Fix UI test

fmt::Formatter is still not Send/Sync, but the UI test emitted two errors, for
the dyn Write and the Void inside Formatter. As of this PR, the Void is now
gone, but the dyn Write remains.

2 files changed, 8 insertions, 31 deletions

diff --git a/src/test/ui/async-await/async-fn-nonsend.rs b/src/test/ui/async-await/async-fn-nonsend.rs
index 645c903c6ba..ceeebbca519 100644
--- a/src/test/ui/async-await/async-fn-nonsend.rs
+++ b/src/test/ui/async-await/async-fn-nonsend.rs
@@ -2,15 +2,15 @@
 // edition:2018
 // compile-flags: --crate-type lib
 
-use std::{
-    cell::RefCell,
-    fmt::Debug,
-    rc::Rc,
-};
+use std::{cell::RefCell, fmt::Debug, rc::Rc};
 
-fn non_sync() -> impl Debug { RefCell::new(()) }
+fn non_sync() -> impl Debug {
+    RefCell::new(())
+}
 
-fn non_send() -> impl Debug { Rc::new(()) }
+fn non_send() -> impl Debug {
+    Rc::new(())
+}
 
 fn take_ref<T>(_: &T) {}
 
@@ -53,5 +53,4 @@ pub fn pass_assert() {
     //~^ ERROR future cannot be sent between threads safely
     assert_send(non_sync_with_method_call());
     //~^ ERROR future cannot be sent between threads safely
-    //~^^ ERROR future cannot be sent between threads safely
 }
diff --git a/src/test/ui/async-await/async-fn-nonsend.stderr b/src/test/ui/async-await/async-fn-nonsend.stderr
index 5c870ca2d02..105fd23ecfb 100644
--- a/src/test/ui/async-await/async-fn-nonsend.stderr
+++ b/src/test/ui/async-await/async-fn-nonsend.stderr
@@ -62,27 +62,5 @@ LL |     }
 LL | }
    | - `f` is later dropped here
 
-error: future cannot be sent between threads safely
-  --> $DIR/async-fn-nonsend.rs:54:5
-   |
-LL | fn assert_send(_: impl Send) {}
-   |    -----------         ---- required by this bound in `assert_send`
-...
-LL |     assert_send(non_sync_with_method_call());
-   |     ^^^^^^^^^^^ future returned by `non_sync_with_method_call` is not `Send`
-   |
-   = help: within `std::fmt::ArgumentV1<'_>`, the trait `std::marker::Sync` is not implemented for `*mut (dyn std::ops::Fn() + 'static)`
-note: future is not `Send` as this value is used across an await
-  --> $DIR/async-fn-nonsend.rs:43:9
-   |
-LL |     let f: &mut std::fmt::Formatter = panic!();
-   |         - has type `&mut std::fmt::Formatter<'_>`
-LL |     if non_sync().fmt(f).unwrap() == () {
-LL |         fut().await;
-   |         ^^^^^^^^^^^ await occurs here, with `f` maybe used later
-LL |     }
-LL | }
-   | - `f` is later dropped here
-
-error: aborting due to 4 previous errors
+error: aborting due to 3 previous errors