RUBY_EVENT_B_RETURN  587 compile.c      		ADD_TRACE(ret, nd_line(node), RUBY_EVENT_B_RETURN);
RUBY_EVENT_B_RETURN 1524 vm.c           	    EXEC_EVENT_HOOK(th, RUBY_EVENT_B_RETURN, th->cfp->self, 0, 0, Qnil);
RUBY_EVENT_B_RETURN 1534 vm.c           	    EXEC_EVENT_HOOK_AND_POP_FRAME(th, RUBY_EVENT_B_RETURN, th->cfp->self, 0, 0, Qnil);
RUBY_EVENT_B_RETURN  690 vm_trace.c     	RUBY_EVENT_RETURN | RUBY_EVENT_B_RETURN | RUBY_EVENT_C_RETURN;
RUBY_EVENT_B_RETURN  837 vm_trace.c         if (trace_arg->event & (RUBY_EVENT_RETURN | RUBY_EVENT_C_RETURN | RUBY_EVENT_B_RETURN)) {