gcc/testsuite/gfortran.dg/func_assign.f90

   1 ! { dg-do compile }
   2 !
   3 ! PR fortran/31559
   4 ! Do not allow assigning to external functions
   5 !
   6 ! Contributed by Steve Kargl <sgk@troutmask.apl.washington.edu>
   7 !
   8 module mod
   9   implicit none
  10 contains
  11   integer function bar()
  12     bar = 4
  13   end function bar
  14
  15   subroutine a()
  16    implicit none
  17    real :: fun
  18    external fun
  19    interface
  20      function funget(a)
  21        integer :: a
  22      end function
  23      subroutine sub()
  24      end subroutine sub
  25    end interface
  26    sub = 'a'  ! { dg-error "is not a variable" }
  27    fun = 4.4  ! { dg-error "is not a variable" }
  28    funget = 4 ! { dg-error "is not a variable" }
  29    bar = 5    ! { dg-error "is not a variable" }
  30   end subroutine a
  31 end module mod
  32
  33 end