src/librustc_error_codes/error_codes/E0276.md

   1 A trait implementation has stricter requirements than the trait definition.
   2
   3 Erroneous code example:
   4
   5 ```compile_fail,E0276
   6 trait Foo {
   7     fn foo<T>(x: T);
   8 }
   9
  10 impl Foo for bool {
  11     fn foo<T>(x: T) where T: Copy {}
  12 }
  13 ```
  14
  15 Here, all types implementing `Foo` must have a method `foo<T>(x: T)` which can
  16 take any type `T`. However, in the `impl` for `bool`, we have added an extra
  17 bound that `T` is `Copy`, which isn't compatible with the original trait.
  18
  19 Consider removing the bound from the method or adding the bound to the original
  20 method definition in the trait.