re PR c++/84940 (internal compiler error: in build_value_init_noctor, at cp/init.c:465)

/cp
2018-09-27  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/84940
	* semantics.c (finish_unary_op_expr): Check return value of
	build_x_unary_op for error_mark_node.

/testsuite
2018-09-27  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/84940
	* g++.dg/expr/unary4.C: New.

From-SVN: r264664

gcc/cp/ChangeLog

+2018-09-27  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/84940
+	* semantics.c (finish_unary_op_expr): Check return value of
+	build_x_unary_op for error_mark_node.
+
 2018-09-25  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/87398

gcc/cp/semantics.c

@@ -2727,13 +2727,14 @@ finish_unary_op_expr (location_t op_loc, enum tree_code code, cp_expr expr,
   /* TODO: build_x_unary_op doesn't always honor the location.  */
   result.set_location (combined_loc);
 
-  tree result_ovl, expr_ovl;
+  if (result == error_mark_node)
+    return result;
 
   if (!(complain & tf_warning))
     return result;
 
-  result_ovl = result;
-  expr_ovl = expr;
+  tree result_ovl = result;
+  tree expr_ovl = expr;
 
   if (!processing_template_decl)
     expr_ovl = cp_fully_fold (expr_ovl);

gcc/testsuite/ChangeLog

+2018-09-27  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/84940
+	* g++.dg/expr/unary4.C: New.
+
 2018-09-26  Indu Bhagat  <indu.bhagat@oracle.com>
 
 	PR gcov-profile/86957

gcc/testsuite/g++.dg/expr/unary4.C

+// PR c++/84940
+// { dg-additional-options -Wno-vla }
+
+void
+foo (int x)
+{
+  struct {} a[1][x](-a[0]); // { dg-error "wrong type argument to unary minus" }
+}