re PR c++/71440 (ICE on invalid C++ code in instantiate_type, at cp/class.c:8247)

/cp
2017-08-03  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/71440
	* typeck.c (build_x_unary_op): Avoid pretty-printing constructor /
	destructor as expressions.

/testsuite
2017-08-03  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/71440
	* g++.dg/template/crash127.C: New.

From-SVN: r250848

gcc/cp/ChangeLog

+2017-08-03  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/71440
+	* typeck.c (build_x_unary_op): Avoid pretty-printing constructor /
+	destructor as expressions.
+
 2017-08-02  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/81640

gcc/cp/typeck.c

@@ -5487,9 +5487,9 @@ build_x_unary_op (location_t loc, enum tree_code code, cp_expr xarg,
 	    {
 	      if (complain & tf_error)
 		error (DECL_CONSTRUCTOR_P (fn)
-		       ? G_("taking address of constructor %qE")
-		       : G_("taking address of destructor %qE"),
-		       xarg.get_value ());
+		       ? G_("taking address of constructor %qD")
+		       : G_("taking address of destructor %qD"),
+		       fn);
 	      return error_mark_node;
 	    }
 	}

gcc/testsuite/ChangeLog

+2017-08-03  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/71440
+	* g++.dg/template/crash127.C: New.
+
 2017-08-03  Jakub Jelinek  <jakub@redhat.com>
 
 	PR middle-end/81052

gcc/testsuite/g++.dg/template/crash127.C

+// PR c++/71440
+
+struct A 
+{
+  void f () {}
+};
+
+typedef void (A::*Ptr) ();
+
+template < Ptr > struct B {};
+
+template < class T > 
+struct C : public A
+{
+  void bar ()
+  {
+    B < &A::A > b;  // { dg-error "taking address of constructor 'A::A" "" { target c++98_only } }
+    // { dg-error "taking address of constructor 'constexpr A::A" "" { target c++11 } .-1 }
+  }
+};
+
+template class C < int >;