S::default(), T::default())
  34 LL | |     }
  35    | |_____^
  36
  37 error: aborting due to 3 previous errors
  38
  39 For more information about this error, try `rustc --explain E0277`.