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-rw-r--r--rust/proc-macro2/fallback.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/rust/proc-macro2/fallback.rs b/rust/proc-macro2/fallback.rs
index 1560105cfd25..9e005d67f7f5 100644
--- a/rust/proc-macro2/fallback.rs
+++ b/rust/proc-macro2/fallback.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
#[cfg(wrap_proc_macro)]
use crate::imp;
#[cfg(span_locations)]