try fix

Author: ZuseZ4

library/core/src/macros/mod.rs

@@ -1513,8 +1513,8 @@ pub(crate) mod builtin {
     ///
     /// ### Usage examples:
     ///
-    #[cfg_attr(feature = "llvm_enzyme", doc = " ```rust")]
-    #[cfg_attr(not(feature = "llvm_enzyme"), doc = " ```rust,compile_fail")]
+    /// ```rust,ignore
+    /// #![feature(autodiff)]
     /// use std::autodiff::*;
     /// #[autodiff_forward(rb_fwd1, Dual, Const, Dual)]
     /// #[autodiff_forward(rb_fwd2, Const, Dual, Dual)]
@@ -1586,8 +1586,8 @@ pub(crate) mod builtin {
     ///
     /// ### Usage examples:
     ///
-    #[cfg_attr(feature = "llvm_enzyme", doc = " ```rust")]
-    #[cfg_attr(not(feature = "llvm_enzyme"), doc = " ```rust,compile_fail")]
+    /// ```rust,ignore
+    /// #![feature(autodiff)]
     /// use std::autodiff::*;
     /// #[autodiff_reverse(rb_rev, Active, Active, Active)]
     /// fn rosenbrock(x: f64, y: f64) -> f64 {