[Bug fortran/18525] New: [gfortran] ICE on invalid(?) code in gfc_get_symbol_decl()

[martin at mpa-garching dot mpg dot de]

The following testcase causes an ICE in the current gfortran. 
The code seems ill-formed to me, because the name "n" 
was already defined as a constant in the module scope, 
but I'm not sure. 
 
This was originally reported by Vivek Rao (vivekrao4@yahoo.com). 
 
module zz 
integer, parameter :: n=2 ! causes ICE 
contains 
subroutine xx(n) 
call yy(n) 
end subroutine xx 
end module zz 
 
~/tmp>gfortran -v -c bug.f90 
Reading specs 
from /afs/mpa/data/martin/ugcc/lib/gcc/i686-pc-linux-gnu/4.0.0/specs 
Configured with: /scratch/gcc/configure --quiet 
--prefix=/afs/mpa/data/martin/ugcc --enable-languages=c++,f95 
--with-gmp=/afs/mpa/data/martin/mygmp 
Thread model: posix 
gcc version 4.0.0 20041117 (experimental) 
 /afs/mpa/data/martin/ugcc/libexec/gcc/i686-pc-linux-gnu/4.0.0/f951 bug.f90 
-quiet -dumpbase bug.f90 -mtune=pentiumpro -auxbase bug -version 
-o /tmp/ccVLWgWD.s 
GNU F95 version 4.0.0 20041117 (experimental) (i686-pc-linux-gnu) 
        compiled by GNU C version 4.0.0 20041117 (experimental). 
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096 
bug.f90: In function 'xx': 
bug.f90:4: internal compiler error: in gfc_get_symbol_decl, at 
fortran/trans-decl.c:704 
Please submit a full bug report, 
with preprocessed source if appropriate. 
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

-- 
           Summary: [gfortran] ICE on invalid(?) code in
                    gfc_get_symbol_decl()
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: martin at mpa-garching dot mpg dot de
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18525