Disallow generator declarations in certain locations

src/parsing/parser.h

Index: src/parsing/parser.h
diff --git a/src/parsing/parser.h b/src/parsing/parser.h
index f971cf7661ceae42c3007c19300e11a1d9c7cbf2..5857291830a75942fec534ce9bb9f05cf6836880 100644
--- a/src/parsing/parser.h
+++ b/src/parsing/parser.h
@@ -759,9 +759,10 @@ class Parser : public ParserBase<ParserTraits> {
                                bool* ok);
   Statement* ParseStatementAsUnlabelled(ZoneList<const AstRawString*>* labels,
                                    bool* ok);
-  Statement* ParseFunctionDeclaration(ZoneList<const AstRawString*>* names,
+  Statement* ParseHoistableDeclaration(bool* ok);
+  Statement* ParseHoistableDeclaration(ZoneList<const AstRawString*>* names,
                                       bool* ok);
-  Statement* ParseFunctionDeclaration(int pos, bool is_generator,
+  Statement* ParseHoistableDeclaration(int pos, bool is_generator,
                                       ZoneList<const AstRawString*>* names,
                                       bool* ok);
   Statement* ParseClassDeclaration(ZoneList<const AstRawString*>* names,