luaL_where
[-0, +1, m]
void luaL_where (lua_State *L, int lvl);
Pushes onto the stack a string identifying the current position of the control at level lvl
in the call stack. Typically this string has the following format:
chunkname:currentline:
Level 0 is the running function, level 1 is the function that called the running function, etc.
This function is used to build a prefix for error messages.
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