Fix accidental bug in yield* desugaring.

src/parsing/parser.h

Index: src/parsing/parser.h
diff --git a/src/parsing/parser.h b/src/parsing/parser.h
index d4fb62f02c041fce4d752fda56a4d979b564d622..5c5a52a164b122a8e27caeeffa600c5b436318d8 100644
--- a/src/parsing/parser.h
+++ b/src/parsing/parser.h
@@ -670,9 +670,8 @@ class ParserTraits {
  private:
   Parser* parser_;
 
-  void BuildIteratorClose(
-      ZoneList<Statement*>* statements, Variable* iterator,
-      Expression* input, Variable* output);
+  void BuildIteratorClose(ZoneList<Statement*>* statements, Variable* iterator,
+                          Maybe<Variable*> input, Variable* output);
   void BuildIteratorCloseForCompletion(
       ZoneList<Statement*>* statements, Variable* iterator,
       Variable* body_threw);