src/test/ui/specialization/issue-50452-fail.stderr

   1 warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
   2   --> $DIR/issue-50452-fail.rs:1:12
   3    |
   4 LL | #![feature(specialization)]
   5    |            ^^^^^^^^^^^^^^
   6    |
   7    = note: `#[warn(incomplete_features)]` on by default
   8    = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
   9    = help: consider using `min_specialization` instead, which is more stable and complete
  10
  11 error[E0520]: `foo` specializes an item from a parent `impl`, but that item is not marked `default`
  12   --> $DIR/issue-50452-fail.rs:10:5
  13    |
  14 LL |       fn foo() {}
  15    |       ^^^^^^^^^^^ cannot specialize default item `foo`
  16 ...
  17 LL | / impl<T> Foo for T {
  18 LL | |     fn foo() {}
  19 LL | | }
  20    | |_- parent `impl` is here
  21    |
  22    = note: to specialize, `foo` in the parent `impl` must be marked `default`
  23
  24 error: aborting due to previous error; 1 warning emitted
  25
  26 For more information about this error, try `rustc --explain E0520`.