Leaving a generator via an exception causes it to close

src/messages.js

Index: src/messages.js
diff --git a/src/messages.js b/src/messages.js
index 049cecde445d595cc2353ed2860df8254507d14b..2b23812d0a4abe98c8691545cf9609bce29c0341 100644
--- a/src/messages.js
+++ b/src/messages.js
@@ -9,9 +9,8 @@ var kMessages = {
   cyclic_proto:                  ["Cyclic __proto__ value"],
   code_gen_from_strings:         ["%0"],
   constructor_special_method:    ["Class constructor may not be an accessor"],
-  generator_running:             ["Generator is already running"],
-  generator_finished:            ["Generator has already finished"],
   // TypeError
+  generator_running:             ["Generator is already running"],
   unexpected_token:              ["Unexpected token ", "%0"],
   unexpected_token_number:       ["Unexpected number"],
   unexpected_token_string:       ["Unexpected string"],