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-rw-r--r--src/libstd/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index 3c01de2e997..0396ba362bd 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -221,6 +221,7 @@
 // Don't link to std. We are std.
 #![no_std]
 
+#![deny(bare_trait_objects)]
 #![deny(missing_docs)]
 #![deny(missing_debug_implementations)]