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-rw-r--r--library/proc_macro/src/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/library/proc_macro/src/lib.rs b/library/proc_macro/src/lib.rs
index 6611ce30a1b..d9141eab591 100644
--- a/library/proc_macro/src/lib.rs
+++ b/library/proc_macro/src/lib.rs
@@ -33,6 +33,7 @@
 #![deny(ffi_unwind_calls)]
 #![warn(rustdoc::unescaped_backticks)]
 #![warn(unreachable_pub)]
+#![deny(unsafe_op_in_unsafe_fn)]
 
 #[unstable(feature = "proc_macro_internals", issue = "27812")]
 #[doc(hidden)]