[C++ Patch/RFC] PR 58582

[Paolo Carlini <paolo dot carlini at oracle dot com>]

Hi,

this relatively old bug report is about an ICE during error recovery and 
some time ago I figured out that the below simple tweak to grokfndecl 
worked for it (we notice that duplicate_decls returned error_mark_node). 
Today, however, while formatting the original testcases, I noticed 
something slightly more interesting: at variance with both current clang 
and icc, we reject the below deleted6.C, thus we reject explicit 
instantiations of deleted template functions (without explaining that 
the function is deleted in the error message and still accepting the 
code with -fpermissive (?)). Thus the below tweak to instantiate_decl. 
Without it, 58582 is still fixed of course, only the testcases need a 
little adjusting.

Tested x86_64-linux.

Thanks,
Paolo.

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