Replace ${name} with $name where possible.

pkg/analyzer/lib/src/analyzer_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 analyzer_impl;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'generated/constant.dart';
@@ skipping 154 matching lines @@
       // print errors and performance numbers
       _printErrorsAndPerf();
 
       // compute max severity and set exitCode
       ErrorSeverity status = maxErrorSeverity;
       if (status == ErrorSeverity.WARNING && options.warningsAreFatal) {
         status = ErrorSeverity.ERROR;
       }
       exitCode = status.ordinal;
     }).catchError((ex, st) {
-      AnalysisEngine.instance.logger.logError("${ex}\n${st}");
+      AnalysisEngine.instance.logger.logError("$ex\n$st");
     });
   }
 
   bool _isDesiredError(AnalysisError error) {
     if (error.errorCode.type == ErrorType.TODO) {
       return false;
     }
     if (computeSeverity(error, options.enableTypeChecks) == ErrorSeverity.INFO
         && options.disableHints) {
       return false;
@@ skipping 241 matching lines @@
     }
   }
 
   @override
   void logInformation2(String message, Exception exception) {
     if (log) {
       stdout.writeln(message);
     }
   }
 }