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Make a dummy table with metatable and __pairs metamethod in it, make that metamethod return value A, put value B in dummy table.
Now call pairs on it and read first value. If __pairs was invoked, you get A, if not regular pairs will return B 
On 21 Dec 2021, 12:44 +0300, Александр Машин <>, wrote:
Dear all,

Is there a way to find out whether metatable methods __pairs() and
__ipairs() are invoked by pairs() and ipairs() other than
checking _VERSION (my code will be run in an exotic environment)
or probing, i.e. defining such metamethods for a dummy table and
checking, if they are actually called?

Alexander Mashin