WIP initial YIELD_FROM implementation

TODO: check for StopIteration

batavia/VirtualMachine.js

@@ -1847,6 +1847,15 @@ VirtualMachine.prototype.byte_YIELD_VALUE = function() {
     return 'yield'
 }
 
+VirtualMachine.prototype.byte_YIELD_FROM = function() {
+    var v = this.pop()
+    var receiver = this.top()
+
+    this.return_value = receiver.send(v)
+    this.jump(this.frame.f_lasti - 1)
+    return 'yield'
+}
+
 // VirtualMachine.prototype.byte_YIELD_FROM = function {
 //         u = this.pop()
 //         x = this.top()

tests/structures/test_generator.py

@@ -193,3 +193,18 @@ def G():
             except BaseException as e:
                 print(type(e), e)
         """)
+
+
+class YieldFromTests(TranspileTestCase):
+    def test_regular_generator(self):
+        self.assertCodeExecution("""
+            def G(x):
+                yield from x
+
+            def F():
+                yield 1
+                yield 2
+
+            g = G(F())
+            print(list(g))
+        """)