Handle escapes in string literals.

frog/leg/ssa/builder.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.
 
 class Interceptors {
   Compiler compiler;
   Interceptors(Compiler this.compiler);
 
   SourceString mapOperatorToMethodName(Operator op) {
     String name = op.source.stringValue;
@@ skipping 1133 matching lines @@
 
   void visitLiteralDouble(LiteralDouble node) {
     push(new HLiteral(node.value, HType.DOUBLE));
   }
 
   void visitLiteralBool(LiteralBool node) {
     push(new HLiteral(node.value, HType.BOOLEAN));
   }
 
   void visitLiteralString(LiteralString node) {
-    if (node.value.stringValue[0] == '@') {
-      compiler.unimplemented("SsaBuilder: raw strings", node: node);
-    }
     push(new HLiteral(new QuotedString.explicit(node.value), HType.STRING));
   }
 
   void visitLiteralNull(LiteralNull node) {
     push(new HLiteral(null, HType.UNKNOWN));
   }
 
   visitNodeList(NodeList node) {
     for (Link<Node> link = node.nodes; !link.isEmpty(); link = link.tail) {
       visit(link.head);
@@ skipping 251 matching lines @@
   }
 
   visitCatchBlock(CatchBlock node) {
     compiler.unimplemented('SsaBuilder.visitCatchBlock', node: node);
   }
 
   visitTypedef(Typedef node) {
     compiler.unimplemented('SsaBuilder.visitTypedef', node: node);
   }
 }