Silence a bunch of annoying bogus dartanalyzer warnings.

sky/sdk/lib/framework/rendering/object.dart

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 import '../node.dart';
 import '../scheduler.dart' as scheduler;
 import 'dart:math' as math;
 import 'dart:sky' as sky;
 
 class ParentData {
@@ skipping 26 matching lines @@
   }
 }
 
 abstract class RenderObject extends AbstractNode {
 
   // LAYOUT
 
   // parentData is only for use by the RenderObject that actually lays this
   // node out, and any other nodes who happen to know exactly what
   // kind of node that is.
-  ParentData parentData;
+  dynamic parentData; // TODO(ianh): change the type of this back to ParentData once the analyzer is cleverer
   void setParentData(RenderObject child) {
     // override this to setup .parentData correctly for your class
     assert(!_debugDoingLayout);
     assert(!debugDoingPaint);
     if (child.parentData is! ParentData)
       child.parentData = new ParentData();
   }
 
   void adoptChild(RenderObject child) { // only for use by subclasses
     // call this whenever you decide a node is a child
@@ skipping 42 matching lines @@
   void markNeedsLayout() {
     assert(!_debugDoingLayout);
     assert(!debugDoingPaint);
     if (_needsLayout) {
       assert(debugAncestorsAlreadyMarkedNeedsLayout());
       return;
     }
     _needsLayout = true;
     assert(_relayoutSubtreeRoot != null);
     if (_relayoutSubtreeRoot != this) {
+      final parent = this.parent; // TODO(ianh): Remove this once the analyzer is cleverer
       assert(parent is RenderObject);
       parent.markNeedsLayout();
+      assert(parent == this.parent); // TODO(ianh): Remove this once the analyzer is cleverer
     } else {
       _nodesNeedingLayout.add(this);
       scheduler.ensureVisualUpdate();
     }
   }
   static void flushLayout() {
     _debugDoingLayout = true;
     List<RenderObject> dirtyNodes = _nodesNeedingLayout;
     _nodesNeedingLayout = new List<RenderObject>();
     dirtyNodes..sort((a, b) => a.depth - b.depth)..forEach((node) {
       if (node._needsLayout && node.attached)
         node._doLayout();
     });
     _debugDoingLayout = false;
   }
   void _doLayout() {
     try {
       assert(_relayoutSubtreeRoot == this);
       performLayout();
     } catch (e, stack) {
       print('Exception raised during layout of ${this}: ${e}');
       print(stack);
       return;
     }
     _needsLayout = false;
   }
   void layout(dynamic constraints, { bool parentUsesSize: false }) {
+    final parent = this.parent; // TODO(ianh): Remove this once the analyzer is cleverer
     RenderObject relayoutSubtreeRoot;
     if (!parentUsesSize || sizedByParent || parent is! RenderObject)
       relayoutSubtreeRoot = this;
     else
       relayoutSubtreeRoot = parent._relayoutSubtreeRoot;
+    assert(parent == this.parent); // TODO(ianh): Remove this once the analyzer is cleverer
     if (!needsLayout && constraints == _constraints && relayoutSubtreeRoot == _relayoutSubtreeRoot)
       return;
     _constraints = constraints;
     _relayoutSubtreeRoot = relayoutSubtreeRoot;
     if (sizedByParent)
       performResize();
     performLayout();
     _needsLayout = false;
     markNeedsPaint();
+    assert(parent == this.parent); // TODO(ianh): Remove this once the analyzer is cleverer
   }
   bool get sizedByParent => false; // return true if the constraints are the only input to the sizing algorithm (in particular, child nodes have no impact)
   void performResize(); // set the local dimensions, using only the constraints (only called if sizedByParent is true)
   void performLayout();
     // Override this to perform relayout without your parent's
     // involvement.
     //
     // This is called during layout. If sizedByParent is true, then
     // performLayout() should not change your dimensions, only do that
     // in performResize(). If sizedByParent is false, then set both
@@ skipping 87 matching lines @@
   RenderObject get result => path.first;
 
   void add(RenderObject node) {
     path.add(node);
   }
 }
 
 
 // GENERIC MIXIN FOR RENDER NODES WITH ONE CHILD
 
-abstract class RenderObjectWithChildMixin<ChildType extends RenderObject> {
+abstract class RenderObjectWithChildMixin<ChildType extends RenderObject> implements RenderObject {
   ChildType _child;
   ChildType get child => _child;
   void set child (ChildType value) {
     if (_child != null)
       dropChild(_child);
     _child = value;
     if (_child != null)
       adoptChild(_child);
   }
   void attachChildren() {
@@ skipping 164 matching lines @@
     int count = 1;
     ChildType child = _firstChild;
     while (child != null) {
       result += '${prefix}child ${count}: ${child.toString(prefix)}';
       count += 1;
       child = child.parentData.nextSibling;
     }
     return result;
   }
 }