re PR c++/80296 (Broken diagnostic 'unary_plus_expr' not supported by expression)

        PR c++/80296
        * cxx-pretty-print.c (cxx_pretty_printer::expression): Add
        UNARY_PLUS_EXPR case.

        * g++.dg/cpp0x/alias-decl-80296.C: New test.

From-SVN: r246683

gcc/cp/ChangeLog

+2017-04-04  Volker Reichelt  <v.reichelt@netcologne.de>
+
+	PR c++/80296
+	* cxx-pretty-print.c (cxx_pretty_printer::expression): Add
+	UNARY_PLUS_EXPR case.
+
 2017-04-03  Jason Merrill  <jason@redhat.com>
 
 	* semantics.c (finish_template_type): Check CLASSTYPE_TEMPLATE_INFO.

gcc/cp/cxx-pretty-print.c

@@ -1112,6 +1112,7 @@ cxx_pretty_printer::expression (tree t)
     case SIZEOF_EXPR:
     case ALIGNOF_EXPR:
     case NOEXCEPT_EXPR:
+    case UNARY_PLUS_EXPR:
       unary_expression (t);
       break;
 

gcc/testsuite/ChangeLog

+2017-04-04  Volker Reichelt  <v.reichelt@netcologne.de>
+
+	PR c++/80296
+	* g++.dg/cpp0x/alias-decl-80296.C: New test.
+
 2017-04-04  Thomas Preud'homme  <thomas.preudhomme@arm.com>
 
 	PR target/80307

gcc/testsuite/g++.dg/cpp0x/alias-decl-80296.C

+// { dg-do compile { target c++11 } }
+// { dg-bogus "not supported by" "" { target *-*-* } 0 }
+
+template <int...> struct A {};
+
+template <int... N> using B = A<+N...>;
+
+B<int> b; // { dg-error "type/value mismatch" }
+          // { dg-message "expected a constant" "expected" { target *-*-* } 8 }