comma operator causes hard to spot bugs

[Manfred Nowak]

David Nadlinger wrote:

> quite a bit more fruitless than the one you were commenting on

May be. But then a definition of fruitfullness is missing.

Walter once changed the language because a change of a "." to a "," or 
vice versa might change an actual parameter list from
|  (1,2.3)
to
|  (1,2,3)

That is a distance of zero for characters and token.

The problem presented here shows distances of about twenty characters 
or four token.

Does fruitfullness reach up to hundred characters or ten tokens? Please 
specify the upper bound.

-manfred