Update static AFIT tests based on feedback

Author: bryangarza

src/test/ui/async-await/in-trait/async-associated-types.rs

@@ -6,7 +6,7 @@
 use std::fmt::Debug;
 
 trait MyTrait<'a, 'b, T> where Self: 'a, T: Debug + Sized + 'b {
-    type MyAssoc;// = (&'a T, &'b U);
+    type MyAssoc;
 
     async fn foo(&'a self, key: &'b T) -> Self::MyAssoc;
 }

src/test/ui/async-await/in-trait/async-associated-types2-desugared.rs

@@ -1,6 +1,8 @@
+// check-pass
 // edition: 2021
 
 #![feature(async_fn_in_trait)]
+#![feature(type_alias_impl_trait)]
 #![allow(incomplete_features)]
 
 use std::future::Future;
@@ -10,19 +12,15 @@ trait MyTrait {
     where
         Self: 'a;
 
-    fn foo(&self) -> Self::Fut<'a>;
-    //~^ ERROR use of undeclared lifetime name `'a`
+    fn foo<'a>(&'a self) -> Self::Fut<'a>;
 }
 
 impl MyTrait for i32 {
-    type Fut<'a> = impl Future + 'a
+    type Fut<'a> = impl Future<Output = i32> + 'a
     where
         Self: 'a;
-    //~^^^ ERROR `impl Trait` in type aliases is unstable
-    //~| ERROR expected `<i32 as MyTrait>::Fut<'a>` to be a future that resolves to `i32`, but it resolves to `<<i32 as MyTrait>::Fut<'a> as Future>::Output`
 
     fn foo<'a>(&'a self) -> Self::Fut<'a> {
-        //~^ ERROR `impl` item signature doesn't match `trait` item signature
         async {
             *self
         }

src/test/ui/async-await/in-trait/async-associated-types2-desugared.stderr

@@ -0,0 +1,22 @@
+// check-pass
+// edition: 2021
+
+#![feature(async_fn_in_trait)]
+#![feature(return_position_impl_trait_in_trait)]
+#![allow(incomplete_features)]
+
+use std::future::Future;
+
+trait MyTrait {
+    async fn foo(&self) -> i32;
+}
+
+impl MyTrait for i32 {
+    fn foo(&self) -> impl Future<Output = i32> + '_ {
+        async {
+            *self
+        }
+    }
+}
+
+fn main() {}

src/test/ui/async-await/in-trait/async-associated-types2.rs

@@ -8,7 +8,7 @@ use std::future::Future;
 trait MyTrait {
     async fn foo(&self) -> i32;
 }
-    
+
 impl MyTrait for i32 {
     fn foo(&self) -> impl Future<Output = i32> {
         //~^ ERROR `impl Trait` only allowed in function and inherent method return types, not in `impl` method return [E0562]