module mod
real, allocatable, dimension(:,:) :: b
contains
subroutine foo
integer k
if (allocated(b)) then
print*, "b=["
do k = 1,size(b,1)
print*, b(k,1:size(b,2))
enddo
print*, "]"
else
print*, "b is not allocated"
endif
end subroutine foo
end module mod