Resynthesize ParameterElementImpl.parameterKind lazily.

pkg/analyzer/lib/src/dart/element/element.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.dart.element.element;
 
 import 'dart:collection';
 import 'dart:math' show min;
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 5760 matching lines @@
   /**
    * A list containing all of the type parameters defined for this parameter
    * element. There will only be parameters if this parameter is a function
    * typed parameter.
    */
   List<TypeParameterElement> _typeParameters = TypeParameterElement.EMPTY_LIST;
 
   /**
    * The kind of this parameter.
    */
-  ParameterKind parameterKind;
+  ParameterKind _parameterKind;
 
   /**
    * The Dart code of the default value.
    */
   String _defaultValueCode;
 
   /**
    * The offset to the beginning of the visible range for this element.
    */
   int _visibleRangeOffset = 0;
@@ skipping 149 matching lines @@
     if (_unlinkedParam != null) {
       if (isSynthetic) {
         return -1;
       }
       return _unlinkedParam.nameOffset;
     }
     return super.nameOffset;
   }
 
   @override
+  ParameterKind get parameterKind {
+    if (_unlinkedParam != null && _parameterKind == null) {
+      switch (_unlinkedParam.kind) {
+        case UnlinkedParamKind.named:
+          _parameterKind = ParameterKind.NAMED;
+          break;
+        case UnlinkedParamKind.positional:
+          _parameterKind = ParameterKind.POSITIONAL;
+          break;
+        case UnlinkedParamKind.required:
+          _parameterKind = ParameterKind.REQUIRED;
+          break;
+      }
+    }
+    return _parameterKind;
+  }
+
+  void set parameterKind(ParameterKind parameterKind) {
+    assert(_unlinkedParam == null);
+    _parameterKind = parameterKind;
+  }
+
+  @override
   List<ParameterElement> get parameters => _parameters;
 
   /**
    * Set the parameters defined by this executable element to the given
    * [parameters].
    */
   void set parameters(List<ParameterElement> parameters) {
     for (ParameterElement parameter in parameters) {
       (parameter as ParameterElementImpl).enclosingElement = this;
     }
@@ skipping 1093 matching lines @@
 
   @override
   void visitElement(Element element) {
     int offset = element.nameOffset;
     if (offset != -1) {
       map[offset] = element;
     }
     super.visitElement(element);
   }
 }