[Bug fortran/83874] New: [6/7/8 Regression] ICE initializing character array from derived type

["anlauf at gmx dot de" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83874

            Bug ID: 83874
           Summary: [6/7/8 Regression] ICE initializing character array
                    from derived type
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: anlauf at gmx dot de
  Target Milestone: ---

The following works up to 5.0.0, but crashes with 6.0.0 through 8.0-trunk:

program gfcbug146
  implicit none
  type t
     character(len=1) :: name
  end type t
  type(t), parameter :: z(2)= [ t ('a'), t ('b') ]
! character(len=1), parameter :: names(*) = z% name   ! works
  character(len=*), parameter :: names(2) = z% name   ! ICE
! character(len=*), parameter :: names(*) = z% name   ! ICE
end program gfcbug146

% gfc-8 gfcbug146.f90
f951: internal compiler error: Segmentation fault
0x89a4680 crash_signal
        ../../trunk/gcc/toplev.c:325
0x82ce89a add_init_expr_to_sym
        ../../trunk/gcc/fortran/decl.c:1724
0x82d996c variable_decl
        ../../trunk/gcc/fortran/decl.c:2589
0x82d996c gfc_match_data_decl()
        ../../trunk/gcc/fortran/decl.c:5698
0x833a021 match_word
        ../../trunk/gcc/fortran/parse.c:65
0x833a021 match_word
        ../../trunk/gcc/fortran/parse.c:54
0x833cb81 decode_statement
        ../../trunk/gcc/fortran/parse.c:376
0x833cb81 decode_statement
        ../../trunk/gcc/fortran/parse.c:295
0x833e34c next_free
        ../../trunk/gcc/fortran/parse.c:1226
0x833e34c next_statement
        ../../trunk/gcc/fortran/parse.c:1458
0x833fb9f parse_spec
        ../../trunk/gcc/fortran/parse.c:3836
0x8341bc3 parse_progunit
        ../../trunk/gcc/fortran/parse.c:5649
0x8342ecb gfc_parse_file()
        ../../trunk/gcc/fortran/parse.c:6189
0x838b8ae gfc_be_parse_file
        ../../trunk/gcc/fortran/f95-lang.c:204
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