From 710ca6e38ecde09939c51a81752ae27d966ae974 Mon Sep 17 00:00:00 2001
From: Trevor Gross <tmgross@umich.edu>
Date: Sat, 26 Oct 2024 20:18:50 -0500
Subject: [PATCH] Add a rustfmt.toml file matching rust-lang/rust

Duplicate the settings from rust-lang/rust to this repository. This is
mostly for consistency, but `use_small_heuristics = "Max"` does make a
large difference with lookup tables.

Also apply the needed CI changes to run nightly rustfmt.
---
 library/compiler-builtins/libm/.github/workflows/main.yml | 2 +-
 library/compiler-builtins/libm/.rustfmt.toml              | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)
 create mode 100644 library/compiler-builtins/libm/.rustfmt.toml

diff --git a/library/compiler-builtins/libm/.github/workflows/main.yml b/library/compiler-builtins/libm/.github/workflows/main.yml
index 322043d85af3..f312e1f5e67c 100644
--- a/library/compiler-builtins/libm/.github/workflows/main.yml
+++ b/library/compiler-builtins/libm/.github/workflows/main.yml
@@ -41,7 +41,7 @@ jobs:
     steps:
     - uses: actions/checkout@master
     - name: Install Rust
-      run: rustup update stable && rustup default stable && rustup component add rustfmt
+      run: rustup update nightly && rustup default nightly && rustup component add rustfmt
     - run: cargo fmt -- --check
 
   wasm:
diff --git a/library/compiler-builtins/libm/.rustfmt.toml b/library/compiler-builtins/libm/.rustfmt.toml
new file mode 100644
index 000000000000..c73bb9301e34
--- /dev/null
+++ b/library/compiler-builtins/libm/.rustfmt.toml
@@ -0,0 +1,5 @@
+# This matches rustc
+style_edition = "2024"
+use_small_heuristics = "Max"
+group_imports = "StdExternalCrate"
+imports_granularity = "Module"