1 files changed, 3 insertions, 0 deletions
diff --git a/gc.c b/gc.c
index 996713ef19..00d55666a3 100644
--- a/gc.c
+++ b/gc.c
@@ -392,6 +392,9 @@ rb_newobj()
 {
     VALUE obj;
 
+    if (during_gc)
+	rb_bug("object allocation during garbage collection phase");
+
     if (!freelist) garbage_collect();
 
     obj = (VALUE)freelist;