From c9892da871b5d5b1a3d1597af5a7953f0c243dd2 Mon Sep 17 00:00:00 2001
From: Nick Pope <nick@nickpope.me.uk>
Date: Tue, 8 Jul 2025 09:33:14 +0100
Subject: [PATCH] perf: add `__slots__` to `SubtypeContext`

Follow up to afd5a382dc95532da61e6ebc7002323fbca75548.
---
 mypy/subtypes.py | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/mypy/subtypes.py b/mypy/subtypes.py
index 428e6dec6749..d7388e3bbdf5 100644
--- a/mypy/subtypes.py
+++ b/mypy/subtypes.py
@@ -89,6 +89,17 @@
 
 
 class SubtypeContext:
+    __slots__ = (
+        "ignore_type_params",
+        "ignore_pos_arg_names",
+        "ignore_declared_variance",
+        "always_covariant",
+        "ignore_promotions",
+        "erase_instances",
+        "keep_erased_types",
+        "options",
+    )
+
     def __init__(
         self,
         *,