PR c++/85279 - dump_expr doesn't understand decltype.

	* error.c (dump_expr): Handle DECLTYPE_TYPE.

From-SVN: r259257

gcc/cp/ChangeLog

 2018-04-09  Jason Merrill  <jason@redhat.com>
 
+	PR c++/85279 - dump_expr doesn't understand decltype.
+	* error.c (dump_expr): Handle DECLTYPE_TYPE.
+
 	PR c++/85262 - ICE with redundant qualification on constructor.
 	* call.c (build_new_method_call_1): Move make_args_non_dependent
 	after A::A() handling.

gcc/cp/error.c

@@ -2714,6 +2714,7 @@ dump_expr (cxx_pretty_printer *pp, tree t, int flags)
     case INTEGER_TYPE:
     case COMPLEX_TYPE:
     case VECTOR_TYPE:
+    case DECLTYPE_TYPE:
       pp_type_specifier_seq (pp, t);
       break;
 

gcc/testsuite/g++.dg/cpp0x/decltype67.C

+// PR c++/85279
+// { dg-do compile { target c++11 } }
+
+template<typename T> struct A
+{
+  void foo(decltype(T())::Y);	// { dg-error {decltype\(T\(\)\)::Y} }
+};