[Bug c/17023] New: ICE with nested functions in parameter declaration

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

While converting the C front end to use proper structures instead of
trees for declarators, I came up with the following testcase which
ICEs with CVS mainline and most other GCC versions I tried it with.
(With 2.95.3, 2.7.2.3 and EGCS 1.0.3a, instead it gives bogus errors.)
The code is undoubtedly invalid, but no compiler version rejects it
with a meaningful error.  (I might look into this later.)

void
f(a, b)
     int a;
     int b[({ void h() {} 1; })];
{
}

nested-func-mess.c: In function `f':
nested-func-mess.c:4: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

Nested functions clearly should not be allowed outside the body of a
function.

-- 
           Summary: ICE with nested functions in parameter declaration
           Product: gcc
           Version: 3.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned 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=17023