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-rw-r--r--src/librustc_codegen_utils/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/librustc_codegen_utils/lib.rs b/src/librustc_codegen_utils/lib.rs
index 38d1719e776..3726e4f47b9 100644
--- a/src/librustc_codegen_utils/lib.rs
+++ b/src/librustc_codegen_utils/lib.rs
@@ -18,6 +18,7 @@
 
 #![deny(rust_2018_idioms)]
 #![deny(internal)]
+#![deny(unused_lifetimes)]
 
 #[macro_use]
 extern crate rustc;