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I thought my earlier fix for 91930 was an obvious bug fix, but apparently an inherited constructor does not count as user-declared. So this patch reverts that change and the other follow-on patches, and fixes 91930 differently, by not letting the inherited default constructor hide the implicitly-declared default constructor. * class.c (add_method): A constrained inherited ctor doesn't hide an implicit derived ctor. Revert: PR c++/91930 - ICE with constrained inherited default ctor. * name-lookup.c (do_class_using_decl): Set TYPE_HAS_USER_CONSTRUCTOR for inherited constructor. PR c++/92552 - ICE with inherited constrained default ctor. * pt.c (instantiate_class_template_1): Copy TYPE_HAS_USER_CONSTRUCTOR. PR c++/92594 - ICE with inherited trivial default ctor. * method.c (trivial_fn_p): Treat an inherited default constructor like a normal default constructor.
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