1
2---
3 src/lib.rs | 1 +
4 1 file changed, 1 insertion(+)
5
6diff --git b/src/lib.rs a/src/lib.rs
7index d3eab1a0..8a9561ba 100644
8--- b/src/lib.rs
9+++ a/src/lib.rs
10@@ -1,3 +1,4 @@
11+extern crate proc_macro;
12 use proc_macro::TokenStream;
13 use proc_macro2::{Group, TokenStream as TokenStream2, TokenTree};
14 use quote::quote;
15