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diff --git a/src/lib.rs b/src/lib.rs
index 3d4d185..9081ecf 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,4 @@
+extern crate proc_macro;
use proc_macro::TokenStream;
use proc_macro2::{Delimiter, Group, TokenStream as TokenStream2, TokenTree};
use quote::quote;