Bug in M4

[Sam Lauber]

I was using GNU M4 1.4.2, and typed in the following recursive additive macro:

define(`add', `ifelse($1, 0, $2, add(decr($1), incr($2))')

I then typed `add(1, 1)'. Obviously, I expected it to say `2', but it said

`Recursion limit of 250 exceeded; use -L<N> to change'

I consider this a bug, because though this _is_ a recursive alogrithm,
I don't think it would recurse 250 times over adding 1 + 1.

Samuel Lauber

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