Replace ${name} with $name where possible.

pkg/analyzer/lib/src/services/formatter_impl.dart

 // Copyright (c) 2013, 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 formatter_impl;
 
 import 'dart:math';
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/src/generated/parser.dart';
@@ skipping 33 matching lines @@
   /// Creates a new FormatterException with an optional error [message].
   const FormatterException([this.message = 'FormatterException']);
 
   FormatterException.forError(List<AnalysisError> errors, [LineInfo line]) :
     message = _createMessage(errors);
 
   static String _createMessage(errors) {
     //TODO(pquitslund): consider a verbosity flag to add/suppress details
     var errorCode = errors[0].errorCode;
     var phase = errorCode is ParserErrorCode ? 'parsing' : 'scanning';
-    return 'An error occured while ${phase} (${errorCode.name}).';
+    return 'An error occured while $phase (${errorCode.name}).';
   }
 
   String toString() => '$message';
 }
 
 /// Specifies the kind of code snippet to format.
 class CodeKind {
 
   final int _index;
 
@@ skipping 134 matching lines @@
       if (!checkTokens()) {
         throwNotEqualException(token1, token2);
       }
       advance();
 
     }
     // TODO(pquitslund): consider a better way to notice trailing synthetics
     if (!isEOF(token2) &&
         !(isCLOSE_CURLY_BRACKET(token2) && isEOF(token2.next))) {
       throw new FormatterException(
-          'Expected "EOF" but got "${token2}".');
+          'Expected "EOF" but got "$token2".');
     }
   }
 
   checkPrecedingComments() {
     var comment1 = token1.precedingComments;
     var comment2 = token2.precedingComments;
     while (comment1 != null) {
       if (comment2 == null) {
         throw new FormatterException(
-            'Expected comment, "${comment1}", at ${describeLocation(token1)}, '
+            'Expected comment, "$comment1", at ${describeLocation(token1)}, '
             'but got none.');
       }
       if (!equivalentComments(comment1, comment2)) {
         throwNotEqualException(comment1, comment2);
       }
       comment1 = comment1.next;
       comment2 = comment2.next;
     }
     if (comment2 != null) {
       throw new FormatterException(
-          'Unexpected comment, "${comment2}", at ${describeLocation(token2)}.');
+          'Unexpected comment, "$comment2", at ${describeLocation(token2)}.');
     }
   }
 
   bool equivalentComments(Token comment1, Token comment2) =>
       comment1.lexeme.trim() == comment2.lexeme.trim();
 
   throwNotEqualException(t1, t2) {
     throw new FormatterException(
-        'Expected "${t1}" but got "${t2}", at ${describeLocation(t1)}.');
+        'Expected "$t1" but got "$t2", at ${describeLocation(t1)}.');
   }
 
   String describeLocation(Token token) => lineInfo == null ? '<unknown>' :
       'Line: ${lineInfo.getLocation(token.offset).lineNumber}, '
       'Column: ${lineInfo.getLocation(token.offset).columnNumber}';
 
   advance() {
     token1 = token1.next;
     token2 = token2.next;
   }
@@ skipping 1595 matching lines @@
   @override
   visitEnumConstantDeclaration(EnumConstantDeclaration node) {
     // TODO: implement visitEnumConstantDeclaration
   }
 
   @override
   visitEnumDeclaration(EnumDeclaration node) {
     // TODO: implement visitEnumDeclaration
   }
 }