comma operator causes hard to spot bugs

[Manfred Nowak]

David Nadlinger wrote:

> how similar [...]
> how easy [...]
> Communicating [...] doesn't work that way.

If someone has a usable definition on how to communicate or find 
similarities _easily_ then please show up.

Such a definition is the start for splitting them into possibly 
intended software clones and unintended but syntactically correct 
mishaps.

-manfred