rust/src/test/run-pass/issue-3979-generics.rs
Tim Chevalier a30ea013f5 Handle supertrait calls in default methods
Add a new method_super origin for supertrait methods. Also make
coherence create a table that maps pairs of trait IDs and self types
to impl IDs, so that it's possible to check a supertrait method
knowing only its index in its trait's methods (without knowing all
supertraits for a given trait).

r=nmatsakis and graydon -- with hope, we'll revamp all of this code as
per #4678, but for now this fixes the bug.

Closes #3979
2013-01-29 20:33:22 -08:00

42 lines
974 B
Rust

// Copyright 2012 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.
// xfail-test
trait Positioned<S> {
fn SetX(&self, S);
fn X(&self) -> S;
}
#[allow(default_methods)]
trait Movable<S, T>: Positioned<T> {
fn translate(&self, dx: T) {
self.SetX(self.X() + dx);
}
}
struct Point { mut x: int, mut y: int }
impl Point: Positioned<int> {
fn SetX(&self, x: int) {
self.x = x;
}
fn X(&self) -> int {
self.x
}
}
impl Point: Movable<int, int>;
fn main() {
let p = Point{ x: 1, y: 2};
p.translate(3);
assert p.X() == 4;
}