stabilize derive(CoercePointee)

Author: dingxiangfei2009

library/core/src/marker.rs

@@ -1302,7 +1302,7 @@ pub trait FnPtr: Copy + Clone {
 #[rustc_builtin_macro(CoercePointee, attributes(pointee))]
 #[allow_internal_unstable(dispatch_from_dyn, coerce_unsized, unsize, coerce_pointee_validated)]
 #[cfg_attr(not(test), rustc_diagnostic_item = "CoercePointee")]
-#[unstable(feature = "derive_coerce_pointee", issue = "123430")]
+#[stable(feature = "derive_coerce_pointee", since = "CURRENT_RUSTC_VERSION")]
 pub macro CoercePointee($item:item) {
     /* compiler built-in */
 }

tests/ui/deriving/coerce-pointee-bounds-issue-127647.rs

@@ -1,7 +1,5 @@
 //@ check-pass
 
-#![feature(derive_coerce_pointee)]
-
 #[derive(core::marker::CoercePointee)]
 #[repr(transparent)]
 pub struct Ptr<'a, #[pointee] T: OnDrop + ?Sized, X> {

tests/ui/deriving/deriving-coerce-pointee-neg.rs

@@ -1,5 +1,5 @@
 //@ proc-macro: malicious-macro.rs
-#![feature(derive_coerce_pointee, arbitrary_self_types)]
+#![feature(arbitrary_self_types)]
 
 extern crate core;
 extern crate malicious_macro;

tests/ui/deriving/deriving-coerce-pointee.rs

@@ -1,5 +1,6 @@
 //@ run-pass
-#![feature(derive_coerce_pointee, arbitrary_self_types)]
+
+#![feature(arbitrary_self_types)]
 
 use std::marker::CoercePointee;