this test case (with an invalid collapse):

  SUBROUTINE init_input_type()
  INTEGER :: k,l(3),u(3)
!$omp parallel do shared(l,u) collapse(3)
    DO k = l(3),u(3)

leads to an ice with current trunk as:

#0  gfc_resolve_omp_directive (code=0x1437880, ns=<value optimized out>) at
#1  0x000000000051f74c in resolve_code (code=0x1437880, ns=0x1435f00) at
#2  0x000000000052063a in resolve_codes (ns=0x1435f00) at
#3  0x000000000052074c in gfc_resolve (ns=0x1435f00) at
#4  0x0000000000513cd7 in gfc_parse_file () at
#5  0x000000000054ce7d in gfc_be_parse_file (set_yydebug=<value optimized out>)
at /data03/vondele/gcc_trunk/gcc/gcc/fortran/f95-lang.c:242
#6  0x000000000085fa4d in toplev_main (argc=20, argv=0x7fff13674938) at
#7  0x00007ffdb4e7d436 in __libc_start_main () from /lib64/
#8  0x00000000004aa599 in _start ()

           Summary: segfault on omp collapse
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jv244 at cam dot ac dot uk

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