(j3.2006) Chaining type-bound procedure references

[Van Snyder]

On Fri, 2014-05-02 at 01:00 -0400, Rafik Zurob wrote:
> val = x%foo()%bar()
> 
> would require a temp pointer
> 
> temp_ptr_dscr => x%foo()
> val = temp_ptr_dscr%bar()

I don't understand how that is inferior to a user-declared temp pointer.