error[E0276]: impl has stricter requirements than trait
  --> $DIR/E0276.rs:16:5
   |
12 |     fn foo<T>(x: T);
   |     ---------------- definition of `foo` from trait
...
16 |     fn foo<T>(x: T) where T: Copy {} //~ ERROR E0276
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ impl has extra requirement `T: std::marker::Copy`

error: aborting due to previous error

If you want more information on this error, try using "rustc --explain E0276"