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#![feature(const_trait_impl)] #[const_trait] trait ConstDefaultFn: Sized { fn b(self); fn a(self) { self.b(); } } struct NonConstImpl; struct ConstImpl; impl ConstDefaultFn for NonConstImpl { fn b(self) {} } impl const ConstDefaultFn for ConstImpl { fn b(self) {} } const fn test() { NonConstImpl.a(); //~^ ERROR the trait bound ConstImpl.a(); } fn main() {}