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// run-pass #![feature(rustc_private)] extern crate rustc_macros; #[allow(dead_code)] extern crate rustc_serialize; use rustc_macros::{Decodable, Encodable}; #[derive(Decodable, Encodable, Debug)] struct A { a: String, } trait Trait { fn encode(&self); } impl<T> Trait for T { fn encode(&self) { unimplemented!() } } fn main() {}