gistfile1.txt

wut.rs:11:1: 23:2 error: type parameter `__S` must also appear as a type parameter of some type defined within this crate
wut.rs:11 impl <__S: ::serialize::Encoder> ::serialize::Encodable<__S> for Foo {
wut.rs:12     fn encode(&self, __arg_0: &mut __S)
wut.rs:13      -> ::std::result::Result<(), ::__S::Error> {
wut.rs:14         match *self {
wut.rs:15             Foo(ref __self_0_0) =>
wut.rs:16             __arg_0.emit_struct("Foo", 1u, |_e| {
          ...
wut.rs:11:1: 23:2 note: for a limited time, you can add `#![feature(old_orphan_check)]` to your crate to disable this rule                                                         
wut.rs:11 impl <__S: ::serialize::Encoder> ::serialize::Encodable<__S> for Foo {
wut.rs:12     fn encode(&self, __arg_0: &mut __S)
wut.rs:13      -> ::std::result::Result<(), ::__S::Error> {
wut.rs:14         match *self {
wut.rs:15             Foo(ref __self_0_0) =>
wut.rs:16             __arg_0.emit_struct("Foo", 1u, |_e| {
          ...
error: aborting due to previous error

wut.rs

#![feature(phase)]
#![no_std]
#![feature(globs)]
#[phase(plugin, link)]
extern crate "std" as std;
extern crate serialize;
#[prelude_import]
use std::prelude::v1::*;
struct Foo(int);
#[automatically_derived]
impl <__S: ::serialize::Encoder> ::serialize::Encodable<__S> for Foo {
    fn encode(&self, __arg_0: &mut __S)
     -> ::std::result::Result<(), ::__S::Error> {
        match *self {
            Foo(ref __self_0_0) =>
            __arg_0.emit_struct("Foo", 1u, |_e| {
                                return _e.emit_struct_field("_field0", 0u,
                                                            |_e|
                                                                (*__self_0_0).encode(_e));
                            }),
        }
    }
}