From 70046475a361d2ba180bf23b6a6ba154f7dae166 Mon Sep 17 00:00:00 2001
From: Stefan Behnel <stefan_ml@behnel.de>
Date: Mon, 26 Jul 2021 10:05:59 +0200
Subject: Fix type declaration in parser.

---
 Cython/Compiler/Parsing.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Cython/Compiler/Parsing.py b/Cython/Compiler/Parsing.py
index a1a3a7392..3d389f6fc 100644
--- a/Cython/Compiler/Parsing.py
+++ b/Cython/Compiler/Parsing.py
@@ -2793,10 +2793,10 @@ sign_and_longness_words = cython.declare(frozenset, frozenset((
     "short", "long", "signed", "unsigned")))
 
 base_type_start_words = cython.declare(
-    set,
+    frozenset,
     basic_c_type_names
     | sign_and_longness_words
-    | set(special_basic_c_types))
+    | frozenset(special_basic_c_types))
 
 struct_enum_union = cython.declare(frozenset, frozenset((
     "struct", "union", "enum", "packed")))
-- 
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