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-rw-r--r--src/libsyntax_ext/concat.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libsyntax_ext/concat.rs b/src/libsyntax_ext/concat.rs
index 4cd17531a45..ffa5154ca0c 100644
--- a/src/libsyntax_ext/concat.rs
+++ b/src/libsyntax_ext/concat.rs
@@ -59,6 +59,6 @@ pub fn expand_syntax_ext(
     } else if has_errors {
         return DummyResult::any(sp);
     }
-    let sp = sp.apply_mark(cx.current_expansion.id);
+    let sp = cx.with_legacy_ctxt(sp);
     base::MacEager::expr(cx.expr_str(sp, Symbol::intern(&accumulator)))
 }