Spelling fixes e to i.

pkg/compiler/lib/src/tree/nodes.dart

 // Copyright (c) 2012, 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:collection' show IterableMixin;
 
 import 'package:front_end/src/fasta/fasta_codes.dart' show FastaMessage;
 import 'package:front_end/src/fasta/scanner.dart' show Token;
 import 'package:front_end/src/fasta/scanner/token_constants.dart' as Tokens
     show PLUS_TOKEN;
@@ skipping 1266 matching lines @@
     // No string quotes with 2 characters.
     null,
     null,
     null,
     null,
     // Multiline quotings.
     const StringQuoting($SQ, raw: false, leftQuoteLength: 3),
     const StringQuoting($SQ, raw: true, leftQuoteLength: 3),
     const StringQuoting($DQ, raw: false, leftQuoteLength: 3),
     const StringQuoting($DQ, raw: true, leftQuoteLength: 3),
-    // Leading single whitespace or espaped newline.
+    // Leading single whitespace or escaped newline.
     const StringQuoting($SQ, raw: false, leftQuoteLength: 4),
     const StringQuoting($SQ, raw: true, leftQuoteLength: 4),
     const StringQuoting($DQ, raw: false, leftQuoteLength: 4),
     const StringQuoting($DQ, raw: true, leftQuoteLength: 4),
     // Other combinations of leading whitespace and/or escaped newline.
     const StringQuoting($SQ, raw: false, leftQuoteLength: 5),
     const StringQuoting($SQ, raw: true, leftQuoteLength: 5),
     const StringQuoting($DQ, raw: false, leftQuoteLength: 5),
     const StringQuoting($DQ, raw: true, leftQuoteLength: 5),
     const StringQuoting($SQ, raw: false, leftQuoteLength: 6),
@@ skipping 1985 matching lines @@
  */
 Object getTreeElement(TreeElementMixin node) => node._element;
 
 /**
  * Do not call this method directly.  Instead, use an instance of
  * TreeElements.
  */
 void setTreeElement(TreeElementMixin node, Object value) {
   node._element = value;
 }