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-rw-r--r--rust/proc-macro2/probe.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/rust/proc-macro2/probe.rs b/rust/proc-macro2/probe.rs
index b67f52036218..d68aa8cfd85e 100644
--- a/rust/proc-macro2/probe.rs
+++ b/rust/proc-macro2/probe.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
#![allow(dead_code)]
#[cfg(proc_macro_span)]