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use std::fmt::Debug;
trait Foo {
fn foo(&self, _: &impl Debug);
}
impl Foo for () {
fn foo<U: Debug>(&self, _: &U) { }
//~^ Error method `foo` has incompatible signature for trait
}
trait Bar {
fn bar<U: Debug>(&self, _: &U);
}
impl Bar for () {
fn bar(&self, _: &impl Debug) { }
//~^ Error method `bar` has incompatible signature for trait
}
trait Baz {
fn baz<U: Debug, T: Debug>(&self, _: &U, _: &T);
}
impl Baz for () {
fn baz<T: Debug>(&self, _: &impl Debug, _: &T) { }
//~^ Error method `baz` has incompatible signature for trait
}
// With non-local trait (#49841):
use std::hash::{Hash, Hasher};
struct X;
impl Hash for X {
fn hash(&self, hasher: &mut impl Hasher) {}
//~^ Error method `hash` has incompatible signature for trait
}
fn main() {}
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