Daniel, I have applied your patch on i686-apple-darwin9 and your test case gfortran.dg/typebound_call_1.f03 hangs: [ibook-dhum] f90/bug% time a.out Hi from adder! ^C0.000u 0.002s 1:32.95 0.0% 0+0k 0+0io 0pf+0w Dominique