With yarv built from svn head (r522), I get:

hiro:~/Code/Lang/Ruby/yarv dudley$ ./ruby-yarv -e "1"
-- stack frame ------------
-- control frame ----------
c:0001 p:---- s:0000 b:-001 l:000000 d:000000 ------
---------------------------
[BUG] Segmentation fault
ruby 2.0.0 (2006-04-08) [i686-darwin8.7.1]


running under gdb shows:

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x0068500c
frame_func_id (cfp=0x685000) at eval.c:1824
1824        yarv_iseq_t *iseq = cfp->iseq;

with this backtrace:

#0  frame_func_id (cfp=0x685000) at eval.c:1824
#1  0x00002da9 in error_pos () at eval_error.h:39
#2  0x000066b6 in error_print () at eval_error.h:100
#3  0x00006a7f in error_handle (ex=884616) at eval_error.h:243
#4  0x00006b13 in ruby_options (argc=3, argv=0xbffff534) at eval.c:149
#5  0x00001a2a in main (argc=3, argv=0xbffff534, envp=0xbffff544) at  
main.c:45



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