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 } }
}
fn main() {
impl foo for int { fn plus() -> int { self + 10 } }
assert 10.plus() == 20;
assert 10u.plus() == 30;
assert "hi".plus() == 200;
}