From 287c4eb0947c5b2df63633fc71005f2bab541673 Mon Sep 17 00:00:00 2001
From: Eric Huss <eric@huss.org>
Date: Wed, 18 Mar 2020 08:15:29 -0700
Subject: [PATCH] Tidy: fix running rustfmt twice

---
 src/bootstrap/format.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/bootstrap/format.rs b/src/bootstrap/format.rs
index a4acb14ee4b14..1616ae15d31d6 100644
--- a/src/bootstrap/format.rs
+++ b/src/bootstrap/format.rs
@@ -37,6 +37,9 @@ struct RustfmtConfig {
 }
 
 pub fn format(build: &Build, check: bool) {
+    if build.config.dry_run {
+        return;
+    }
     let mut builder = ignore::types::TypesBuilder::new();
     builder.add_defaults();
     builder.select("rust");