From 1e8ec2db1d3d695958a8040fbb3491a4378ef7ae Mon Sep 17 00:00:00 2001
From: Nicholas Nethercote <nnethercote@mozilla.com>
Date: Tue, 7 Jul 2020 13:10:19 +1000
Subject: [PATCH] Add an explanatory comment to `scoped_thread`.

---
 src/librustc_interface/util.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/librustc_interface/util.rs b/src/librustc_interface/util.rs
index fe091e92062..438b72b0b61 100644
--- a/src/librustc_interface/util.rs
+++ b/src/librustc_interface/util.rs
@@ -102,6 +102,8 @@ impl Write for Sink {
     }
 }
 
+/// Like a `thread::Builder::spawn` followed by a `join()`, but avoids the need
+/// for `'static` bounds.
 #[cfg(not(parallel_compiler))]
 pub fn scoped_thread<F: FnOnce() -> R + Send, R: Send>(cfg: thread::Builder, f: F) -> R {
     struct Ptr(*mut ());