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Diffstat (limited to 'tests/ui/traits/superdefault-generics.rs')
-rw-r--r-- | tests/ui/traits/superdefault-generics.rs | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/tests/ui/traits/superdefault-generics.rs b/tests/ui/traits/superdefault-generics.rs new file mode 100644 index 000000000..e862c0e97 --- /dev/null +++ b/tests/ui/traits/superdefault-generics.rs @@ -0,0 +1,39 @@ +// run-pass +#![allow(dead_code)] +#![allow(non_snake_case)] + +// There is some other borrowck bug, so we make the stuff not mut. + + +use std::ops::Add; + +trait Positioned<S> { + fn SetX(&mut self, _: S); + fn X(&self) -> S; +} + +trait Movable<S: Add<Output=S>>: Positioned<S> { + fn translate(&mut self, dx: S) { + let x = self.X() + dx; + self.SetX(x); + } +} + +struct Point<S> { x: S, y: S } + +impl<S: Clone> Positioned<S> for Point<S> { + fn SetX(&mut self, x: S) { + self.x = x; + } + fn X(&self) -> S { + self.x.clone() + } +} + +impl<S: Clone + Add<Output=S>> Movable<S> for Point<S> {} + +pub fn main() { + let mut p = Point{ x: 1, y: 2}; + p.translate(3); + assert_eq!(p.X(), 4); +} |