From 975c696fa934692ddc3ca6eeca199cdda784927a Mon Sep 17 00:00:00 2001
From: Darren Burns <darrenb900@gmail.com>
Date: Wed, 15 Jun 2022 11:07:48 +0100
Subject: [PATCH] Reintroduce button variant repetition and set

---
 src/textual/widgets/_button.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/textual/widgets/_button.py b/src/textual/widgets/_button.py
index e5442ecf5..51c042687 100644
--- a/src/textual/widgets/_button.py
+++ b/src/textual/widgets/_button.py
@@ -18,7 +18,7 @@ from ..reactive import Reactive
 from ..widget import Widget
 
 ButtonVariant = Literal["default", "success", "warning", "error"]
-_VALID_BUTTON_VARIANTS = ButtonVariant.__args__  # type: ignore
+_VALID_BUTTON_VARIANTS = {"default", "success", "warning", "error"}
 
 
 class InvalidButtonVariant(Exception):