Dispose AnalysisContext(s) used to resynthesize CompilationUnitElement(s) for IndexResult(s).

pkg/analyzer/lib/src/dart/analysis/driver.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:async';
 import 'dart:collection';
 import 'dart:typed_data';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart' show CompilationUnitElement;
@@ skipping 574 matching lines @@
     AnalysisResult analysisResult = _computeAnalysisResult(path,
         withUnit: false, asIsIfPartWithoutLibrary: true);
     FileState libraryFile = analysisResult._libraryFile;
     FileState file = analysisResult._file;
 
     // Create the AnalysisContext to resynthesize elements in.
     _LibraryContext libraryContext = _createLibraryContext(libraryFile);
     AnalysisContext analysisContext = _createAnalysisContext(libraryContext);
 
     // Resynthesize the CompilationUnitElement in the context.
-    CompilationUnitElement unitElement = analysisContext.computeResult(
-        new LibrarySpecificUnit(libraryFile.source, file.source),
-        COMPILATION_UNIT_ELEMENT);
+    CompilationUnitElement unitElement;
+    try {
+      unitElement = analysisContext.computeResult(
+          new LibrarySpecificUnit(libraryFile.source, file.source),
+          COMPILATION_UNIT_ELEMENT);
+    } finally {
+      analysisContext.dispose();
+    }
 
     // Return as IndexResult.
     return new IndexResult(unitElement, analysisResult._index);
   }
 
   AnalysisContext _createAnalysisContext(_LibraryContext libraryContext) {
     AnalysisContextImpl analysisContext =
         AnalysisEngine.instance.createAnalysisContext();
     analysisContext.analysisOptions = analysisOptions;
 
@@ skipping 686 matching lines @@
 }
 
 /**
  * TODO(scheglov) document
  */
 class _LibraryContext {
   final FileState file;
   final SummaryDataStore store;
   _LibraryContext(this.file, this.store);
 }