[C++ Patch] PR 60999

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

Hi,

this regression unfortunately has to do with my fix for c++/57887, thus 
the code in maybe_begin_member_template_processing:

   if (nsdmi)
     decl = (CLASSTYPE_TEMPLATE_INFO (DECL_CONTEXT (decl))
         ? CLASSTYPE_TI_TEMPLATE (DECL_CONTEXT (decl))
         : NULL_TREE);

The check is true for the new testcase and we end up with an 
unsubstituted STATIC_CAST_EXPR which leads to an ICE in 
cxx_eval_constant_expression. Having tried a number of ideas (by now we 
have got quite a few testcases in this area), I think it makes sense to 
check uses_template_parms too on DECL_CONTEXT (decl): when it returns 
false I don't think we may run into uses of template parms a la 
c++/57887 and we are back to the status pre- that fix in nsdmi handling.

Tested x86_64-linux.

Thanks,
Paolo.

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Attachment: patch_60999
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