diff --git a/vm.cpp b/vm.cpp
index 2a12f40b8..58e12189a 100644
--- a/vm.cpp
+++ b/vm.cpp
@@ -532,32 +532,6 @@ RoxorCore::debug_outers(Class k)
     printf("\n");
 }
 
-void
-rb_vm_print_backtrace()
-{
-    void *callstack[128];
-    int callstack_n = backtrace(callstack, 128);
-
-    for (int i = 0; i < callstack_n; i++) {
-	char path[PATH_MAX];
-	char name[100];
-	unsigned long ln = 0;
-
-	path[0] = name[0] = '\0';
-
-	if (GET_CORE()->symbolize_call_address(callstack[i], path, sizeof path,
-					       &ln, name, sizeof name, NULL)
-		&& name[0] != '\0' && path[0] != '\0') {
-	    if (ln == 0) {
-		printf("%s:in `%s'\n", path, name);
-	    }
-	    else {
-		printf("%s:%ld:in `%s'\n", path, ln, name);
-	    }
-	}
-    }
-}
-
 #if !defined(MACRUBY_STATIC)
 void
 RoxorCore::optimize(Function *func)
@@ -3463,14 +3437,6 @@ RoxorVM::pop_current_exception(int pos)
 	return;
     }
 
-    if ((size_t)pos >= current_exceptions.size()) {
-	printf("pos: %d, current_exceptions.size(): %d\n",
-	       pos, (int)current_exceptions.size());
-	rb_vm_print_backtrace();
-	debug_exceptions();
-	return;
-    }
-
     assert((size_t)pos < current_exceptions.size());
 
     std::vector<VALUE>::iterator iter = current_exceptions.end() - (pos + 1);