src/test/run-fail/bug-2470-bounds-check-overflow.rs


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// error-pattern:bounds check

fn main() {

    // This should cause a bounds-check failure, but may not if we do our
    // bounds checking by comparing the scaled index to the vector's
    // address-bounds, since we've scaled the index to wrap around to the
    // address of the 0th cell in the array (even though the index is
    // huge).

    let x = [1u,2u,3u]/~;
    vec::unpack_slice(x) {|p, _len|
        let base = p as uint;                     // base = 0x1230 say
        let idx = base / sys::size_of::<uint>();  // idx  = 0x0246 say
        #error("ov1 base = 0x%x", base);
        #error("ov1 idx = 0x%x", idx);
        #error("ov1 sizeof::<uint>() = 0x%x", sys::size_of::<uint>());
        #error("ov1 idx * sizeof::<uint>() = 0x%x",
               idx * sys::size_of::<uint>());

        // This should fail.
        #error("ov1 0x%x",  x[idx]);
    }
}