[C++ Patch] PR 58610

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

Hi,

in this regression, we ICE in explain_non_literal_class in:

          if (DECL_DELETED_FN (fn))
            maybe_explain_implicit_delete (fn);

because fn is a TEMPLATE_DECL. Now, if I read the comment which provides 
rationale for LANG_DECL_FN_CHECK:

/* We want to be able to check DECL_CONSTRUCTOR_P and such on a function
   template, not just on a FUNCTION_DECL.  So when looking for things in
   lang_decl_fn, look down through a TEMPLATE_DECL into its result. */
#define LANG_DECL_FN_CHECK(NODE) __extension__                \

I think it could make sense to use the macro for DECL_DELETED_FN too, 
not just for DECL_DEFAULTED_FN. Or do we want something more localized?

Tested x86_64-linux.

Thanks,
Paolo.

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