diff --git a/collects/typed-racket/optimizer/tool/utilities.rkt b/collects/typed-racket/optimizer/tool/utilities.rkt
deleted file mode 100644
index ac26dcabc6..0000000000
--- a/collects/typed-racket/optimizer/tool/utilities.rkt
+++ /dev/null
@@ -1,9 +0,0 @@
-#lang racket/base
-
-;; TODO all this stuff should make it into unstable/X
-
-(provide (all-defined-out))
-
-(define (regexp-filter r log)
-  (for/list ([l (in-list log)] #:when (regexp-match r l))
-    l))