Resynthesize top-level functions from Kernel.

pkg/analyzer/test/src/summary/element_text.dart

 // Copyright (c) 2017, 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.
 
 import 'dart:io';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
@@ skipping 406 matching lines @@
       writeExpression(e.name);
       if (e.typeArguments != null) {
         writeList('<', '>', e.typeArguments.arguments, ', ', writeExpression);
       }
     } else {
       fail('Unsupported expression type: ${e.runtimeType}');
     }
   }
 
   void writeFunctionElement(FunctionElement e) {
+    writeDocumentation(e);
+    writeMetadata(e, '', '\n');
+
     writeIf(e.isExternal, 'external ');
 
     writeType2(e.returnType);
 
     writeName(e);
 
     writeTypeParameterElements(e.typeParameters);
     writeParameterElements(e.parameters);
 
     writeBodyModifiers(e);
@@ skipping 399 matching lines @@
     return components.join(';');
   }
 }
 
 class _Replacement {
   final int offset;
   final int end;
   final String text;
   _Replacement(this.offset, this.end, this.text);
 }