https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58844
David Krauss <potswa at mac dot com> changed:
What |Removed |Added
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CC| |potswa at mac dot com
--- Comment #9 from David Krauss <potswa at mac dot com> ---
The fix makes the case well-formed. It's not. A sequence of concatenation
operators is not processed as if they were separated by empty parameters. "A ##
## B" concatenates A with the (second) ## to produce an illegal token "A##".
Clang diagnoses it as such.
