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users of my application are calling for detailed error tracking in lua scripts. For now I just register the _ERRORMESSAGE by

// redirect the error handling 
lua_register(L, "_ERRORMESSAGE", error);

// error handling routine
static int error(lua_State * L)
    DisplayError( lua_tostring(L, 1) );
    return 0;

Is there any way how to get also the line number in script which has caused an error?