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 b429fbef3f329949682e76bbafc2c358d7142ad4..13b8a276a6485d2282dc382858693470c7cfa5e8 100644
--- a/src/parsing/parser.h
+++ b/src/parsing/parser.h
@@ -761,9 +761,10 @@ class Parser : public ParserBase<ParserTraits> {
                                bool* ok);
   Statement* ParseStatementAsUnlabelled(ZoneList<const AstRawString*>* labels,
                                    bool* ok);
-  Statement* ParseFunctionDeclaration(ZoneList<const AstRawString*>* names,
+  Statement* ParseFunctionDeclaration(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,