type point = {x: int, y: int}; impl point_ops for point { fn +(other: point) -> point { {x: self.x + other.x, y: self.y + other.y} } fn -(other: point) -> point { {x: self.x - other.x, y: self.y - other.y} } fn unary-() -> point { {x: -self.x, y: -self.y} } fn [](x: bool) -> int { if x { self.x } else { self.y } } } fn main() { let mut p = {x: 10, y: 20}; p += {x: 101, y: 102}; p -= {x: 100, y: 100}; assert p + {x: 5, y: 5} == {x: 16, y: 27}; assert -p == {x: -11, y: -22}; assert p[true] == 11; assert p[false] == 22; // Issue #1733 fn~(_x: int){}(p[true]); }