// Tests that default impls do not have to supply all items but regular impls do. #![feature(specialization)] //~ WARN the feature `specialization` is incomplete trait Foo { fn foo_one(&self) -> &'static str; fn foo_two(&self) -> &'static str; } struct MyStruct; default impl Foo for T { fn foo_one(&self) -> &'static str { "generic" } } impl Foo for MyStruct {} //~^ ERROR not all trait items implemented, missing: `foo_two` [E0046] fn main() { println!("{}", MyStruct.foo_one()); }