src/test/ui/generic-associated-types/issue-68656-unsized-values.stderr

warning: the feature `generic_associated_types` is incomplete and may not be safe to use and/or cause compiler crashes
  --> $DIR/issue-68656-unsized-values.rs:3:12
   |
LL | #![feature(generic_associated_types)]
   |            ^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `#[warn(incomplete_features)]` on by default
   = note: see issue #44265 <https://github.com/rust-lang/rust/issues/44265> for more information

error[E0271]: type mismatch resolving `<T as std::ops::Deref>::Target == T`
  --> $DIR/issue-68656-unsized-values.rs:16:5
   |
LL |     type Item<'a>: std::ops::Deref<Target = T>;
   |     ------------------------------------------- required by `UnsafeCopy::Item`
...
LL | impl<T: Copy + std::ops::Deref> UnsafeCopy<T> for T {
   |      - this type parameter
LL |     type Item<'a> = T;
   |     ^^^^^^^^^^^^^^^^^^ expected type parameter `T`, found associated type
   |
   = note: expected type parameter `T`
             found associated type `<T as std::ops::Deref>::Target`
help: consider further restricting this bound
   |
LL | impl<T: Copy + std::ops::Deref + std::ops::Deref<Target = T>> UnsafeCopy<T> for T {
   |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error; 1 warning emitted

For more information about this error, try `rustc --explain E0271`.