[Bug c/13728] New: Duplicate parameter names not detected

["jsm28 at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

void f (int fred, int fred);
void f2 (int fred, int fred) {}

does not get any diagnostics with current 3.4 or 3.5 CVS.  3.3.2 gives
proper errors (albeit with some duplication):

t.c:1: error: redefinition of `fred'
t.c:1: error: `fred' previously declared here
t.c:2: error: redefinition of `fred'
t.c:2: error: `fred' previously declared here
t.c: In function `f2':
t.c:2: error: redeclaration of `fred'
t.c:2: error: `fred' previously declared here

-- 
           Summary: Duplicate parameter names not detected
           Product: gcc
           Version: 3.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: zack at gcc dot gnu dot org
        ReportedBy: jsm28 at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13728