Remove the |startRule| property from the AST

It's redundant.

lib/compiler/passes/generate-javascript.js

@@ -6,7 +6,7 @@ module.exports = function(ast, options) {
   options = utils.clone(options);
   utils.defaults(options, {
     cache:              false,
-    allowedStartRules:  [ast.startRule],
+    allowedStartRules:  [ast.rules[0].name],
     optimize:           "speed"
   });
 

lib/compiler/passes/remove-proxy-rules.js

@@ -58,7 +58,7 @@ module.exports = function(ast, options) {
   var indices = [],
       allowedStartRules = options.allowedStartRules !== undefined
         ? options.allowedStartRules
-        : [ast.startRule];
+        : [ast.rules[0].name];
 
   utils.each(ast.rules, function(rule, i) {
     if (isProxyRule(rule)) {

lib/parser.js

@@ -77,8 +77,7 @@ module.exports = (function() {
               return {
                 type:        "grammar",
                 initializer: initializer !== "" ? initializer : null,
-                rules:       rules,
-                startRule:   rules[0].name
+                rules:       rules
               };
             },
         peg$c4 = function(code) {

spec/parser.spec.js

@@ -34,8 +34,7 @@ describe("PEG.js grammar parser", function() {
           name:       "start",
           expression: expression
         }
-      ],
-      startRule:   "start"
+      ]
     };
   }
 
@@ -170,20 +169,17 @@ describe("PEG.js grammar parser", function() {
     expect('a = "abcd"').toParseAs({
       type:        "grammar",
       initializer: null,
-      rules:       [ruleA],
-      startRule:   "a"
+      rules:       [ruleA]
     });
     expect('{ code } a = "abcd"').toParseAs({
       type:        "grammar",
       initializer: { type: "initializer", code: " code " },
-      rules:       [ruleA],
-      startRule:   "a"
+      rules:       [ruleA]
     });
     expect('a = "abcd"; b = "efgh"; c = "ijkl"').toParseAs({
       type:        "grammar",
       initializer: null,
-      rules:       [ruleA, ruleB, ruleC],
-      startRule:   "a"
+      rules:       [ruleA, ruleB, ruleC]
     });
   });
 

src/parser.pegjs

@@ -7,8 +7,7 @@ grammar
       return {
         type:        "grammar",
         initializer: initializer !== "" ? initializer : null,
-        rules:       rules,
-        startRule:   rules[0].name
+        rules:       rules
       };
     }