From fed6dc019b10440e807777cef78ff2fe9ef7a1a2 Mon Sep 17 00:00:00 2001
From: John Carmack <johncarmack@me.com>
Date: Sat, 5 Sep 2026 15:02:17 -0700
Subject: [PATCH] ci: cancel superseded rust-ci runs on pull requests (#4555)

---
 .github/workflows/rust-ci.yaml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/.github/workflows/rust-ci.yaml b/.github/workflows/rust-ci.yaml
index 4885b51f4..857337e6d 100644
--- a/.github/workflows/rust-ci.yaml
+++ b/.github/workflows/rust-ci.yaml
@@ -7,6 +7,10 @@ on:
     branches: [ main ]
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
 defaults:
   run:
     working-directory: rustutils/