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module parent
real, parameter :: pi = 4.*atan(1.)
real :: tau
interface
module elemental real function pi2tau(pi)
real, intent(in) :: pi
end function pi2tau
module subroutine good()
end subroutine good
end interface
end module parent
use parent
tau = pi2tau(pi)
print *,'pi=',pi, 'tau=', tau
call good()
end program