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-rw-r--r--src/libsyntax_ext/assert.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libsyntax_ext/assert.rs b/src/libsyntax_ext/assert.rs
index 6301283460a..84583d0e5ec 100644
--- a/src/libsyntax_ext/assert.rs
+++ b/src/libsyntax_ext/assert.rs
@@ -23,7 +23,7 @@ pub fn expand_assert<'cx>(
         }
     };
 
-    let sp = sp.apply_mark(cx.current_expansion.id);
+    let sp = cx.with_legacy_ctxt(sp);
     let panic_call = Mac {
         path: Path::from_ident(Ident::new(sym::panic, sp)),
         tts: custom_message.unwrap_or_else(|| {