From 90dc0b02ae38185eee3e6490f7ff47b50297f22b Mon Sep 17 00:00:00 2001
From: Ben Kimock <kimockb@gmail.com>
Date: Fri, 22 Jul 2022 18:39:26 -0400
Subject: [PATCH] Lock stdout once when listing tests

---
 library/test/src/console.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/library/test/src/console.rs b/library/test/src/console.rs
index dc0123cf43266..e9dda98966de3 100644
--- a/library/test/src/console.rs
+++ b/library/test/src/console.rs
@@ -137,7 +137,7 @@ impl ConsoleTestState {
 // List the tests to console, and optionally to logfile. Filters are honored.
 pub fn list_tests_console(opts: &TestOpts, tests: Vec<TestDescAndFn>) -> io::Result<()> {
     let mut output = match term::stdout() {
-        None => OutputLocation::Raw(io::stdout()),
+        None => OutputLocation::Raw(io::stdout().lock()),
         Some(t) => OutputLocation::Pretty(t),
     };