remove autodiff from prelude

Author: ZuseZ4

library/core/src/prelude/common.rs

@@ -79,12 +79,6 @@ pub use crate::macros::builtin::{
 #[unstable(feature = "derive_const", issue = "none")]
 pub use crate::macros::builtin::derive_const;
 
-
-#[cfg(not(bootstrap))]
-#[unstable(feature = "autodiff", issue = "none")]
-#[rustc_builtin_macro]
-pub use crate::macros::builtin::autodiff;
-
 #[unstable(
     feature = "cfg_accessible",
     issue = "64797",

library/std/src/prelude/common.rs

@@ -66,11 +66,6 @@ pub use core::prelude::v1::{
 #[unstable(feature = "derive_const", issue = "none")]
 pub use core::prelude::v1::derive_const;
 
-#[unstable(feature = "autodiff", issue = "none")]
-#[cfg(not(bootstrap))]
-#[rustc_builtin_macro]
-pub use core::prelude::v1::autodiff;
-
 // Do not `doc(no_inline)` either.
 #[unstable(
     feature = "cfg_accessible",