Prevent errors for stage0 rustc build

fee1-dead · fee1-dead · commit bc6483d11e69 · 2022-09-16T11:48:42.000+08:00
diff --git a/library/core/src/default.rs b/library/core/src/default.rs
@@ -99,7 +99,7 @@
 /// ```
 #[cfg_attr(not(test), rustc_diagnostic_item = "Default")]
 #[stable(feature = "rust1", since = "1.0.0")]
-#[const_trait]
+#[cfg_attr(not(bootstrap), const_trait)]
 pub trait Default: Sized {
     /// Returns the "default value" for a type.
     ///
