[Bug fortran/47136] [OOP] possible name resolution problems between MODULE and INTERFACE?

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47136

--- Comment #3 from janus at gcc dot gnu.org 2011-01-02 13:33:50 UTC ---
Some related non-OOP examples:


module a
contains
  subroutine s()
  end subroutine
end module

module s
  use a
contains
  subroutine sub()
    call s
  end subroutine
end 


gives:

    call s
          1
Error: Name 's' at (1) is an ambiguous reference to 's' from current program
unit


Example #2:


module a
contains
  subroutine s()
  end subroutine
end module

module m
  use a
contains
  subroutine s()
  end subroutine
end 


gives:

  subroutine s()
              1
test.f90:8.7:

  use a
       2
Error: Procedure 's' at (1) is already defined at (2)


Are these examples actually valid or invalid? Can someone give the relevant
quotes from the standard?