src/test/ui/impl-trait/impl-generic-mismatch.rs

   1 use std::fmt::Debug;
   2
   3 trait Foo {
   4     fn foo(&self, _: &impl Debug);
   5 }
   6
   7 impl Foo for () {
   8     fn foo<U: Debug>(&self, _: &U) { }
   9     //~^ Error method `foo` has incompatible signature for trait
  10 }
  11
  12 trait Bar {
  13     fn bar<U: Debug>(&self, _: &U);
  14 }
  15
  16 impl Bar for () {
  17     fn bar(&self, _: &impl Debug) { }
  18     //~^ Error method `bar` has incompatible signature for trait
  19 }
  20
  21 // With non-local trait (#49841):
  22
  23 use std::hash::{Hash, Hasher};
  24
  25 struct X;
  26
  27 impl Hash for X {
  28     fn hash(&self, hasher: &mut impl Hasher) {}
  29     //~^ Error method `hash` has incompatible signature for trait
  30 }
  31
  32 fn main() {}