#[doc = "The identity function"]
pure fn id<T: copy>(x: T) -> T { x }

/* FIXME (issue #141):  See test/run-pass/constrained-type.rs.  Uncomment
 * the constraint once fixed. */
#[doc = "A rational number"]
type rational = {num: int, den: int}; // : int::positive(*.den);

pure fn rational_leq(x: rational, y: rational) -> bool {
    // NB: Uses the fact that rationals have positive denominators WLOG:

    x.num * y.den <= y.num * x.den
}

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