Fix minor leak: class-caches were not reset if a class was forgotten

core/classes/classes-tests.factor

@@ -3,7 +3,8 @@ kernel math namespaces parser prettyprint sequences strings
 tools.test vectors words quotations classes
 classes.private classes.union classes.mixin classes.predicate
 classes.algebra vectors definitions source-files
-compiler.units kernel.private sorting vocabs ;
+compiler.units kernel.private sorting vocabs memory eval
+accessors ;
 IN: classes.tests
 
 [ t ] [ 3 object instance? ] unit-test
@@ -27,3 +28,13 @@ M: method-forget-class method-forget-test ;
     implementors-map get keys
     [ natural-sort ] bi@ =
 ] unit-test
+
+! Minor leak
+[ ] [ "IN: classes.tests TUPLE: forget-me ;" eval ] unit-test
+[ ] [ f \ word set-global ] unit-test
+[ ] [ "IN: classes.tests USE: kernel USE: classes.algebra forget-me tuple class<= drop" eval ] unit-test
+[ ] [ "IN: classes.tests FORGET: forget-me" eval ] unit-test
+[ 0 ] [
+    [ word? ] instances
+    [ [ name>> "forget-me" = ] [ vocabulary>> "classes.tests" = ] bi and ] count
+] unit-test

core/classes/classes.factor

@@ -176,7 +176,8 @@ GENERIC: class-forgotten ( use class -- )
         [ implementors-map- ]
         [ update-map- ]
         [ reset-class ]
-    } cleave ;
+    } cleave
+    reset-caches ;
 
 M: class class-forgotten
     nip forget-class ;