! { dg-do run }
! { dg-options "-fcheck=do" }
! { dg-shouldfail "DO check" }
!
! PR fortran/34656
! Run-time check for modifing loop variables
!

module x
  integer :: i
contains
  SUBROUTINE do_something()
    IMPLICIT NONE
    DO i=1,10
    ENDDO
  END SUBROUTINE do_something
end module x

PROGRAM test
  use x
  IMPLICIT NONE
  DO i=1,100
     CALL do_something()
  ENDDO
end PROGRAM test

! { dg-output "Fortran runtime error: Loop variable has been modified" }