[C++ Patch] PR 58596

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

Hi,

in this ICE on valid, 4.8/4.9 Regression, the problem is that, for a 
lambda in an NSDMI context, the early return of lambda_expr_this_capture:

   /* In unevaluated context this isn't an odr-use, so just return the
      nearest 'this'.  */
   if (cp_unevaluated_operand)
     return lookup_name (this_identifier);

fails to find a this_identifier. This is expected, in a NSDMI context, 
as also clarified from the comment a few lines below. Thus I'm handling 
the issue the same way, that is by way of scope_chain->x_current_class_ptr.

Tested x86_64-linux.

Thanks!
Paolo.

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Attachment: patch_58596
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