From 64bc26310010cec5e32418dbfcac4dc142a9f4ff Mon Sep 17 00:00:00 2001
From: KodrAus <kodraus@hey.com>
Date: Wed, 20 Apr 2022 18:03:25 +1000
Subject: [PATCH] stub out a contributing doc

---
 CONTRIBUTING.md | 9 +++++++++
 1 file changed, 9 insertions(+)
 create mode 100644 CONTRIBUTING.md

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 00000000..58833639
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,9 @@
+# Updating compile-fail test outputs
+
+`bitflags` uses the `trybuild` crate to integration test its macros. Since Rust error messages change frequently enough that `nightly` builds produce spurious failures, we only check the compiler output in `beta` builds. If you run:
+
+```
+TRYBUILD=overwrite cargo +beta test --all
+```
+
+it will run the tests and update the `trybuild` output files.