>>609 (インデント用)

module mod
contains
real function call_func(func, arg)
interface
real function func(arg)
real, intent(in) :: arg(2)
end function func
end interface
real, intent(in) :: arg(2)
call_func = func(arg)
return
end function call_func
end module mod

real function func(arg)
real, intent(in) :: arg(2)
func = arg(1) * arg(2)
return
end function func

program main
use mod
external func
real :: arg(2) = (/ 2.0, 3.0 /)
! dummy = func(arg)
print *, call_func(func, arg)
stop
end program main