Mark,
What's a "C++ comment"? If you mean //...\n comments, those are legal in ANSI-99 C (and the syntax goes back to BCPL). If the coding standard specifies multiline-style comments only, fine, but please don't use misleading terminology.
In my own defence, I was using terminology from pdd07, namely: Code Structure The following must apply: ยท C code must use C-style comments only, i.e. "/* comment */". (Not all C compilers handle C++-style comments.) And the files I patched failed the t/codingstd/cppcomments.t test when pmc files are added to the test. Apologies for causing confusion. Regards, Paul