From 581a9916fe14b6a6ae8656c0011e682b8a32ccd0 Mon Sep 17 00:00:00 2001
From: chriseth <chris@ethereum.org>
Date: Tue, 29 Jul 2025 15:58:45 +0200
Subject: [PATCH] Group into btreeset directly (#3105)

Co-authored-by: Georg Wiese <georgwiese@gmail.com>
---
 constraint-solver/src/indexed_constraint_system.rs | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/constraint-solver/src/indexed_constraint_system.rs b/constraint-solver/src/indexed_constraint_system.rs
index d4ba530a8..14b75b5b6 100644
--- a/constraint-solver/src/indexed_constraint_system.rs
+++ b/constraint-solver/src/indexed_constraint_system.rs
@@ -341,9 +341,7 @@ fn variable_occurrences<T: RuntimeConstant, V: Hash + Eq + Clone>(
         });
     occurrences_in_algebraic_constraints
         .chain(occurrences_in_bus_interactions)
-        .into_group_map()
-        .into_iter()
-        .map(|(variable, occurrences)| (variable, occurrences.into_iter().collect::<BTreeSet<_>>()))
+        .into_grouping_map()
         .collect()
 }