[Bug preprocessor/20262] __LINE__ implementation flaky.

[gromer at google dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20262

Geoff Romer <gromer at google dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |gromer at google dot com

--- Comment #5 from Geoff Romer <gromer at google dot com> ---
The issue isn't the flexibility in "presumed", it's the flexibility in "source
line": the standard defines line number in terms of the "current token", but
gives no explicit guidance about which token is considered "current" in a case
like this, where the preprocessor is arguably expanding two different macros at
the same time.