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-rw-r--r--src/librustc_span/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/librustc_span/lib.rs b/src/librustc_span/lib.rs
index 78661cd61a3..1c3bca6608f 100644
--- a/src/librustc_span/lib.rs
+++ b/src/librustc_span/lib.rs
@@ -15,6 +15,7 @@
 #![feature(specialization)]
 
 // allow wasm target for rustc-ap-rustc_span
+#[allow(unused)]
 extern crate rustc_macros;
 
 use rustc_data_structures::AtomicRef;