Allow AstBuilder to report parse errors.

pkg/analyzer/lib/src/dart/analysis/file_state.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:convert';
 import 'dart:typed_data';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/error/listener.dart';
@@ skipping 341 matching lines @@
   /**
    * Return a new parsed unresolved [CompilationUnit].
    */
   CompilationUnit parse(AnalysisErrorListener errorListener) {
     AnalysisOptions analysisOptions = _fsState._analysisOptions;
 
     if (USE_FASTA_PARSER) {
       try {
         fasta.ScannerResult scanResult = fasta.scan(_contentBytes);
 
-        var listener = new fasta.AstBuilder(null, null,
-            new _FastaElementStoreProxy(), new _FastaEmptyScope(), uri);
-        var parser = new fasta.Parser(listener);
+        var astBuilder = new fasta.AstBuilder(
+            new ErrorReporter(errorListener, source),
+            null,
+            null,
+            new _FastaElementStoreProxy(),
+            new _FastaEmptyScope(),
+            uri);
+        var parser = new fasta.Parser(astBuilder);
         parser.parseUnit(scanResult.tokens);
-        var unit = listener.pop() as CompilationUnit;
+        var unit = astBuilder.pop() as CompilationUnit;
 
         LineInfo lineInfo = new LineInfo(scanResult.lineStarts);
         unit.lineInfo = lineInfo;
         return unit;
       } catch (e, st) {
         print(e);
         print(st);
         rethrow;
       }
     } else {
@@ skipping 419 matching lines @@
   noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
 }
 
 class _FastaEmptyScope extends fasta.Scope {
   _FastaEmptyScope() : super({}, null);
 }
 
 class _FastaInterfaceTypeProxy implements fasta.KernelInterfaceType {
   noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
 }