Arbitrary self types v2: stabilize in miri

Author: adetaylor

Diff for: src/tools/miri/src/lib.rs

@@ -14,7 +14,7 @@
 #![feature(pointer_is_aligned_to)]
 #![feature(unqualified_local_imports)]
 #![feature(derive_coerce_pointee)]
-#![feature(arbitrary_self_types)]
+#![cfg_attr(bootstrap,feature(legacy_receiver_trait))]
 // Configure clippy and other lints
 #![allow(
     clippy::collapsible_else_if,

Diff for: src/tools/miri/src/shims/files.rs

@@ -43,6 +43,10 @@ impl<T: ?Sized> Deref for FileDescriptionRef<T> {
     }
 }
 
+#[cfg(bootstrap)]
+impl<T: ?Sized> core::ops::LegacyReceiver for FileDescriptionRef<T> {
+}
+
 impl<T: ?Sized> FileDescriptionRef<T> {
     pub fn id(&self) -> FdId {
         self.0.id