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-rw-r--r--src/librustc_metadata/rmeta/encoder.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/librustc_metadata/rmeta/encoder.rs b/src/librustc_metadata/rmeta/encoder.rs
index acae44e6bf7..c91f81a1340 100644
--- a/src/librustc_metadata/rmeta/encoder.rs
+++ b/src/librustc_metadata/rmeta/encoder.rs
@@ -162,7 +162,7 @@ impl<'a, 'tcx> SpecializedEncoder<ExpnId> for EncodeContext<'a, 'tcx> {
     fn specialized_encode(&mut self, expn: &ExpnId) -> Result<(), Self::Error> {
         rustc_span::hygiene::raw_encode_expn_id(
             *expn,
-            &mut self.hygiene_ctxt,
+            &self.hygiene_ctxt,
             ExpnDataEncodeMode::Metadata,
             self,
         )