another expr/decl ambiguity test

From-SVN: r21826

gcc/testsuite/g++.old-deja/g++.brendan/parse4.C

+// Build don't link: 
+
+// this is marked as an expected error because it evidences an
+// ambiguity in the grammar between expressions and declarations.
+// when the parser's been cleaned up or rewritten, the error
+// marker can go away, since it'll no longer occur.
+
+class B
+{
+public:
+    B( int t ) {}
+    void f() {}
+};
+
+int g() { return 0; }
+
+main()
+{
+    int try1;
+    B( try1 ).f();   // no syntax error
+    B b( g() );      // no syntax error
+    B( ::g() ).f();  // no syntax error 
+    B( g() ).f();    // syntax error before `.' // ERROR - 
+}