| // Copyright 2015 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 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| pub trait Parser { |
| type Input; |
| } |
| |
| pub struct Iter<P: Parser>(P, P::Input); |
| |
| pub struct Map<P, F>(P, F); |
| impl<P, F> Parser for Map<P, F> where F: FnMut(P) { |
| type Input = u8; |
| } |
| |
| trait AstId { type Untyped; } |
| impl AstId for u32 { type Untyped = u32; } |
| |
| fn record_type<Id: AstId>(i: Id::Untyped) -> u8 { |
| Iter(Map(i, |_: Id::Untyped| {}), 42).1 |
| } |
| |
| pub fn main() { |
| assert_eq!(record_type::<u32>(3), 42); |
| } |
