Add context for non null prototype error

Author: sebmarkbage

packages/react-client/src/__tests__/ReactFlight-test.js

@@ -1482,7 +1482,10 @@ describe('ReactFlight', () => {
 
     expect(errors).toEqual([
       'Only plain objects, and a few built-ins, can be passed to Client Components ' +
-        'from Server Components. Classes or null prototypes are not supported.',
+        'from Server Components. Classes or null prototypes are not supported.' +
+        (__DEV__
+          ? '\n' + '  <input value={{}}>\n' + '               ^^^^'
+          : '\n' + '  {value: {}}\n' + '          ^^'),
     ]);
   });
 

packages/react-server/src/ReactFlightServer.js

@@ -2615,7 +2615,8 @@ function renderModelDestructive(
     ) {
       throw new Error(
         'Only plain objects, and a few built-ins, can be passed to Client Components ' +
-          'from Server Components. Classes or null prototypes are not supported.',
+          'from Server Components. Classes or null prototypes are not supported.' +
+          describeObjectForErrorMessage(parent, parentPropertyName),
       );
     }
     if (__DEV__) {