// MIR for `index_custom` after built

fn index_custom(_1: &WithSliceTail, _2: usize) -> &i32 {
    debug custom => _1;
    debug index => _2;
    let mut _0: &i32;
    let _3: &i32;
    let _4: usize;
    let mut _5: *const [i32];
    let mut _6: usize;
    let mut _7: bool;

    bb0: {
        StorageLive(_3);
        StorageLive(_4);
        _4 = copy _2;
        _5 = &raw const (fake) ((*_1).1: [i32]);
        _6 = PtrMetadata(move _5);
        _7 = Lt(copy _4, copy _6);
        assert(move _7, "index out of bounds: the length is {} but the index is {}", move _6, copy _4) -> [success: bb1, unwind: bb2];
    }

    bb1: {
        _3 = &((*_1).1: [i32])[_4];
        _0 = &(*_3);
        StorageDead(_4);
        StorageDead(_3);
        return;
    }

    bb2 (cleanup): {
        resume;
    }
}