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module interface_01_mod
implicit none
interface a
module procedure a1
module procedure a2
end interface
contains
subroutine a1(a)
integer, intent(inout) :: a
a = a + 1
end subroutine
subroutine a2(a)
real, intent(in out) :: a
a = a + 1
end subroutine
end module
program interface_01
use interface_01_mod, only: a
implicit none
integer :: i
real :: r
i = 5
call a(i)
if (i /= 6) error stop
r = 6
call a(r)
if (r /= 7) error stop
i = 7
call a(i)
if (i /= 8) error stop
end program
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