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