1 files changed, 65 insertions, 0 deletions
diff --git a/tests/ui/async-await/async-block-control-flow-static-semantics.rs b/tests/ui/async-await/async-block-control-flow-static-semantics.rs
new file mode 100644
index 000000000..bc9d12793
--- /dev/null
+++ b/tests/ui/async-await/async-block-control-flow-static-semantics.rs
@@ -0,0 +1,65 @@
+// Test that `async { .. }` blocks:
+// 1. do not allow `break` expressions.
+// 2. get targeted by `return` and not the parent function.
+// 3. get targeted by `?` and not the parent function.
+//
+// edition:2018
+
+fn main() {}
+
+use core::future::Future;
+
+fn return_targets_async_block_not_fn() -> u8 {
+    //~^ ERROR mismatched types
+    let block = async {
+        return 0u8;
+    };
+    let _: &dyn Future<Output = ()> = &block;
+    //~^ ERROR to be a future that resolves to `()`, but it resolves to `u8`
+}
+
+async fn return_targets_async_block_not_async_fn() -> u8 {
+    //~^ ERROR mismatched types [E0308]
+    let block = async {
+        return 0u8;
+    };
+    let _: &dyn Future<Output = ()> = &block;
+    //~^ ERROR to be a future that resolves to `()`, but it resolves to `u8`
+}
+
+fn no_break_in_async_block() {
+    async {
+        break 0u8; //~ ERROR `break` inside of an `async` block
+    };
+}
+
+fn no_break_in_async_block_even_with_outer_loop() {
+    loop {
+        async {
+            break 0u8; //~ ERROR `break` inside of an `async` block
+        };
+    }
+}
+
+struct MyErr;
+fn err() -> Result<u8, MyErr> {
+    Err(MyErr)
+}
+
+fn rethrow_targets_async_block_not_fn() -> Result<u8, MyErr> {
+    //~^ ERROR mismatched types
+    let block = async {
+        err()?;
+        Ok(())
+    };
+    let _: &dyn Future<Output = Result<(), MyErr>> = &block;
+}
+
+fn rethrow_targets_async_block_not_async_fn() -> Result<u8, MyErr> {
+    //~^ ERROR mismatched types
+    let block = async {
+        err()?;
+        Ok(())
+    };
+    let _: &dyn Future<Output = Result<(), MyErr>> = &block;
+}