Fix ICE 89775

Author: nbdd0121

core/src/marker.rs

@@ -30,7 +30,8 @@ use crate::hash::Hasher;
 /// [arc]: ../../std/sync/struct.Arc.html
 /// [ub]: ../../reference/behavior-considered-undefined.html
 #[stable(feature = "rust1", since = "1.0.0")]
-#[cfg_attr(not(test), rustc_diagnostic_item = "Send")]
+#[cfg_attr(all(not(test), bootstrap), rustc_diagnostic_item = "send_trait")]
+#[cfg_attr(all(not(test), not(bootstrap)), rustc_diagnostic_item = "Send")]
 #[rustc_on_unimplemented(
     message = "`{Self}` cannot be sent between threads safely",
     label = "`{Self}` cannot be sent between threads safely"