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Section 7 of the manual ("Incompatibilities with the Previous
Version") covers it fairly well at the moment:

On Fri, Jan 23, 2009 at 5:14 PM, Tim Mensch <> wrote:
> Peter Cawley wrote:
>> 3: The luaopen_* methods cannot be called directly from C; they should
>> be called as Lua C functions like so:
>> lua_pushcfunction(L, luaopen_io);
> I had this issue myself a week ago when I finally upgraded from 5.0 to 5.1,
> and it took a bit of digging in the manual to figure out why it was dying.
> Would it be worthwhile to change the error message to include an explanation
> of the likely cause? Even if it were just a reference to a manual page, or
> something implying that an internal Lua function was being incorrectly
> called from C, that would prevent confusion (and wasted time, either my time
> digging through the manual, or the time of folks on the list answering
> questions that wouldn't need to be asked).
> Just a thought,
> Tim