[Bug fortran/95342] New: [9/10/11 Regression] ICE in gfc_match_subroutine, at fortran/decl.c:7913

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95342

            Bug ID: 95342
           Summary: [9/10/11 Regression] ICE in gfc_match_subroutine, at
                    fortran/decl.c:7913
           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: ---

Changed between 20191013 and 20191020, with a name conflict :


$ cat z1.f90
module m
   interface
      module subroutine s()
      end
      subroutine s() bind(c)
      end
   end interface
end


$ gfortran-11-20200524 -c z1.f90
f951: internal compiler error: Segmentation fault
0xbc0f6f crash_signal
        ../../gcc/toplev.c:328
0x644307 gfc_match_subroutine()
        ../../gcc/fortran/decl.c:7913
0x6a8427 decode_statement
        ../../gcc/fortran/parse.c:382
0x6a9e1a next_free
        ../../gcc/fortran/parse.c:1279
0x6a9e1a next_statement
        ../../gcc/fortran/parse.c:1511
0x6aba5c parse_interface
        ../../gcc/fortran/parse.c:3519
0x6aba5c parse_spec
        ../../gcc/fortran/parse.c:3875
0x6af43e parse_module
        ../../gcc/fortran/parse.c:6115
0x6af787 gfc_parse_file()
        ../../gcc/fortran/parse.c:6428
0x6fb9af gfc_be_parse_file
        ../../gcc/fortran/f95-lang.c:210