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On Aug 19, 2018, at 4:32 PM, Александр Машин<> wrote:

Deal all,

as far as I understand the documentation on fold captures in LPEG
(, the folding function should
be called if there is at least one capture in the pattern passed to lpeg.Cf ().

However, the real minimum seems to be two.

-- Alexander Masin

Folding take minimum of 2 arguments, maybe more.
However, you can supplied defaults using lpeg.Cc

Your code need 3 + 2k arguments to trigger folding.
Since op is guaranteed a "+" or "-", the last elseif is dead code.

In other words, the code will never reach special case.