From e3cef1df54cc358508145473f5254ebd05b229bd Mon Sep 17 00:00:00 2001
From: xtqqczze <45661989+xtqqczze@users.noreply.github.com>
Date: Wed, 15 Apr 2026 23:45:50 +0100
Subject: [PATCH 1/2] clippy: fix collapsible_match lint

https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_match
---
 src/groupbylazy.rs | 26 +++++++++++---------------
 1 file changed, 11 insertions(+), 15 deletions(-)

diff --git a/src/groupbylazy.rs b/src/groupbylazy.rs
index af7512343..5f310f43e 100644
--- a/src/groupbylazy.rs
+++ b/src/groupbylazy.rs
@@ -198,14 +198,12 @@ where
         while let Some(elt) = self.next_element() {
             let key = self.key.call_mut(&elt);
             match self.current_key.take() {
-                None => {}
-                Some(old_key) => {
-                    if old_key != key {
-                        self.current_key = Some(key);
-                        first_elt = Some(elt);
-                        break;
-                    }
+                Some(old_key) if old_key != key => {
+                    self.current_key = Some(key);
+                    first_elt = Some(elt);
+                    break;
                 }
+                _ => {}
             }
             self.current_key = Some(key);
             if self.top_group != self.dropped_group {
@@ -249,15 +247,13 @@ where
             Some(elt) => {
                 let key = self.key.call_mut(&elt);
                 match self.current_key.take() {
-                    None => {}
-                    Some(old_key) => {
-                        if old_key != key {
-                            self.current_key = Some(key);
-                            self.current_elt = Some(elt);
-                            self.top_group += 1;
-                            return None;
-                        }
+                    Some(old_key) if old_key != key => {
+                        self.current_key = Some(key);
+                        self.current_elt = Some(elt);
+                        self.top_group += 1;
+                        return None;
                     }
+                    _ => {}
                 }
                 self.current_key = Some(key);
                 Some(elt)

From 348e1baf4ff2917739348be3835797831a0c0136 Mon Sep 17 00:00:00 2001
From: xtqqczze <45661989+xtqqczze@users.noreply.github.com>
Date: Thu, 16 Apr 2026 12:37:08 +0100
Subject: [PATCH 2/2] refactor: replace match with a single if let guard

---
 src/groupbylazy.rs | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/src/groupbylazy.rs b/src/groupbylazy.rs
index 5f310f43e..f2f717fb9 100644
--- a/src/groupbylazy.rs
+++ b/src/groupbylazy.rs
@@ -197,13 +197,12 @@ where
 
         while let Some(elt) = self.next_element() {
             let key = self.key.call_mut(&elt);
-            match self.current_key.take() {
-                Some(old_key) if old_key != key => {
+            if let Some(old_key) = self.current_key.take() {
+                if old_key != key {
                     self.current_key = Some(key);
                     first_elt = Some(elt);
                     break;
                 }
-                _ => {}
             }
             self.current_key = Some(key);
             if self.top_group != self.dropped_group {
@@ -246,14 +245,13 @@ where
             None => None,
             Some(elt) => {
                 let key = self.key.call_mut(&elt);
-                match self.current_key.take() {
-                    Some(old_key) if old_key != key => {
+                if let Some(old_key) = self.current_key.take() {
+                    if old_key != key {
                         self.current_key = Some(key);
                         self.current_elt = Some(elt);
                         self.top_group += 1;
                         return None;
                     }
-                    _ => {}
                 }
                 self.current_key = Some(key);
                 Some(elt)