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-rw-r--r--src/liballoc/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/liballoc/lib.rs b/src/liballoc/lib.rs
index d55a1a3b635..5857b79d5ee 100644
--- a/src/liballoc/lib.rs
+++ b/src/liballoc/lib.rs
@@ -99,6 +99,7 @@
 #![feature(internal_uninit_const)]
 #![feature(lang_items)]
 #![feature(libc)]
+#![cfg_attr(not(bootstrap), feature(negative_impls))]
 #![feature(nll)]
 #![feature(optin_builtin_traits)]
 #![feature(pattern)]