Not task based analysis.

pkg/analyzer/test/src/dart/analysis/driver_test.dart

 // Copyright (c) 2016, 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.test.driver;
 
 import 'dart:async';
 import 'dart:convert';
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 2037 matching lines @@
             return variable;
           }
         }
       }
     }
     fail('Cannot find the top-level variable $name in\n$unit');
     return null;
   }
 
   String _getTopLevelVarType(CompilationUnit unit, String name) {
+    VariableDeclaration variable = _getTopLevelVar(unit, name);
     return resolutionMap
-        .elementDeclaredByVariableDeclaration(_getTopLevelVar(unit, name))
+        .elementDeclaredByVariableDeclaration(variable)
         .type
         .toString();
   }
 
   /**
    * Return the [provider] specific path for the given Posix [path].
    */
   String _p(String path) => provider.convertPath(path);
 
   static String _md5(String content) {
     return hex.encode(md5.convert(UTF8.encode(content)).bytes);
   }
 }
 
 class _SourceMock extends TypedMock implements Source {}