From db731e42b3c139587cd7a87acaa92cd82ab8a11c Mon Sep 17 00:00:00 2001
From: Mara Bos <m-ou.se@m-ou.se>
Date: Tue, 24 Jan 2023 16:44:00 +0100
Subject: [PATCH] Work around issue 106930.

---
 compiler/rustc_ast/src/format.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/compiler/rustc_ast/src/format.rs b/compiler/rustc_ast/src/format.rs
index ce99c2b58b5..da05b09b37d 100644
--- a/compiler/rustc_ast/src/format.rs
+++ b/compiler/rustc_ast/src/format.rs
@@ -67,6 +67,12 @@ pub struct FormatArguments {
     names: FxHashMap<Symbol, usize>,
 }
 
+// FIXME: Rustdoc has trouble proving Send/Sync for this. See #106930.
+#[cfg(parallel_compiler)]
+unsafe impl Sync for FormatArguments {}
+#[cfg(parallel_compiler)]
+unsafe impl Send for FormatArguments {}
+
 impl FormatArguments {
     pub fn new() -> Self {
         Self {