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-rw-r--r--compiler/rustc_serialize/src/lib.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/rustc_serialize/src/lib.rs b/compiler/rustc_serialize/src/lib.rs
index bb822c611a1..b67b7d79d97 100644
--- a/compiler/rustc_serialize/src/lib.rs
+++ b/compiler/rustc_serialize/src/lib.rs
@@ -8,7 +8,7 @@
 #![doc(rust_logo)]
 #![allow(internal_features)]
 #![feature(rustdoc_internals)]
-#![feature(associated_type_bounds)]
+#![cfg_attr(bootstrap, feature(associated_type_bounds))]
 #![feature(const_option)]
 #![feature(core_intrinsics)]
 #![feature(generic_nonzero)]