Don't short circuit visiting else

pkg/analyzer/lib/src/generated/resolver.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.
 
 library analyzer.src.generated.resolver;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
@@ skipping 3672 matching lines @@
         // if(true) ...
         return _nodeExits(thenStatement);
       } else if (elseStatement != null) {
         // if (false) ...
         return _nodeExits(elseStatement);
       }
     }
     if (thenStatement == null || elseStatement == null) {
       return false;
     }
-    return _nodeExits(thenStatement) && _nodeExits(elseStatement);
+    bool thenExits = _nodeExits(thenStatement);
+    bool elseExits = _nodeExits(elseStatement);
+    return thenExits && elseExits;
   }
 
   @override
   bool visitIndexExpression(IndexExpression node) {
     Expression target = node.realTarget;
     if (_nodeExits(target)) {
       return true;
     }
     if (_nodeExits(node.index)) {
       return true;
@@ skipping 7275 matching lines @@
       return null;
     }
     if (identical(node.staticElement, variable)) {
       if (node.inSetterContext()) {
         result = true;
       }
     }
     return null;
   }
 }