reference counting
Program received signal SIGSEGV, Segmentation fault.
0x0000000000400793 in refcount_dec ()
(gdb) bt
0  0x0000000000400793 in refcount_dec ()
1  0x000000000040162e in cons ()
2  0x0000000000403875 in scm_main ()
3  0x00000000004015de in main ()
(gdb) quit
fixed crash in ufo13, t1-7 working
last commit
Merge branch 'master' of https://github.com/orchid-hybrid/spider