rust/src/test/run-pass/static-impl.rs

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import a::*;
import b::baz;
mod a {
impl foo for uint { fn plus() -> int { self as int + 20 } }
}
mod b {
impl baz for str { fn plus() -> int { 200 } }
}
impl util for uint {
fn str() -> str { uint::str(self) }
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fn times(f: fn(uint)) {
let mut c = 0u;
while c < self { f(c); c += 1u; }
}
}
impl util<T> for [T] {
fn length() -> uint { vec::len(self) }
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fn iter(f: fn(T)) { for x in self { f(x); } }
fn map<U>(f: fn(T) -> U) -> [U] {
let mut r = [];
for elt in self { r += [f(elt)]; }
r
}
}
fn main() {
impl foo for int { fn plus() -> int { self + 10 } }
assert 10.plus() == 20;
assert 10u.plus() == 30;
assert "hi".plus() == 200;
assert [1].length().str() == "1";
assert [3, 4].map({|a| a + 4})[0] == 7;
assert [3, 4].map::<uint>({|a| a as uint + 4u})[0] == 7u;
let mut x = 0u;
10u.times {|_n| x += 2u;}
assert x == 20u;
}