[Bug fortran/92872] New: [10 Regression] ICE in build_fold_indirect_ref_loc, at fold-const.c:14842

[gscfq@t-online.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92872

            Bug ID: 92872
           Summary: [10 Regression] ICE in build_fold_indirect_ref_loc, at
                    fold-const.c:14842
           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: ---

Changed between 20190929 and 20191006 :
(with a legal z0 for reference)


$ cat z0.f90
subroutine s(x)
   integer, allocatable, optional :: x(:)
   x = [1, 2, 3]
end

$ gfortran-10-20191208 -c z0.f90



$ cat z1.f90
subroutine s(x) bind(c)
   integer, allocatable, optional :: x(:)
   x = [1, 2, 3]
end


$ gfortran-10-20190929 -c z1.f90
$
$ gfortran-10-20191208 -c z1.f90
z1.f90:3:0:

    3 |    x = [1, 2, 3]
      |
internal compiler error: Segmentation fault
0xd05dff crash_signal
        ../../gcc/toplev.c:328
0x9821e4 contains_struct_check(tree_node*, tree_node_structure_enum, char
const*, int, char const*)
        ../../gcc/tree.h:3386
0x9821e4 build_fold_indirect_ref_loc(unsigned int, tree_node*)
        ../../gcc/fold-const.c:14842
0x715eef gfc_conv_scalarized_array_ref
        ../../gcc/fortran/trans-array.c:3511
0x716c54 gfc_conv_array_ref(gfc_se*, gfc_array_ref*, gfc_expr*, locus*)
        ../../gcc/fortran/trans-array.c:3641
0x75679e gfc_conv_variable
        ../../gcc/fortran/trans-expr.c:2808
0x7514ba gfc_conv_expr(gfc_se*, gfc_expr*)
        ../../gcc/fortran/trans-expr.c:8665
0x75d677 gfc_trans_assignment_1
        ../../gcc/fortran/trans-expr.c:10884
0x709ee7 trans_code
        ../../gcc/fortran/trans.c:1864
0x74107d gfc_generate_function_code(gfc_namespace*)
        ../../gcc/fortran/trans-decl.c:6801
0x6bafe6 translate_all_program_units
        ../../gcc/fortran/parse.c:6302
0x6bafe6 gfc_parse_file()
        ../../gcc/fortran/parse.c:6541
0x705fcf gfc_be_parse_file
        ../../gcc/fortran/f95-lang.c:210