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From: "tkoenig at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libfortran/105361] New: Incorrect end-of-file condition for
 derived-type I/O
Date: Sat, 23 Apr 2022 16:29:13 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105361

            Bug ID: 105361
           Summary: Incorrect end-of-file condition for derived-type I/O
           Product: gcc
           Version: 12.0
            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 following test case

module x
  implicit none
  type foo
     real :: r
  end type foo
  interface read(formatted)
     module procedure read_formatted
  end interface read(formatted)
contains
  subroutine read_formatted (dtv, unit, iotype, vlist, iostat, iomsg)
    class (foo), 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
    read (unit,*,iostat=3Diostat,iomsg=3Diomsg) dtv%r
    print *,dtv%r
  end subroutine read_formatted
end module x

program main
  use x
  implicit none
  type(foo) :: a, b
  read (*,*) a, b
  print *,a,b
end program main

yields, when invoked with

$ echo "1 2" | ./a.out
   1.00000000=20=20=20=20
   2.00000000=20=20=20=20
At line 25 of file test.f90 (unit =3D 5, file =3D 'stdin')
Fortran runtime error: End of file

[...]

The end-of-file condition is incorrect.  The print statement
in read_formatted is there just to show the input is read correctly.=