From d47a89e23e4089037205b2aaa1b7542f0abad6f0 Mon Sep 17 00:00:00 2001
From: Alex Dewar <a.dewar@imperial.ac.uk>
Date: Mon, 14 Apr 2025 15:58:24 +0100
Subject: [PATCH] read_csv_id_file: Remove unnecessary `contains_key`

---
 src/input.rs | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/input.rs b/src/input.rs
index 7020b4a95..691c79ebd 100644
--- a/src/input.rs
+++ b/src/input.rs
@@ -152,11 +152,9 @@ where
     {
         let mut map = IndexMap::new();
         for record in read_csv::<T>(file_path)? {
-            let id = record.get_id();
-
-            ensure!(!map.contains_key(id), "Duplicate ID found: {id}");
-
-            map.insert(id.into(), record);
+            let id = record.get_id().into();
+            let existing = map.insert(Rc::clone(&id), record).is_some();
+            ensure!(!existing, "Duplicate ID found: {id}");
         }
         ensure!(!map.is_empty(), "CSV file is empty");