1 files changed, 16 insertions, 5 deletions
diff --git a/src/lib.rs b/src/lib.rs
index 54f67895a6..42471d178e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -150,22 +150,33 @@
     )
 )]
 // Attributes needed when building as part of the standard library
-#![cfg_attr(feature = "stdbuild", feature(staged_api, cfg_target_vendor))]
-#![cfg_attr(feature = "stdbuild", feature(link_cfg, repr_packed))]
-#![cfg_attr(feature = "stdbuild", allow(warnings))]
+#![cfg_attr(feature = "rustc-dep-of-std", feature(staged_api, cfg_target_vendor))]
+#![cfg_attr(feature = "rustc-dep-of-std", feature(link_cfg, repr_packed))]
+#![cfg_attr(feature = "rustc-dep-of-std", feature(no_core))]
+#![cfg_attr(feature = "rustc-dep-of-std", no_core)]
+#![cfg_attr(feature = "rustc-dep-of-std", allow(warnings))]
 #![cfg_attr(
-    feature = "stdbuild",
+    feature = "rustc-dep-of-std",
     unstable(
         feature = "libc",
         reason = "use `libc` from crates.io",
         issue = "27783"
     )
 )]
-#![cfg_attr(not(feature = "use_std"), no_std)]
+#![cfg_attr(not(any(feature = "use_std", feature = "rustc-dep-of-std")), no_std)]
 
 #[cfg(all(not(cross_platform_docs), feature = "use_std"))]
 extern crate std as core;
 
+#[cfg(feature = "rustc-dep-of-std")]
+extern crate rustc_std_workspace_core as core;
+#[cfg(feature = "rustc-dep-of-std")]
+#[allow(unused_imports)]
+use core::iter;
+#[cfg(feature = "rustc-dep-of-std")]
+#[allow(unused_imports)]
+use core::option;
+
 #[macro_use]
 mod macros;