51 lines
1.3 KiB
Rust
51 lines
1.3 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// xfail-fast
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#[legacy_modes];
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trait to_str {
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fn to_str() -> ~str;
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}
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impl int: to_str {
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fn to_str() -> ~str { int::str(self) }
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}
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impl ~str: to_str {
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fn to_str() -> ~str { copy self }
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}
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impl (): to_str {
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fn to_str() -> ~str { ~"()" }
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}
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trait map<T> {
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fn map<U: Copy>(f: fn(T) -> U) -> ~[U];
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}
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impl<T> ~[T]: map<T> {
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fn map<U: Copy>(f: fn(T) -> U) -> ~[U] {
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let mut r = ~[];
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for self.each |x| { r += ~[f(*x)]; }
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r
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}
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}
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fn foo<U, T: map<U>>(x: T) -> ~[~str] {
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x.map(|_e| ~"hi" )
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}
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fn bar<U: to_str, T: map<U>>(x: T) -> ~[~str] {
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x.map(|_e| _e.to_str() )
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}
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pub fn main() {
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assert foo(~[1]) == ~[~"hi"];
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assert bar::<int, ~[int]>(~[4, 5]) == ~[~"4", ~"5"];
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assert bar::<~str, ~[~str]>(~[~"x", ~"y"]) == ~[~"x", ~"y"];
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assert bar::<(), ~[()]>(~[()]) == ~[~"()"];
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}
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