Fit into 80 limit.

lib/compiler/implementation/tree/unparser.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.
 
 String unparse(Node node) {
   Unparser unparser = new Unparser();
   unparser.unparse(node);
   return unparser.result;
 }
 
@@ skipping 251 matching lines @@
     String opString = op !== null ? op.source.stringValue : null;
     bool spacesNeeded = opString === 'is' || opString === 'as';
 
     if (node.isPrefix) visit(node.selector);
     unparseSendReceiver(node, spacesNeeded: spacesNeeded);
     if (!node.isPrefix && !node.isIndex) visit(node.selector);
     if (spacesNeeded) sb.add(' ');
     // Also add a space for sequences like x + +1 and y - -y.
     if (opString === '-' || opString === '+') {
       Token beginToken = node.argumentsNode.getBeginToken();
-      if (beginToken !== null && beginToken.stringValue === opString) sb.add(' ');
+      if (beginToken !== null && beginToken.stringValue === opString) {
+        sb.add(' ');
+      }
     }
     visit(node.argumentsNode);
   }
 
   visitSendSet(SendSet node) {
     if (node.isPrefix) {
       sb.add(' ');
       visit(node.assignmentOperator);
     }
     unparseSendReceiver(node);
@@ skipping 253 matching lines @@
     add(node.getEndToken().value);
   }
 
   visitPartOf(PartOf node) {
     addToken(node.partKeyword);
     addToken(node.ofKeyword);
     visit(node.name);
     add(node.getEndToken().value);
   }
 }