tests: fix incorrect object construction

Reported by Ken Moffat.
http://lists.gnu.org/archive/html/bug-bison/2013-10/msg00009.html

* tests/c++.at (Exception safety): Here.

NEWS

@@ -4,7 +4,9 @@ GNU Bison NEWS
 
 ** Bug fixes
 
-*** Portability issues in the test suite.
+*** Errors in caret diagnostics
+
+  On some platforms, some errors could result in endless diagnostics.
 
 *** Fixes of the -Werror option
 
@@ -20,6 +22,10 @@ GNU Bison NEWS
   As demonstrated in the documentation, one can now leave spaces between
   "%?" and its "{".
 
+*** Fixes in the test suite
+
+  Bugs and portability issues.
+
 * Noteworthy changes in release 3.0 (2013-07-25) [stable]
 
 ** WARNING: Future backward-incompatibilities!

THANKS

@@ -66,6 +66,7 @@ Johan van Selst           [email protected]
 Jonathan Fabrizio         [email protected]
 Jonathan Nieder           [email protected]
 Juan Manuel Guerrero      [email protected]
+Ken Moffat                [email protected]
 Kees Zeelenberg           [email protected]
 Keith Browne              [email protected]
 Laurent Mascherpa         [email protected]
@@ -79,6 +80,7 @@ Martin Mokrejs            [email protected]
 Martin Nylin              [email protected]
 Matt Kraai                [email protected]
 Matt Rosing               [email protected]
+Michael Felt              [email protected]
 Michael Hayes             [email protected]
 Michael Raskin            [email protected]
 Michiel De Wilde          [email protected]

tests/c++.at

@@ -818,7 +818,8 @@ yylex (yy::parser::semantic_type *lvalp)
   case 'l':
     throw std::runtime_error ("yylex");
   default:
-    lvalp]AT_VARIANT_IF([->build (res)], [->obj = new Object (res)])[;
+    lvalp->]AT_VARIANT_IF([build (Object (res))],
+                          [obj = new Object (res)])[;
     // Fall through.
   case 0:
     return res;