Function dfhack_exit_error

library/LuaTools.cpp:696–704

replaces os.exit with a thrown exception

// replaces os.exit with a thrown exception
static int dfhack_exit_error(lua_State *L)
{
    int exit_code = luaL_checkint(L, 1);
    lua_pop(L, 1);
    lua_pushfstring(L,
                    "prevented execution of os.exit(%d); please use error()"
                    " or qerror() instead.", exit_code);
    return dfhack_error(L);
}

static int dfhack_exception_tostring(lua_State *L)
{