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From: "tkoenig at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libfortran/105456] New: Child I/O does not propage iostat
Date: Mon, 02 May 2022 16:49:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105456

            Bug ID: 105456
           Summary: Child I/O does not propage iostat
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libfortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tkoenig at gcc dot gnu.org
  Target Milestone: ---

The program

module sk1
  implicit none
  type char
     character :: ch
  end type char
  interface read (formatted)
     module procedure read_formatted
  end interface read (formatted)
contains
  subroutine read_formatted (dtv, unit, iotype, vlist, iostat, iomsg)
    class (char), intent(inout) :: dtv
    integer, intent(in) :: unit
    character (len=3D*), intent(in) :: iotype
    integer, intent(in) :: vlist(:)
    integer, intent(out) :: iostat
    character (len=3D*), intent(inout) :: iomsg
    character :: ch
    read (unit,fmt=3D'(A1)', advance=3D"no", iostat=3Diostat, iomsg=3Diomsg=
) ch
    iostat =3D 42
    dtv%ch =3D ch
  end subroutine read_formatted
end module sk1

program skip1
  use sk1
  implicit none
  type (char) :: x
  open (10,status=3D"scratch")
  write (10,'(A)') '', 'a'
  rewind (10)
  read (10,*) x
  write (*,'(10(A))') "Read: '",x%ch,"'"
end program skip1

runs to completion, but it should propagate the iostat to the
caller and error out on the read.=