From daa87fce6636cde7cd83a90417e7009ee1c4135b Mon Sep 17 00:00:00 2001
From: Slava Pestov <slava@factorcode.org>
Date: Thu, 24 Jun 2010 04:28:34 -0400
Subject: [PATCH] stack-checker.dependencies: fix error thrown if
 depends-on-single-method parameters are no longer valid

---
 basis/stack-checker/dependencies/dependencies.factor | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/basis/stack-checker/dependencies/dependencies.factor b/basis/stack-checker/dependencies/dependencies.factor
index f35fb4afd7..bb1cf080de 100644
--- a/basis/stack-checker/dependencies/dependencies.factor
+++ b/basis/stack-checker/dependencies/dependencies.factor
@@ -165,7 +165,10 @@ SYMBOL: +no-method+
 
 M: depends-on-single-method satisfied?
     [ method-class>> ] [ object-class>> ] [ generic>> ] tri
-    subclass-with-only-method = ;
+    {
+        [ [ class? ] [ class? ] [ generic? ] tri* and and ]
+        [ subclass-with-only-method = ]
+    } 3&& ;
 
 TUPLE: depends-on-method-identity class generic method ;