diff --git a/support/xhpast/parser.y b/support/xhpast/parser.y
--- a/support/xhpast/parser.y
+++ b/support/xhpast/parser.y
@@ -52,18 +52,6 @@
   yyextra->error = error;
 }
 
-/*
-
-TODO: Restore this.
-
-static void replacestr(string &source, const string &find, const string &rep) {
-  size_t j;
-  while ((j = source.find(find)) != std::string::npos) {
-    source.replace(j, find.length(), rep);
-  }
-}
-*/
-
 %}
 
 %expect 5