diff --git a/extra/combinators/lib/lib-tests.factor b/extra/combinators/lib/lib-tests.factor
index 0a08948346..ed481f72e6 100755
--- a/extra/combinators/lib/lib-tests.factor
+++ b/extra/combinators/lib/lib-tests.factor
@@ -46,3 +46,8 @@ IN: combinators.lib.tests
         [ dup array? ] [ dup vector? ] [ dup float? ]
     } || nip
 ] unit-test
+
+
+{ 1 1 } [
+    [ even? ] [ drop 1 ] [ drop 2 ] ifte
+] must-infer-as