From 9ee0665fad211bc2c07afdbeb15cb3121adc3801 Mon Sep 17 00:00:00 2001
From: Max Brunsfeld <maxbrunsfeld@gmail.com>
Date: Tue, 9 Sep 2014 12:34:15 -0700
Subject: [PATCH] Remove unused code in extract_tokens.cc

---
 .../prepare_grammar/extract_tokens.cc         | 25 ++++++-------------
 1 file changed, 7 insertions(+), 18 deletions(-)

diff --git a/src/compiler/prepare_grammar/extract_tokens.cc b/src/compiler/prepare_grammar/extract_tokens.cc
index 2f65f290..9d397fa2 100644
--- a/src/compiler/prepare_grammar/extract_tokens.cc
+++ b/src/compiler/prepare_grammar/extract_tokens.cc
@@ -16,30 +16,20 @@
 namespace tree_sitter {
 namespace prepare_grammar {
 
-using std::pair;
-using std::tuple;
-using std::string;
-using std::map;
-using std::to_string;
-using std::vector;
-using std::set;
+using std::dynamic_pointer_cast;
 using std::make_shared;
 using std::make_tuple;
-using std::dynamic_pointer_cast;
+using std::map;
+using std::pair;
+using std::set;
+using std::string;
+using std::tuple;
+using std::vector;
 using rules::rule_ptr;
 using rules::Symbol;
 using rules::SymbolOptionToken;
 using rules::SymbolOptionAuxToken;
 
-class UsedSymbols : public rules::IdentityRuleFn {
-  set<Symbol> used_symbols_;
-
-  rules::rule_ptr apply(rules::Symbol *sym) {
-    used_symbols_.insert(*sym);
-    return sym->copy();
-  }
-};
-
 class SymbolInliner : public rules::IdentityRuleFn {
   map<Symbol, Symbol> replacements;
   using rules::IdentityRuleFn::apply_to;
@@ -71,7 +61,6 @@ class SymbolInliner : public rules::IdentityRuleFn {
 };
 
 class TokenExtractor : public rules::IdentityRuleFn {
-
   rule_ptr apply_to_token(const rules::Rule *input) {
     auto rule = input->copy();
     for (size_t i = 0; i < tokens.size(); i++)