[Bug fortran/64244] New: internal compiler error at class.c:236 when using non_overridable

["ondrej.certik at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64244

            Bug ID: 64244
           Summary: internal compiler error at class.c:236 when using
                    non_overridable
           Product: gcc
           Version: 4.9.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ondrej.certik at gmail dot com

Created attachment 34235
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34235&action=edit
Test program to trigger ICE

This test file (also attached) produces ICE:

$ cat test_non_overridable.f90 
module m
implicit none

type :: A
contains
    generic :: f => g
    procedure, non_overridable :: g
end type

contains

subroutine g(this)
class(A), intent(in) :: this
end subroutine

end module


program test_non_overridable
use m, only: A
implicit none
class(A), allocatable :: h
call h%f()
end program


$ gfortran test_non_overridable.f90 
f951: internal compiler error: in gfc_add_component_ref, at fortran/class.c:236
0x543cf7 gfc_add_component_ref(gfc_expr*, char const*)
    ../.././gcc/fortran/class.c:236
0x5b4c07 resolve_typebound_subroutine
    ../.././gcc/fortran/resolve.c:5942
0x5b4c07 gfc_resolve_code(gfc_code*, gfc_namespace*)
    ../.././gcc/fortran/resolve.c:9966
0x5b72aa resolve_codes
    ../.././gcc/fortran/resolve.c:14719
0x5b7392 gfc_resolve
    ../.././gcc/fortran/resolve.c:14747
0x5a2e5a resolve_all_program_units
    ../.././gcc/fortran/parse.c:4886
0x5a2e5a gfc_parse_file()
    ../.././gcc/fortran/parse.c:5135
0x5e00f5 gfc_be_parse_file
    ../.././gcc/fortran/f95-lang.c:212
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.

This affects gfortran 4.9.2, I also tried gfortran 4.7.2 which gives:

$ gfortran test_non_overridable.f90 
f951: internal compiler error: in gfc_add_component_ref, at fortran/class.c:209
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.


When you remove the "non_overridable" keyword, it compiles. I wasn't able to
simplify the test case further.