ruby_vm_sysstack_error_copy  504 eval.c         		    mesg = ruby_vm_sysstack_error_copy();
ruby_vm_sysstack_error_copy 1473 internal.h     VALUE ruby_vm_sysstack_error_copy(void);
ruby_vm_sysstack_error_copy   41 vm_insnhelper.c     rb_exc_raise(ruby_vm_sysstack_error_copy());