https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83866

            Bug ID: 83866
           Summary: [8 Regression] ICE in gfc_release_symbol, at
                    fortran/symbol.c:3087
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gs...@t-online.de
  Target Milestone: ---

With a missing comma :

$ cat z1.f90
program p
   type t
      class(t), pointer :: a
   end type
   type extends(t) :: t2
   end type
end


$ gfortran-8-20180114 -c z1.f90
f951: internal compiler error: in gfc_release_symbol, at fortran/symbol.c:3087
0x736ceb gfc_release_symbol(gfc_symbol*)
        ../../gcc/fortran/symbol.c:3087
0x736e6e gfc_restore_last_undo_checkpoint()
        ../../gcc/fortran/symbol.c:3696
0x6f3db7 reject_statement
        ../../gcc/fortran/parse.c:2547
0x6f3ecc match_word_omp_simd
        ../../gcc/fortran/parse.c:98
0x6f7efb match_word
        ../../gcc/fortran/parse.c:565
0x6f7efb decode_statement
        ../../gcc/fortran/parse.c:565
0x6f93d4 next_free
        ../../gcc/fortran/parse.c:1226
0x6f93d4 next_statement
        ../../gcc/fortran/parse.c:1458
0x6facbc parse_spec
        ../../gcc/fortran/parse.c:3836
0x6fd173 parse_progunit
        ../../gcc/fortran/parse.c:5649
0x6fe754 gfc_parse_file()
        ../../gcc/fortran/parse.c:6189
0x744e5f gfc_be_parse_file
        ../../gcc/fortran/f95-lang.c:204



Using version 7 or older :

$ gfortran-7 -c z1.f90
z1.f90:5:3:

    type extends(t) :: t2
   1
Error: Unclassifiable statement at (1)
z1.f90:6:6:

    end type
      1
Error: Expecting END PROGRAM statement at (1)

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