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-rw-r--r--src/test/ui/fmt/send-sync.rs10
1 files changed, 10 insertions, 0 deletions
diff --git a/src/test/ui/fmt/send-sync.rs b/src/test/ui/fmt/send-sync.rs
new file mode 100644
index 000000000..95ec68d1d
--- /dev/null
+++ b/src/test/ui/fmt/send-sync.rs
@@ -0,0 +1,10 @@
+fn send<T: Send>(_: T) {}
+fn sync<T: Sync>(_: T) {}
+
+fn main() {
+ // `Cell` is not `Sync`, so `&Cell` is neither `Sync` nor `Send`,
+ // `std::fmt::Arguments` used to forget this...
+ let c = std::cell::Cell::new(42);
+ send(format_args!("{:?}", c)); //~ ERROR E0277
+ sync(format_args!("{:?}", c)); //~ ERROR E0277
+}