1 files changed, 49 insertions, 0 deletions
diff --git a/src/test/ui/async-await/async-fn-nonsend.stderr b/src/test/ui/async-await/async-fn-nonsend.stderr
new file mode 100644
index 000000000..40ad46b48
--- /dev/null
+++ b/src/test/ui/async-await/async-fn-nonsend.stderr
@@ -0,0 +1,49 @@
+error: future cannot be sent between threads safely
+  --> $DIR/async-fn-nonsend.rs:68:17
+   |
+LL |     assert_send(non_send_temporary_in_match());
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ future returned by `non_send_temporary_in_match` is not `Send`
+   |
+   = help: within `impl Future<Output = ()>`, the trait `Send` is not implemented for `Rc<()>`
+note: future is not `Send` as this value is used across an await
+  --> $DIR/async-fn-nonsend.rs:33:25
+   |
+LL |     match Some(non_send()) {
+   |           ---------------- has type `Option<impl Debug>` which is not `Send`
+LL |         Some(_) => fut().await,
+   |                         ^^^^^^ await occurs here, with `Some(non_send())` maybe used later
+...
+LL | }
+   | - `Some(non_send())` is later dropped here
+note: required by a bound in `assert_send`
+  --> $DIR/async-fn-nonsend.rs:64:24
+   |
+LL | fn assert_send(_: impl Send) {}
+   |                        ^^^^ required by this bound in `assert_send`
+
+error: future cannot be sent between threads safely
+  --> $DIR/async-fn-nonsend.rs:70:17
+   |
+LL |     assert_send(non_sync_with_method_call());
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^ future returned by `non_sync_with_method_call` is not `Send`
+   |
+   = help: the trait `Send` is not implemented for `dyn std::fmt::Write`
+note: future is not `Send` as this value is used across an await
+  --> $DIR/async-fn-nonsend.rs:46:14
+   |
+LL |     let f: &mut std::fmt::Formatter = &mut get_formatter();
+   |                                            --------------- has type `Formatter<'_>` which is not `Send`
+...
+LL |         fut().await;
+   |              ^^^^^^ await occurs here, with `get_formatter()` maybe used later
+LL |     }
+LL | }
+   | - `get_formatter()` is later dropped here
+note: required by a bound in `assert_send`
+  --> $DIR/async-fn-nonsend.rs:64:24
+   |
+LL | fn assert_send(_: impl Send) {}
+   |                        ^^^^ required by this bound in `assert_send`
+
+error: aborting due to 2 previous errors
+