From bd928a0b5e144b0fafb2f4659a83aa362de7e3c7 Mon Sep 17 00:00:00 2001
From: Matthew Jasper <mjjasper1@gmail.com>
Date: Fri, 5 May 2023 12:54:58 +0100
Subject: Disallow (min) specialization imps with no items

Such implementations are usually mistakes and are not used in the
compiler or standard library (after this commit) so forbid them with
`min_specialization`.
---
 compiler/rustc_data_structures/src/owned_slice.rs | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'compiler/rustc_data_structures/src')

diff --git a/compiler/rustc_data_structures/src/owned_slice.rs b/compiler/rustc_data_structures/src/owned_slice.rs
index 048401f66c2..311a42aa42a 100644
--- a/compiler/rustc_data_structures/src/owned_slice.rs
+++ b/compiler/rustc_data_structures/src/owned_slice.rs
@@ -109,9 +109,11 @@ impl Borrow<[u8]> for OwnedSlice {
 }
 
 // Safety: `OwnedSlice` is conceptually `(&'self.1 [u8], Box<dyn Send + Sync>)`, which is `Send`
+#[cfg(parallel_compiler)]
 unsafe impl Send for OwnedSlice {}
 
 // Safety: `OwnedSlice` is conceptually `(&'self.1 [u8], Box<dyn Send + Sync>)`, which is `Sync`
+#[cfg(parallel_compiler)]
 unsafe impl Sync for OwnedSlice {}
 
 #[cfg(test)]
-- 
cgit 1.4.1-3-g733a5