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trait Foo<A> { fn foo(&self, a: A) -> A { a } } trait NotRelevant<A> { fn nr(&self, a: A) -> A { a } } struct Bar; impl NotRelevant<usize> for Bar {} fn main() { let f1 = Bar; f1.foo(1usize); //~^ error: method named `foo` found for struct `Bar` in the current scope }