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-rw-r--r--rust/proc-macro2/extra.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/rust/proc-macro2/extra.rs b/rust/proc-macro2/extra.rs
index 522a90e136be..55feb5ec7526 100644
--- a/rust/proc-macro2/extra.rs
+++ b/rust/proc-macro2/extra.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
//! Items which do not have a correspondence to any API in the proc_macro crate,
//! but are necessary to include in proc-macro2.