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module class_25_m
implicit none
type base
integer :: m = 1
end type
type, extends(base) :: derived
integer :: n = 2
end type
end module
program class_25
use class_25_m
implicit none
class(base), allocatable :: b
b = derived(10, 20)
select type(b)
type is (derived)
if (b%m /= 10) error stop
if (b%n /= 20) error stop
class default
error stop
end select
b = base(3)
select type(b)
type is (base)
if (b%m /= 3) error stop
class default
error stop
end select
end program
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