match negative numbers

[Richard Membarth]

Matching a negative number is currently not supported:

fn test(id: i32) -> i32 {
    match id {
        23 => 42,
        -1 => 47,
        _  => 11
    }
}

impala test.impala
test.impala:4 col 9: error: expected identifier, got '-' while parsing path
test.impala:4 col 9: error: expected '=>', got '-' while parsing pattern of match expression

[Arsène Pérard-Gayot]

Fixed in commit fbe615c.