cover additional fully sync generator case

Author: alexeyraspopov

modules/Coroutine.js

@@ -80,7 +80,9 @@ function resolveSyncIterator(i, step, cb) {
         .then(data => resolveSyncIterator(i, i.next(data), cb))
         .catch(error => resolveSyncIterator(i, i.throw(error), cb));
     } else {
-      return resolveSyncIterator(i, i.next(step.value), cb);
+      let isErrorLike = step.value instanceof Error;
+      let nextStep = isErrorLike ? i.throw(step.value) : i.next(step.value);
+      return resolveSyncIterator(i, nextStep, cb);
     }
   } else {
     return cb(step.value);

modules/__tests__/Coroutine-test.js

@@ -62,7 +62,23 @@ describe('Coroutine', () => {
     expect(tree.toJSON()).toEqual(result.toJSON());
   });
 
-  it('should rethrow exceptions back to generator', async () => {
+  it('should rethrow exceptions back to generator in async mode', () => {
+    function* render() {
+      try {
+        yield new Error('Boom');
+      } catch (error) {
+        return <p>{error.message}</p>;
+      }
+    }
+
+    let TestComponent = Coroutine.create(render);
+    let tree = Renderer.create(<TestComponent />);
+
+    let result = Renderer.create(<p>Boom</p>);
+    expect(tree.toJSON()).toEqual(result.toJSON());
+  });
+
+  it('should rethrow exceptions back to generator in async mode', async () => {
     function* render() {
       try {
         yield Promise.reject(new Error('Boom'));

package.json

@@ -62,11 +62,11 @@
   },
   "size-limit": [
     {
-      "limit": "776 B",
+      "limit": "800 B",
       "path": "build/react-coroutine.js"
     },
     {
-      "limit": "782 B",
+      "limit": "804 B",
       "path": "build/react-coroutine.module.js"
     }
   ]