==17933==
==17933== Invalid read of size 4
==17933==    at 0xFB9B7AE: st_lookup (st.c:250)
==17933==    by 0xFB30FEB: search_method (eval.c:472)
==17933==    by 0xFB3104C: rb_get_method_body (eval.c:493)
==17933==    by 0xFB313A3: rb_method_node (eval.c:549)
==17933==    by 0xFB3924C: rb_obj_respond_to (eval.c:4167)
==17933==    by 0xFB3935B: rb_respond_to (eval.c:4184)
==17933==    by 0xFB66C94: convert_type (object.c:2103)
==17933==    by 0xFB68F8D: rb_check_convert_type (object.c:2146)
==17933==    by 0xFB1EA48: rb_check_array_type (array.c:223)
==17933==    by 0xFB55F34: rb_io_puts (io.c:3982)
==17933==    by 0xFB5602F: rb_f_puts (io.c:4013)
==17933==    by 0xFB30A37: call_cfunc (eval.c:5649)
==17933==  Address 0x0 is not stack'd, malloc'd or (recently) free'd