diff --git a/extra/tools/test/inference/authors.txt b/extra/tools/test/inference/authors.txt
deleted file mode 100755
index 1901f27a24..0000000000
--- a/extra/tools/test/inference/authors.txt
+++ /dev/null
@@ -1 +0,0 @@
-Slava Pestov
diff --git a/extra/tools/test/inference/inference.factor b/extra/tools/test/inference/inference.factor
deleted file mode 100755
index cc77f4910d..0000000000
--- a/extra/tools/test/inference/inference.factor
+++ /dev/null
@@ -1,15 +0,0 @@
-! Copyright (C) 2007 Slava Pestov.
-! See http://factorcode.org/license.txt for BSD license.
-USING: effects sequences kernel arrays quotations inference
-tools.test words ;
-IN: tools.test.inference
-
-: short-effect
-    dup effect-in length swap effect-out length 2array ;
-
-: unit-test-effect ( effect quot -- )
-    >r 1quotation r> [ infer short-effect ] curry unit-test ;
-
-: must-infer ( word/quot -- )
-    dup word? [ 1quotation ] when
-    [ infer drop ] curry [ ] swap unit-test ;