[Bug preprocessor/89665] inconsistent macro expansion

[gciofono at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89665

--- Comment #2 from Giacinto Cifelli <gciofono at gmail dot com> ---
It mentions the following:
"A parameter in the replacement list, unless preceded by a # or ##
preprocessing token or followed by a ## preprocessing token (see below), is
replaced by the corresponding argument after all macros contained therein have
been expanded."
(in a 2005 free draft on internet from WG14, but I have hopes that the official
ISO document hasn't changed this)

So, this is not really helpful. It can lead to the current lazy expansion or to
the expansion of each argument each time it is used, or possibly to the
pre-expansion of the list of parameters. All options are possible.