Replace ${name} with $name where possible.

pkg/analyzer/lib/src/generated/testing/ast_factory.dart

 // Copyright (c) 2014, 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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.testing.ast_factory;
 
 import 'package:analyzer/src/generated/utilities_dart.dart';
@@ skipping 322 matching lines @@
   static SimpleFormalParameter simpleFormalParameter(Keyword keyword, String parameterName) => simpleFormalParameter2(keyword, null, parameterName);
 
   static SimpleFormalParameter simpleFormalParameter2(Keyword keyword, TypeName type, String parameterName) => new SimpleFormalParameter(null, null, keyword == null ? null : TokenFactory.tokenFromKeyword(keyword), type, identifier3(parameterName));
 
   static SimpleFormalParameter simpleFormalParameter3(String parameterName) => simpleFormalParameter2(null, null, parameterName);
 
   static SimpleFormalParameter simpleFormalParameter4(TypeName type, String parameterName) => simpleFormalParameter2(null, type, parameterName);
 
   static StringInterpolation string(List<InterpolationElement> elements) => new StringInterpolation(list(elements));
 
-  static SimpleStringLiteral string2(String content) => new SimpleStringLiteral(TokenFactory.tokenFromString("'${content}'"), content);
+  static SimpleStringLiteral string2(String content) => new SimpleStringLiteral(TokenFactory.tokenFromString("'$content'"), content);
 
   static SuperConstructorInvocation superConstructorInvocation(List<Expression> arguments) => superConstructorInvocation2(null, arguments);
 
   static SuperConstructorInvocation superConstructorInvocation2(String name, List<Expression> arguments) => new SuperConstructorInvocation(TokenFactory.tokenFromKeyword(Keyword.SUPER), name == null ? null : TokenFactory.tokenFromType(TokenType.PERIOD), name == null ? null : identifier3(name), argumentList(arguments));
 
   static SuperExpression superExpression() => new SuperExpression(TokenFactory.tokenFromKeyword(Keyword.SUPER));
 
   static SwitchCase switchCase(Expression expression, List<Statement> statements) => switchCase2(new List<Label>(), expression, statements);
 
   static SwitchCase switchCase2(List<Label> labels, Expression expression, List<Statement> statements) => new SwitchCase(labels, TokenFactory.tokenFromKeyword(Keyword.CASE), expression, TokenFactory.tokenFromType(TokenType.COLON), list(statements));
@@ skipping 92 matching lines @@
   static VariableDeclarationStatement variableDeclarationStatement2(Keyword keyword, List<VariableDeclaration> variables) => variableDeclarationStatement(keyword, null, variables);
 
   static WhileStatement whileStatement(Expression condition, Statement body) => new WhileStatement(TokenFactory.tokenFromKeyword(Keyword.WHILE), TokenFactory.tokenFromType(TokenType.OPEN_PAREN), condition, TokenFactory.tokenFromType(TokenType.CLOSE_PAREN), body);
 
   static WithClause withClause(List<TypeName> types) => new WithClause(TokenFactory.tokenFromKeyword(Keyword.WITH), list(types));
 
   static YieldStatement yieldEachStatement(Expression expression) => new YieldStatement(TokenFactory.tokenFromTypeAndString(TokenType.IDENTIFIER, "yield"), TokenFactory.tokenFromType(TokenType.STAR), expression, TokenFactory.tokenFromType(TokenType.SEMICOLON));
 
   static YieldStatement yieldStatement(Expression expression) => new YieldStatement(TokenFactory.tokenFromTypeAndString(TokenType.IDENTIFIER, "yield"), null, expression, TokenFactory.tokenFromType(TokenType.SEMICOLON));
 }