Renamed an iterator variable: "key" -> "rule".

lib/compiler.js

@@ -25,14 +25,14 @@ PEG.buildParser = function(grammar, startRule) {
 
   var ast = PEG.grammarParser.parse(grammar);
 
-  for (var key in ast) {
-    ast[key].checkReferencedRulesExist(ast);
+  for (var rule in ast) {
+    ast[rule].checkReferencedRulesExist(ast);
   }
   if (ast[startRule] === undefined) {
     throw new PEG.Grammar.GrammarError("Missing \"" + startRule + "\" rule.");
   }
-  for (var key in ast) {
-    ast[key].checkNoLeftRecursion(ast, []);
+  for (var rule in ast) {
+    ast[rule].checkNoLeftRecursion(ast, []);
   }
 
   return PEG.Compiler.compileParser(ast, startRule);
@@ -422,8 +422,8 @@ PEG.Compiler = {
     this._resetUniqueIdentifierCounters();
 
     var parseFunctionDefinitions = [];
-    for (var key in grammar) {
-      parseFunctionDefinitions.push(grammar[key].compile());
+    for (var rule in grammar) {
+      parseFunctionDefinitions.push(grammar[rule].compile());
     }
 
     var source = this.formatCode(