Reexport for bootstrap

Author: Darksonn

library/core/src/marker.rs

@@ -1131,3 +1131,6 @@ pub trait FnPtr: Copy + Clone {
     #[lang = "fn_ptr_addr"]
     fn addr(self) -> *const ();
 }
+
+#[unstable(feature = "derive_coerce_pointee", issue = "123430")]
+pub use crate::ops::CoercePointee;

src/tools/miri/src/shims/files.rs

@@ -2,7 +2,7 @@ use std::any::Any;
 use std::collections::BTreeMap;
 use std::fs::{File, Metadata};
 use std::io::{ErrorKind, IsTerminal, Seek, SeekFrom, Write};
-use std::ops::CoercePointee;
+use std::marker::CoercePointee;
 use std::ops::Deref;
 use std::rc::{Rc, Weak};
 use std::{fs, io};