Point out that std's SyncUnsafeCell is more complete

ehuss · ehuss · commit 4cf15eaa29a7 · 2025-01-13T15:40:06.000-08:00
diff --git a/src/rust-2024/static-mut-references.md b/src/rust-2024/static-mut-references.md
@@ -330,7 +330,7 @@ fn set_value(value: i32) {
 }
 ```
 
-The standard library has a nightly-only (unstable) variant of [`UnsafeCell`] called [`SyncUnsafeCell`]. This example above shows a very simplified version of the standard library type, but would be used roughly the same way.
+The standard library has a nightly-only (unstable) variant of [`UnsafeCell`] called [`SyncUnsafeCell`]. This example above shows a very simplified version of the standard library type, but would be used roughly the same way. It can provide even better isolation, so do check out its implementation for more details.
 
 [`UnsafeCell`]: ../../std/cell/struct.UnsafeCell.html
 [`SyncUnsafeCell`]: ../../std/cell/struct.SyncUnsafeCell.html

Original file line number	Diff line number	Diff line change
`@@ -330,7 +330,7 @@ fn set_value(value: i32) {`
`330`	`330`	`}`
`331`	`331`	```
`332`	`332`
`333`		-The standard library has a nightly-only (unstable) variant of [`UnsafeCell`] called [`SyncUnsafeCell`]. This example above shows a very simplified version of the standard library type, but would be used roughly the same way.
	`333`	+The standard library has a nightly-only (unstable) variant of [`UnsafeCell`] called [`SyncUnsafeCell`]. This example above shows a very simplified version of the standard library type, but would be used roughly the same way. It can provide even better isolation, so do check out its implementation for more details.
`334`	`334`
`335`	`335`	[`UnsafeCell`]: ../../std/cell/struct.UnsafeCell.html
`336`	`336`	[`SyncUnsafeCell`]: ../../std/cell/struct.SyncUnsafeCell.html