[Bug fortran/93499] New: ICE in gfc_zero_size_array, at fortran/arith.c:1686

[gscfq@t-online.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93499

            Bug ID: 93499
           Summary: ICE in gfc_zero_size_array, at fortran/arith.c:1686
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gscfq@t-online.de
  Target Milestone: ---

Follow-up of pr92961 (ICEs down to at least r5) :


$ cat z1.f90
program p
   integer :: a((0.)/0)
   integer :: b = ubound(a,1)
end


$ cat z2.f90
program p
   type t(n)
      integer, len :: n
   end type
   type(t((0)/0)) :: x
end


$ gfortran-10-20200126 -c z1.f90
f951: internal compiler error: Segmentation fault
0xbac5cf crash_signal
        ../../gcc/toplev.c:328
0x61520b gfc_zero_size_array
        ../../gcc/fortran/arith.c:1686
0x61520b reduce_binary0
        ../../gcc/fortran/arith.c:1700
0x61520b eval_intrinsic_f3
        ../../gcc/fortran/arith.c:1749
0x64f9ca simplify_intrinsic_op
        ../../gcc/fortran/expr.c:1196
0x64f9ca gfc_simplify_expr(gfc_expr*, int)
        ../../gcc/fortran/expr.c:2215
0x63cd19 variable_decl
        ../../gcc/fortran/decl.c:2576
0x63cd19 gfc_match_data_decl()
        ../../gcc/fortran/decl.c:6120
0x6a0443 match_word
        ../../gcc/fortran/parse.c:65
0x6a0443 decode_statement
        ../../gcc/fortran/parse.c:376
0x6a1e8a next_free
        ../../gcc/fortran/parse.c:1279
0x6a1e8a next_statement
        ../../gcc/fortran/parse.c:1511
0x6a4234 parse_spec
        ../../gcc/fortran/parse.c:3738
0x6a62ac parse_progunit
        ../../gcc/fortran/parse.c:5851
0x6a7989 gfc_parse_file()
        ../../gcc/fortran/parse.c:6391
0x6f265f gfc_be_parse_file
        ../../gcc/fortran/f95-lang.c:210