diff --git a/fn.rs b/fn.rs
deleted file mode 100644
index 186eda95fecbd..0000000000000
--- a/fn.rs
+++ /dev/null
@@ -1,8 +0,0 @@
-
-fn foo(x:  fn(&u8, &u8), y: Vec<&u8>, z: &u8) {
-// Debruijn   1    1            1        1
-// Anon-Index 0    1            0        1
-//            ------
-//            debruijn indices are shifted by 1 in here
-  y.push(z); // index will be zero or one
-}