// Returns index of the trap for a given (x,y) coordinate pair {dlb}
int trap_at_xy(const coord_def& xy)
{
    for (int which_trap = 0; which_trap < MAX_TRAPS; which_trap++)
    {
        if (env.trap[which_trap].pos == xy
            && env.trap[which_trap].type != TRAP_UNASSIGNED)
        {
            return (which_trap);
        }
    }
    // No idea how well this will be handled elsewhere. {dlb}
    return (-1);
}
trap_type trap_type_at_xy(const coord_def& xy)
{
    const int idx = trap_at_xy(xy);
    return (idx == -1 ? NUM_TRAPS : env.trap[idx].type);
}

        return _tileidx_trap(trap_type_at_xy(coord_def(gx, gy)));

        return _tileidx_trap(get_trap_type(coord_def(gx, gy)));