From 31e6576971aa95354ec39f58ca886cd0a67bffdd Mon Sep 17 00:00:00 2001
From: Alex Waygood <Alex.Waygood@Gmail.com>
Date: Tue, 29 Apr 2025 13:35:53 +0100
Subject: [PATCH] [red-knot] micro-optimise `ClassLiteral::is_protocol`
 (#17703)

---
 crates/red_knot_python_semantic/src/types/class.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crates/red_knot_python_semantic/src/types/class.rs b/crates/red_knot_python_semantic/src/types/class.rs
index b3c28473fc..0a48704475 100644
--- a/crates/red_knot_python_semantic/src/types/class.rs
+++ b/crates/red_knot_python_semantic/src/types/class.rs
@@ -534,7 +534,7 @@ impl<'db> ClassLiteral<'db> {
 
     /// Determine if this class is a protocol.
     pub(super) fn is_protocol(self, db: &'db dyn Db) -> bool {
-        self.explicit_bases(db).iter().any(|base| {
+        self.explicit_bases(db).iter().rev().take(3).any(|base| {
             matches!(
                 base,
                 Type::KnownInstance(KnownInstanceType::Protocol)