Add some tests

1 files changed, 19 insertions, 0 deletions

diff --git a/tests/ui/async-await/async-closures/mutate.rs b/tests/ui/async-await/async-closures/mutate.rs
new file mode 100644
index 00000000000..cc1df5f034f
--- /dev/null
+++ b/tests/ui/async-await/async-closures/mutate.rs
@@ -0,0 +1,19 @@
+// aux-build:block-on.rs
+// edition:2021
+// run-pass
+
+#![feature(async_closure)]
+
+extern crate block_on;
+
+fn main() {
+    block_on::block_on(async {
+        let mut prefix = String::from("Hello");
+        let mut c = async move |x: &str| {
+            prefix.push(',');
+            println!("{prefix} {x}!")
+        };
+        c("world").await;
+        c("rust").await;
+    });
+}