Implement changes from T-Libs-API review

And start tracking based on the tracking issue.

Author: yoshuawuyts

library/core/src/mem/drop_guard.rs

@@ -27,10 +27,10 @@ use crate::ops::{Deref, DerefMut};
 ///     // "Chashu likes tuna!!!"
 /// }
 /// ```
-#[unstable(feature = "drop_guard", issue = "none")]
+#[unstable(feature = "drop_guard", issue = "144426")]
 #[doc(alias = "ScopeGuard")]
 #[doc(alias = "defer")]
-pub struct DropGuard<T, F = fn(T)>
+pub struct DropGuard<T, F>
 where
     F: FnOnce(T),
 {
@@ -55,7 +55,7 @@ where
     /// let value = String::from("Chashu likes tuna");
     /// let guard = DropGuard::new(value, |s| println!("{s}"));
     /// ```
-    #[unstable(feature = "drop_guard", issue = "none")]
+    #[unstable(feature = "drop_guard", issue = "144426")]
     #[must_use]
     pub const fn new(inner: T, f: F) -> Self {
         Self { inner: ManuallyDrop::new(inner), f: ManuallyDrop::new(f) }
@@ -83,7 +83,7 @@ where
     /// let guard = DropGuard::new(value, |s| println!("{s}"));
     /// assert_eq!(DropGuard::into_inner(guard), "Nori likes chicken");
     /// ```
-    #[unstable(feature = "drop_guard", issue = "none")]
+    #[unstable(feature = "drop_guard", issue = "144426")]
     #[inline]
     pub fn into_inner(guard: Self) -> T {
         // First we ensure that dropping the guard will not trigger
@@ -105,7 +105,7 @@ where
     }
 }
 
-#[unstable(feature = "drop_guard", issue = "none")]
+#[unstable(feature = "drop_guard", issue = "144426")]
 impl<T, F> Deref for DropGuard<T, F>
 where
     F: FnOnce(T),
@@ -117,7 +117,7 @@ where
     }
 }
 
-#[unstable(feature = "drop_guard", issue = "none")]
+#[unstable(feature = "drop_guard", issue = "144426")]
 impl<T, F> DerefMut for DropGuard<T, F>
 where
     F: FnOnce(T),
@@ -127,7 +127,7 @@ where
     }
 }
 
-#[unstable(feature = "drop_guard", issue = "none")]
+#[unstable(feature = "drop_guard", issue = "144426")]
 impl<T, F> Drop for DropGuard<T, F>
 where
     F: FnOnce(T),
@@ -143,7 +143,7 @@ where
     }
 }
 
-#[unstable(feature = "drop_guard", issue = "none")]
+#[unstable(feature = "drop_guard", issue = "144426")]
 impl<T, F> Debug for DropGuard<T, F>
 where
     T: Debug,