From 8c2413e00975f36a639e8f121a81fa236be0ab7d Mon Sep 17 00:00:00 2001
From: Alex Crichton <alex@alexcrichton.com>
Date: Mon, 24 May 2021 16:31:48 -0500
Subject: [PATCH] Try to ease up on CI usage slightly (#2932)

* First remove `fail-fast: false` annotations to fail faster. If desired
  this could always be added in a on-off fashion to PRs.
* Next use the new `concurrency` feature to try to cancel previous
  builds, ideally meaning that if a branch is pushed to multiple times
  it only runs CI once.
---
 .github/workflows/main.yml | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 6990aa6ec1..43d26b126f 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -9,6 +9,12 @@ defaults:
   run:
     shell: bash
 
+# Cancel any in-flight jobs for the same PR/branch so there's only one active
+# at a time
+concurrency:
+  group: ${{ github.head_ref }}
+  cancel-in-progress: true
+
 jobs:
   # Check Code style quickly by running `rustfmt` over all code
   rustfmt:
@@ -209,7 +215,6 @@ jobs:
     name: Test
     runs-on: ${{ matrix.os }}
     strategy:
-      fail-fast: false
       matrix:
         build: [stable, beta, nightly, windows, macos]
         include:
@@ -392,7 +397,6 @@ jobs:
     name: Build wasmtime
     runs-on: ${{ matrix.os }}
     strategy:
-      fail-fast: false
       matrix:
         include:
         - build: x86_64-linux