Add tracking issue

Author: jonas-schievink

compiler/rustc_feature/src/active.rs

@@ -651,7 +651,7 @@ declare_features! (
     (active, const_fn_unsize, "1.53.0", Some(64992), None),
 
     /// Allows `async {}` expressions in const contexts.
-    (active, const_async_blocks, "1.53.0", None, None),
+    (active, const_async_blocks, "1.53.0", Some(85368), None),
 
     /// Allows using imported `main` function
     (active, imported_main, "1.53.0", Some(28937), None),

src/test/ui/consts/async-block.without_feature.stderr

@@ -4,6 +4,7 @@ error[E0658]: `async` blocks are not allowed in constants
 LL | const _: i32 = { core::mem::ManuallyDrop::new(async { 0 }); 4 };
    |                                               ^^^^^^^^^^^
    |
+   = note: see issue #85368 <https://github.com/rust-lang/rust/issues/85368> for more information
    = help: add `#![feature(const_async_blocks)]` to the crate attributes to enable
 
 error[E0658]: `async` blocks are not allowed in statics
@@ -12,6 +13,7 @@ error[E0658]: `async` blocks are not allowed in statics
 LL | static _FUT: &(dyn Future<Output = ()> + Sync) = &async {};
    |                                                   ^^^^^^^^
    |
+   = note: see issue #85368 <https://github.com/rust-lang/rust/issues/85368> for more information
    = help: add `#![feature(const_async_blocks)]` to the crate attributes to enable
 
 error: aborting due to 2 previous errors

src/test/ui/impl-trait/issues/issue-78721.stderr

@@ -13,6 +13,7 @@ error[E0658]: `async` blocks are not allowed in constants
 LL |         let f: impl core::future::Future<Output = u8> = async { 1 };
    |                                                         ^^^^^^^^^^^
    |
+   = note: see issue #85368 <https://github.com/rust-lang/rust/issues/85368> for more information
    = help: add `#![feature(const_async_blocks)]` to the crate attributes to enable
 
 error[E0493]: destructors cannot be evaluated at compile-time

src/test/ui/impl-trait/issues/issue-78722.full_tait.stderr

@@ -21,6 +21,7 @@ error[E0658]: `async` blocks are not allowed in constants
 LL |         let f: F = async { 1 };
    |                    ^^^^^^^^^^^
    |
+   = note: see issue #85368 <https://github.com/rust-lang/rust/issues/85368> for more information
    = help: add `#![feature(const_async_blocks)]` to the crate attributes to enable
 
 error[E0493]: destructors cannot be evaluated at compile-time

src/test/ui/impl-trait/issues/issue-78722.min_tait.stderr

@@ -13,6 +13,7 @@ error[E0658]: `async` blocks are not allowed in constants
 LL |         let f: F = async { 1 };
    |                    ^^^^^^^^^^^
    |
+   = note: see issue #85368 <https://github.com/rust-lang/rust/issues/85368> for more information
    = help: add `#![feature(const_async_blocks)]` to the crate attributes to enable
 
 error[E0493]: destructors cannot be evaluated at compile-time