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-rw-r--r--tests/ui/stdlib-unit-tests/not-sync.stderr2
1 files changed, 2 insertions, 0 deletions
diff --git a/tests/ui/stdlib-unit-tests/not-sync.stderr b/tests/ui/stdlib-unit-tests/not-sync.stderr
index 1ee358ba8..4e34e10e3 100644
--- a/tests/ui/stdlib-unit-tests/not-sync.stderr
+++ b/tests/ui/stdlib-unit-tests/not-sync.stderr
@@ -5,6 +5,7 @@ LL | test::<Cell<i32>>();
| ^^^^^^^^^ `Cell<i32>` cannot be shared between threads safely
|
= help: the trait `Sync` is not implemented for `Cell<i32>`
+ = note: if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock` or `std::sync::atomic::AtomicI32` instead
note: required by a bound in `test`
--> $DIR/not-sync.rs:5:12
|
@@ -18,6 +19,7 @@ LL | test::<RefCell<i32>>();
| ^^^^^^^^^^^^ `RefCell<i32>` cannot be shared between threads safely
|
= help: the trait `Sync` is not implemented for `RefCell<i32>`
+ = note: if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock` instead
note: required by a bound in `test`
--> $DIR/not-sync.rs:5:12
|