aee69073cd
When determining the most specialized partial specialization of a primary template that is nested inside a class template, we first tsubst the outer template arguments into the TEMPLATE_DECL of each partial specialization, and then check for satisfaction of each of the new TEMPLATE_DECL's constraints. But tsubst_template_decl does not currently guarantee that constraints from the original DECL_TEMPLATE_RESULT get reattached to the new DECL_TEMPLATE_RESULT. In the testcase below, this leads to the constraints_satisfied_p check in most_specialized_partial_spec to trivially return true for each of the partial specializations. I'm not sure if such a guarantee would be desirable, but in this case we can just check constraints_satisfied_p on the original TEMPLATE_DECL instead of on the tsubsted TEMPLATE_DECL here, which is what this patch does (alongside some reorganizing). gcc/cp/ChangeLog: PR c++/92103 * pt.c (most_specialized_partial_spec): Reorganize the loop over DECL_TEMPLATE_SPECIALIZATIONS. Check constraints_satisfied_p on the original template declaration, not on the tsubsted one. gcc/testsuite/ChangeLog: PR c++/92103 * g++.dg/cpp2a/concepts-partial-spec7.C: New test. |
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