Spelling fixes e to i.

pkg/kernel/lib/transformations/treeshaker.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.
 
 library kernel.tree_shaker;
 
 import '../ast.dart';
 import '../class_hierarchy.dart';
 import '../core_types.dart';
 import '../type_environment.dart';
@@ skipping 109 matching lines @@
   /// Map from classes to the set of members that are reachable with that
   /// class as host.
   ///
   /// The map is implemented as a list, indexed according to
   /// [ClassHierarchy.getClassIndex].
   final List<Set<Member>> _usedMembersWithHost;
 
   /// Map from used members (regardless of host) to a summary object describing
   /// how the member invokes other members on `this`.
   ///
-  /// The summary object is a heterogenous list containing the [Member]s that
+  /// The summary object is a heterogeneous list containing the [Member]s that
   /// are invoked using `super` and the [Name]s that are dispatched on `this`.
   ///
   /// Names that are dispatched as a setter are preceded by the
   /// [_setterSentinel] object, to distinguish them from getter/call names.
   final Map<Member, List<Node>> _usedMembers = <Member, List<Node>>{};
 
   /// The level to which a class must be retained after tree shaking.
   ///
   /// See [ClassRetention].
   final List<ClassRetention> _classRetention;
@@ skipping 939 matching lines @@
         classNode == coreTypes.futureClass ||
         classNode == coreTypes.streamClass ||
         classNode == coreTypes.listClass ||
         classNode == coreTypes.mapClass;
   }
 }
 
 /// Exception that is thrown to stop the tree shaking analysis when a use
 /// of `dart:mirrors` is found.
 class _UsingMirrorsException {}