1 files changed, 3 insertions, 0 deletions
diff --git a/marshal.c b/marshal.c
index a7b2efebc6..318292b125 100644
--- a/marshal.c
+++ b/marshal.c
@@ -213,6 +213,9 @@ w_unique(s, arg)
     char *s;
     struct dump_arg *arg;
 {
+    if (s[0] == '#') {
+	rb_raise(rb_eArgError, "can't dump anonymous class %s", s);
+    }
     w_symbol(rb_intern(s), arg);
 }