diff --git a/Nasal/io.nas b/Nasal/io.nas
index 1dec0a599..cea2f75f9 100644
--- a/Nasal/io.nas
+++ b/Nasal/io.nas
@@ -9,27 +9,6 @@ var readfile = func(file) {
 }
 
 
-# Generates a stat() test routine that is passed the "mode" field
-# (stat(...)[2]) from a stat() call (index 2), extracts the IFMT
-# subfield and compares it with the given type, assumes S_IFMT ==
-# 0xf000.
-var _gen_ifmt_test = func(fmt, ifmt) {
-    func(stat_mode) {
-        debug.warn("use of deprecated function is" ~ fmt ~ "()");
-        var i = int(stat_mode / 0x1000);
-        return ifmt == i - int(i / 0x10) * 0x10;
-    }
-}
-
-
-# Generate file type test predicates isdir(), isreg(), islnk(), etc.
-# Usage: var s = io.stat(filename); # nil -> doesn't exist, broken link
-#        if (s != nil and io.isdir(s[2])) { ... }
-var ifmts = { dir:4, reg:8, lnk:10, sock:12, fifo:1, blk:6, chr:2 };
-foreach (var fmt; keys(ifmts))
-    caller(0)[0]["is" ~ fmt] = _gen_ifmt_test(fmt, ifmts[fmt]);
-
-
 # Loads Nasal file into namespace and executes it. The namespace
 # (module name) is taken from the optional second argument, or
 # derived from the Nasal file's name.