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module class_23_m
implicit none
type base
integer :: m = 1
end type
type, extends(base) :: derived
integer :: n = 2
end type
contains
subroutine test(self)
class(base) :: self
select type(self)
type is (derived)
if (self%m /= 10) error stop
if (self%n /= 20) error stop
end select
end subroutine
end module
program class_23
use class_23_m
implicit none
class(base), allocatable :: b
type(derived) :: d
allocate(derived :: b)
d = derived(10, 20)
b = d
call test(b)
end program
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