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[Bug preprocessor/58844] [4.8 Regression] ICE with invalid use of ##


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58844

--- Comment #13 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
Also, in the case of just two consecutive ##, with a placemarker either 
side, I think however you read it the concatenations are currently valid 
and you end up with no preprocessing tokens in the expansion.

#define m(a,b) a####b
m(,)


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