[Bug fortran/54949] New: [F03] abstract procedure pointers not rejected

["janus at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54949

             Bug #: 54949
           Summary: [F03] abstract procedure pointers not rejected
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: janus@gcc.gnu.org


Test case (inspired by
https://groups.google.com/forum/?fromgroups=#!topic/comp.lang.fortran/F_ROPgBJGpY):

program test
  implicit none
  abstract interface
    subroutine abssub
    end subroutine
  end interface
  pointer :: abssub

  abssub => sub

contains

  subroutine sub
  end subroutine

end



This currently gives an

internal compiler error: in fold_convert_loc, at fold-const.c:1979

but should be rejected, since a procedure pointer can not be ABSTRACT.