[Bug fortran/96024] New: [9/10/11 Regression] ICE in mio_name_expr_t, at fortran/module.c:2159

["gscfq@t-online.de" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96024

            Bug ID: 96024
           Summary: [9/10/11 Regression] ICE in mio_name_expr_t, at
                    fortran/module.c:2159
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gscfq@t-online.de
  Target Milestone: ---

This invalid code (character char(n) is not a legal len value)
gives an ICE down to r6, seems to be accepted by r5 :


$ cat z1.f90
module m
   type t
      character(char(1)) :: a
   end type
   type(t) :: z = t('a')
end


$ gfortran-5 -c z1.f90
$
$ gfortran-11-20200628 -c z1.f90
f951: internal compiler error: Segmentation fault
0xbd215f crash_signal
        ../../gcc/toplev.c:328
0x696d8c mio_name_expr_t
        ../../gcc/fortran/module.c:2159
0x696d8c mio_expr
        ../../gcc/fortran/module.c:3567
0x697543 mio_charlen
        ../../gcc/fortran/module.c:2629
0x69763c mio_typespec
        ../../gcc/fortran/module.c:2687
0x696da0 mio_expr
        ../../gcc/fortran/module.c:3586
0x697543 mio_charlen
        ../../gcc/fortran/module.c:2629
0x69763c mio_typespec
        ../../gcc/fortran/module.c:2687
0x6979c5 mio_component
        ../../gcc/fortran/module.c:2920
0x6989da mio_component_list
        ../../gcc/fortran/module.c:2957
0x6989da mio_symbol
        ../../gcc/fortran/module.c:4416
0x698e3d write_symbol
        ../../gcc/fortran/module.c:5771
0x698fa2 write_symbol0
        ../../gcc/fortran/module.c:5811
0x698f18 write_symbol0
        ../../gcc/fortran/module.c:5790
0x698f18 write_symbol0
        ../../gcc/fortran/module.c:5790
0x69bb04 write_module
        ../../gcc/fortran/module.c:6153
0x69bb04 dump_module
        ../../gcc/fortran/module.c:6283
0x69becd gfc_dump_module(char const*, int)
        ../../gcc/fortran/module.c:6340
0x6b5d26 gfc_parse_file()
        ../../gcc/fortran/parse.c:6457
0x7016ff gfc_be_parse_file
        ../../gcc/fortran/f95-lang.c:212