context.patch

diff --git a/src/addons/__tests__/ReactComponentWithPureRenderMixin-test.js b/src/addons/__tests__/ReactComponentWithPureRenderMixin-test.js
index 2f5c7a3..77b6164 100644
--- a/src/addons/__tests__/ReactComponentWithPureRenderMixin-test.js
+++ b/src/addons/__tests__/ReactComponentWithPureRenderMixin-test.js
@@ -24,7 +24,7 @@ describe('ReactComponentWithPureRenderMixin', () => {
     ReactTestUtils = require('ReactTestUtils');
   });
 
-  it('provides a default shouldComponentUpdate implementation', () => {
+  fit('provides a default shouldComponentUpdate implementation', () => {
     var renderCalls = 0;
     class PlasticWrap extends React.Component {
       constructor(props, context) {
diff --git a/src/renderers/shared/fiber/ReactFiberContext.js b/src/renderers/shared/fiber/ReactFiberContext.js
index 2479939..193a234 100644
--- a/src/renderers/shared/fiber/ReactFiberContext.js
+++ b/src/renderers/shared/fiber/ReactFiberContext.js
@@ -77,6 +77,9 @@ function isContextProvider(fiber : Fiber) : boolean {
 exports.isContextProvider = isContextProvider;
 
 function popContextProvider() : void {
+console.log('popping', index);
+console.log(new Error().stack);
+if (index === -1) { throw new Error('popping -1'); }
   contextStack[index] = emptyObject;
   didPerformWorkStack[index] = false;
   index--;
@@ -87,6 +90,8 @@ exports.pushTopLevelContextObject = function(context : Object, didChange : boole
   invariant(index === -1, 'Unexpected context found on stack');
   index++;
   contextStack[index] = context;
+console.log('pushing top-level', index);
+console.log(new Error().stack);
   didPerformWorkStack[index] = didChange;
 };
 
@@ -126,6 +131,8 @@ exports.pushContextProvider = function(fiber : Fiber, didPerformWork : boolean)
 
   index++;
   contextStack[index] = mergedContext;
+console.log('pushing', index);
+console.log(new Error().stack);
   didPerformWorkStack[index] = didPerformWork;
 };