From 5dad6c25751f577c53bd36d09f033e1c245d0806 Mon Sep 17 00:00:00 2001
From: Vadim Petrochenkov <vadim.petrochenkov@gmail.com>
Date: Sat, 6 Mar 2021 21:33:02 +0300
Subject: Implement built-in attribute macro `#[cfg_eval]`

---
 library/std/src/lib.rs        | 1 +
 library/std/src/prelude/v1.rs | 9 +++++++++
 2 files changed, 10 insertions(+)

(limited to 'library/std/src')

diff --git a/library/std/src/lib.rs b/library/std/src/lib.rs
index 72b86338d2c..acdf7550fe7 100644
--- a/library/std/src/lib.rs
+++ b/library/std/src/lib.rs
@@ -234,6 +234,7 @@
 #![feature(box_syntax)]
 #![feature(c_variadic)]
 #![feature(cfg_accessible)]
+#![cfg_attr(not(bootstrap), feature(cfg_eval))]
 #![feature(cfg_target_has_atomic)]
 #![feature(cfg_target_thread_local)]
 #![feature(char_error_internals)]
diff --git a/library/std/src/prelude/v1.rs b/library/std/src/prelude/v1.rs
index ef9aec54a4c..7181dc6e710 100644
--- a/library/std/src/prelude/v1.rs
+++ b/library/std/src/prelude/v1.rs
@@ -67,6 +67,15 @@ pub use core::prelude::v1::derive;
 #[doc(hidden)]
 pub use core::prelude::v1::cfg_accessible;
 
+#[cfg(not(bootstrap))]
+#[unstable(
+    feature = "cfg_eval",
+    issue = "82679",
+    reason = "`cfg_eval` is a recently implemented feature"
+)]
+#[doc(hidden)]
+pub use core::prelude::v1::cfg_eval;
+
 // The file so far is equivalent to src/libcore/prelude/v1.rs,
 // and below to src/liballoc/prelude.rs.
 // Those files are duplicated rather than using glob imports
-- 
cgit 1.4.1-3-g733a5