Action AST node no longer accepts functions as actions (only strings).

lib/compiler.js

@@ -993,9 +993,6 @@ PEG.Grammar.RuleRef.prototype.compile = function(resultVar) {
 PEG.Grammar.Action.prototype.compile = function(resultVar) {
   var expressionResultVar = PEG.Compiler.generateUniqueIdentifier("result");
 
-  if (typeof(this._action) === "function") {
-    var actionFunction = this._action.toString();
-  } else {
   var actionCode = this._action.replace(
     /\$(\d+)/g,
     function(match, digits) {
@@ -1009,7 +1006,6 @@ PEG.Grammar.Action.prototype.compile = function(resultVar) {
     "function() { ${actionCode} }",
     { actionCode: actionCode }
   );
-  }
 
   /*
    * In case of sequences, we splat their elements into function arguments one