generators can now be indexed, don't know if this is a good thing. however, it fixes some problems with lists

test/completion/generators.py

@@ -0,0 +1,32 @@
+# -----------------
+# yield statement
+# -----------------
+
+def gen():
+    yield 1
+    yield ""
+
+gen_exe = gen()
+#? ['upper']
+next(gen_exe).upper
+#? ['real']
+next(gen_exe).real
+#? int() str()
+next(gen_exe)
+
+#? int() str() list
+next(gen_exe, list)
+
+# -----------------
+# generators should be indexable?
+# -----------------
+def get(self):
+    yield 1
+    yield ""
+
+arr = []
+for a in arr:
+    arr += get()
+
+#? int() str()
+arr[0].