Incorrect matching on tuples with value ranges

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If part of a tuple is already "mentioned" in a match (but the match misses because of the rest of the tuple), it then won't match on a later range either, regardless of whether it should.

Best demonstrated by example:

fn main() {
    let x = 1;
    let y = 2;

    let z = match (x,y) {
    (1,1) => 1,
    (2,2) => 2,
    (1..2,2) => 3,
    (_,_) => fail!("Shouldn't reach here but does")
    };
}