re PR c++/67152 ([concepts] bogus "partial specialization of ‘foo<T>’ after instantiation" error)

	PR c++/67152
	* pt.c (process_partial_specialization): Call
	associate_classtype_constraints.

From-SVN: r226739

gcc/cp/ChangeLog

 2015-08-08  Jason Merrill  <jason@redhat.com>
 
+	PR c++/67152
+	* pt.c (process_partial_specialization): Call
+	associate_classtype_constraints.
+
 	PR c++/67159
 	* constraint.cc (finish_template_introduction):
 	SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT.

gcc/cp/pt.c

@@ -4672,6 +4672,8 @@ process_partial_specialization (tree decl)
     /* We didn't register this in check_explicit_specialization so we could
        wait until the constraints were set.  */
     decl = register_specialization (decl, maintmpl, specargs, false, 0);
+  else
+    associate_classtype_constraints (type);
 
   DECL_TEMPLATE_SPECIALIZATIONS (maintmpl)
     = tree_cons (specargs, tmpl,

gcc/testsuite/g++.dg/concepts/partial-spec6.C

+// PR c++/67152
+// { dg-options -std=c++1z }
+
+template <class T>
+concept bool HasType = requires { typename T::type; };
+
+template<class T>
+struct trait {
+  using type = void;
+};
+
+struct has_type { using type = void; };
+
+// Instantiation here
+trait<has_type>::type foo() {}
+
+// constrained version here. Type "has_type" would fail this
+// constraint so this partial specialization would not have been
+// selected.
+template<class T>
+  requires !HasType<T>
+struct trait<T> {
+  using type = void;
+};