default:
        return (true);
    }
}
static bool _teleportation_check(const spell_type spell)
{
    switch (spell)
    {
    case SPELL_BLINK:
    case SPELL_TELEPORT_SELF:
        return (!scan_artefacts(ARTP_PREVENT_TELEPORTATION));

    // Don't attempt to transform the player if the transformation will fail.

    // Don't attempt to teleport the player if the teleportation will
    // fail.
    if (!_teleportation_check(spell))
        return (XOM_DID_NOTHING);
    // Don't attempt to transform the player if the transformation will
    // fail.

        if (scan_artefacts(ARTP_PREVENT_TELEPORTATION))

        if (!_teleportation_check(SPELL_TELEPORT_SELF))

        // explored (presumably cleared). Even then, it may occasionally
        // happen.

        // explored (presumably cleared).  Even then, it may
        // occasionally happen.

        // The Xom teleportation train takes you on instant teleportation
        // to a few random areas, stopping randomly but most likely in
        // an area that is not dangerous to you.

        // The Xom teleportation train takes you on instant
        // teleportation to a few random areas, stopping randomly but
        // most likely in an area that is not dangerous to you.

            if (scan_artefacts(ARTP_PREVENT_TELEPORTATION))

            if (!_teleportation_check(SPELL_TELEPORT_SELF))

        you.teleport(true);

        you_teleport_now(false);