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module gh23879
implicit none
private
public :: foo
contains
subroutine foo(a, b)
integer, intent(in) :: a
integer, intent(out) :: b
b = a
call bar(b)
end subroutine
subroutine bar(x)
integer, intent(inout) :: x
x = 2*x
end subroutine
end module gh23879
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