[Bug fortran/41859] ICE on invalid expression involving DT with pointer components in I/O

[burnus at gcc dot gnu dot org]

------- Comment #1 from burnus at gcc dot gnu dot org  2009-10-28 22:32 -------
"If a list item of derived type in an unformatted input/output statement is not
processed by a user-defined derived-type input/output procedure (9.5.3.7), and
if any subobject of that list item would be processed by a user-defined
derived-type input/output procedure, the list item is treated as if all of the
components of the object were specified in the list in component order
(4.5.3.5); those components shall be accessible in the scoping unit containing
the input/output statement and shall not be pointers or allocatable.

If a list item of derived type in a formatted input/output statement is not
processed by a user-defined derived-type input/output procedure, that list item
is treated as if all of the components of the list item were specified in the
list in component order; those components shall be accessible in the scoping
unit containing the input/output statement and shall not be pointers or
allocatable.

If a derived-type list item is not treated as a list of its individual
components, that list itemÂ’s ultimate components shall not have the POINTER or
ALLOCATABLE attribute unless that list item is processed by a user-defined
derived-type input/output procedure." (F2003, 9.5.2).

 * * *

Note: The scope issue is also violated as the following example shows. Other
compilers get this right:

error #7300: This derived-type object in an input-output list cannot have
private components.

Error: Data transfer element at (1) cannot have PRIVATE components

Error: Derived type T in io-list has PRIVATE components


module inputdom
  type t
    PRIVATE ! <<<<<<<<<
    integer :: i
  end type t
end module

module m
  use inputdom
contains
  subroutine getstructinput()
    implicit none
    print *, (foo()) ! <<<<<<<<<<
  end subroutine
  function foo()
    type(t), pointer :: foo
    foo => null()
  end function foo
end module m


-- 

burnus at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |accepts-invalid


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41859