Spelling fixes e to i.

tests/corelib/set_test.dart

 // Copyright (c) 2011, 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 set_test;
 
 import 'package:expect/expect.dart';
 import "dart:collection";
 
 void testMain(Set create()) {
@@ skipping 344 matching lines @@
   Expect.identical(ce3, difference.lookup(ce3));
 
   // Difference uses other.contains to check for equality.
   var set3 = create(identical, identityHashCode, null, identityCompare);
   set3.add(ce1b);
   difference = set1.difference(set3);
   testLength(2, difference); // ce1a is not identical to element in set3.
   Expect.identical(ce1a, difference.lookup(ce1a));
   Expect.identical(ce2, difference.lookup(ce2));
 
-  // Intesection always takes elements from receiver set.
+  // Intersection always takes elements from receiver set.
   var intersection = set1.intersection(set2);
   testLength(1, intersection);
   Expect.identical(ce1a, intersection.lookup(ce1a));
 
   intersection = set1.intersection(set3);
   testLength(0, intersection);
 }
 
 // Objects that are equal based on data.
 class CE implements Comparable<CE> {
@@ skipping 165 matching lines @@
 
   testCESetFrom(
       (x) => new SplayTreeSet<CE>.from(x, customCompare(20), validKey));
   testCESetFrom((x) => new SplayTreeSet<CE>.from(x, identityCompare));
 
   testASetFrom((x) => new Set<A>.from(x));
   testASetFrom((x) => new HashSet<A>.from(x));
   testASetFrom((x) => new LinkedHashSet<A>.from(x));
   testASetFrom((x) => new SplayTreeSet<A>.from(x, identityCompare));
 }