[patch] Fix PR c++/27668

[Eric Botcazou]

> The differences between the code on the 4.1 branch and on mainline
> existed before I applied my patch. The only addition I made was to
> check for TREE_VEC_ELT (parms, nargs) against error_mark_node which I
> applied to both, the rest of the conditional I left alone.

OK, thanks for the clarification.  Then we have an interesting conflict 
between rule #7 (only do minimal changes) and rule #13 (minimize differences 
between branches) of the Compiler Writer's Guide. :-)

-- 
Eric Botcazou