X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=library%2Falloc%2Fsrc%2Flib.rs;h=76dabfb429dd503ab945ff002028f0a7f2d375dc;hb=dc3e59cb3fe05ebd752d3a2269f501c00327be22;hp=ca75c3895f41f61547be83491e0c042102a4a927;hpb=94a300b9b8eb253c1b809fc44b8c213fd591c537;p=rust.git

diff --git a/library/alloc/src/lib.rs b/library/alloc/src/lib.rs
index ca75c3895f4..76dabfb429d 100644
--- a/library/alloc/src/lib.rs
+++ b/library/alloc/src/lib.rs
@@ -87,6 +87,7 @@
 #![warn(missing_debug_implementations)]
 #![warn(missing_docs)]
 #![allow(explicit_outlives_requirements)]
+#![cfg_attr(not(bootstrap), warn(multiple_supertrait_upcastable))]
 //
 // Library features:
 #![feature(alloc_layout_extra)]
@@ -195,6 +196,7 @@
 #![feature(c_unwind)]
 #![feature(with_negative_coherence)]
 #![cfg_attr(test, feature(panic_update_hook))]
+#![cfg_attr(not(bootstrap), feature(multiple_supertrait_upcastable))]
 //
 // Rustdoc features:
 #![feature(doc_cfg)]