Update tests

Author: Aaron1011

src/test/ui/async-await/async-fn-nonsend.rs

@@ -2,6 +2,8 @@
 // edition:2018
 // compile-flags: --crate-type lib
 
+#![feature(generator_mir_traits)]
+
 use std::{
     cell::RefCell,
     fmt::Debug,

src/test/ui/async-await/async-fn-nonsend.stderr

@@ -1,5 +1,5 @@
 error[E0277]: `std::rc::Rc<()>` cannot be sent between threads safely
-  --> $DIR/async-fn-nonsend.rs:50:5
+  --> $DIR/async-fn-nonsend.rs:52:5
    |
 LL | fn assert_send(_: impl Send) {}
    |    -----------         ---- required by this bound in `assert_send`
@@ -11,8 +11,8 @@ LL |     assert_send(non_send_temporary_in_match());
    = note: required because it appears within the type `impl std::fmt::Debug`
    = note: required because it appears within the type `std::option::Option<impl std::fmt::Debug>`
    = note: required because it appears within the type `[witness@DefId(0:25 ~ async_fn_nonsend[8787]::non_send_temporary_in_match[0]::{{closure}}[0]){impl std::fmt::Debug, std::option::Option<impl std::fmt::Debug>, impl std::future::Future, impl std::future::Future, ()}]`
-   = note: required because it appears within the type `[static generator@$DIR/async-fn-nonsend.rs:28:40: 37:2 [witness@DefId(0:25 ~ async_fn_nonsend[8787]::non_send_temporary_in_match[0]::{{closure}}[0]){impl std::fmt::Debug, std::option::Option<impl std::fmt::Debug>, impl std::future::Future, impl std::future::Future, ()}]]`
-   = note: required because it appears within the type `std::future::GenFuture<[static generator@$DIR/async-fn-nonsend.rs:28:40: 37:2 [witness@DefId(0:25 ~ async_fn_nonsend[8787]::non_send_temporary_in_match[0]::{{closure}}[0]){impl std::fmt::Debug, std::option::Option<impl std::fmt::Debug>, impl std::future::Future, impl std::future::Future, ()}]]>`
+   = note: required because it appears within the type `[static generator@$DIR/async-fn-nonsend.rs:30:40: 39:2 [witness@DefId(0:25 ~ async_fn_nonsend[8787]::non_send_temporary_in_match[0]::{{closure}}[0]){impl std::fmt::Debug, std::option::Option<impl std::fmt::Debug>, impl std::future::Future, impl std::future::Future, ()}]]`
+   = note: required because it appears within the type `std::future::GenFuture<[static generator@$DIR/async-fn-nonsend.rs:30:40: 39:2 [witness@DefId(0:25 ~ async_fn_nonsend[8787]::non_send_temporary_in_match[0]::{{closure}}[0]){impl std::fmt::Debug, std::option::Option<impl std::fmt::Debug>, impl std::future::Future, impl std::future::Future, ()}]]>`
    = note: required because it appears within the type `impl std::future::Future`
    = note: required because it appears within the type `impl std::future::Future`
 

src/test/ui/feature-gate/feature-gate-generator_mir_traits.rs

@@ -0,0 +1,16 @@
+// compile-fail
+// edition:2018
+
+fn is_send<T: Send>(val: T) {}
+
+async fn dummy() {}
+
+async fn not_send() {
+    let val: *const ();
+    dummy().await;
+}
+
+fn main() {
+    is_send(not_send());
+    //~^ ERROR  `*const ()` cannot be sent between threads safely
+}

src/test/ui/feature-gate/feature-gate-generator_mir_traits.stderr

@@ -0,0 +1,23 @@
+error[E0277]: `*const ()` cannot be sent between threads safely
+  --> $DIR/feature-gate-generator_mir_traits.rs:14:5
+   |
+LL | fn is_send<T: Send>(val: T) {}
+   |    -------    ---- required by this bound in `is_send`
+...
+LL |     is_send(not_send());
+   |     ^^^^^^^ `*const ()` cannot be sent between threads safely
+   |
+   = help: within `impl std::future::Future`, the trait `std::marker::Send` is not implemented for `*const ()`
+note: future does not implement `std::marker::Send` as this value is used across an await
+  --> $DIR/feature-gate-generator_mir_traits.rs:10:5
+   |
+LL |     let val: *const ();
+   |         --- has type `*const ()`
+LL |     dummy().await;
+   |     ^^^^^^^^^^^^^ await occurs here, with `val` maybe used later
+LL | }
+   | - `val` is later dropped here
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0277`.