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-rw-r--r--src/libsyntax_ext/cfg.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libsyntax_ext/cfg.rs b/src/libsyntax_ext/cfg.rs
index 0342e442df2..3c33baf95a5 100644
--- a/src/libsyntax_ext/cfg.rs
+++ b/src/libsyntax_ext/cfg.rs
@@ -16,7 +16,7 @@ pub fn expand_cfg(
     sp: Span,
     tts: TokenStream,
 ) -> Box<dyn base::MacResult + 'static> {
-    let sp = cx.with_legacy_ctxt(sp);
+    let sp = cx.with_def_site_ctxt(sp);
 
     match parse_cfg(cx, sp, tts) {
         Ok(cfg) => {