f4acaf6934
We should probalby warn when defining a method foo on {foo: int} etc.
This should reduce the amount of useless typevars that are allocated.
Issue #1227
42 lines
872 B
Rust
42 lines
872 B
Rust
import a::*;
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import b::baz;
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mod a {
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impl foo for uint { fn plus() -> int { self as int + 20 } }
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}
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mod b {
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impl baz for str { fn plus() -> int { 200 } }
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}
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impl util for uint {
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fn str() -> str { uint::str(self) }
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fn times(f: block(uint)) {
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let c = 0u;
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while c < self { f(c); c += 1u; }
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}
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}
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impl util<T> for [T] {
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fn len() -> uint { vec::len(self) }
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fn iter(f: block(T)) { for x in self { f(x); } }
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fn map<U>(f: block(T) -> U) -> [U] {
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let r = [];
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for elt in self { r += [f(elt)]; }
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r
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}
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}
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fn main() {
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impl foo for int { fn plus() -> int { self + 10 } }
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assert 10.plus() == 20;
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assert 10u.plus() == 30;
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assert "hi".plus() == 200;
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assert [1].len().str() == "1";
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assert [3, 4].map({|a| a + 4})[0] == 7;
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let x = 0u;
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10u.times {|_n| x += 2u;}
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assert x == 20u;
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}
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