// Copyright 2016 The Rust Project Developers. See the COPYRIGHT // file at the top-level directory of this distribution and at // http://rust-lang.org/COPYRIGHT. // // Licensed under the Apache License, Version 2.0 or the MIT license // , at your // option. This file may not be copied, modified, or distributed // except according to those terms. #![feature(specialization)] trait SpaceLlama { fn fly(&self); } impl SpaceLlama for T { default fn fly(&self) {} } impl SpaceLlama for T { //~^ NOTE parent `impl` is here fn fly(&self) {} } impl SpaceLlama for i32 { default fn fly(&self) {} //~^ ERROR E0520 //~| NOTE cannot specialize default item `fly` //~| NOTE `fly` in the parent `impl` must be marked `default` } fn main() { }