| --- | |
| src/lib.rs | 1 + | |
| 1 file changed, 1 insertion(+) | |
| diff --git b/src/lib.rs a/src/lib.rs | |
| index 2f31fc65..d1fe77e8 100644 | |
| --- b/src/lib.rs | |
| +++ a/src/lib.rs | |
| @@ -3,6 +3,7 @@ | |
| #![crate_type = "proc-macro"] | |
| #![forbid(unsafe_code)] | |
| #![warn(rust_2018_idioms, trivial_casts, unused_qualifications)] | |
| +extern crate proc_macro; | |
| use proc_macro2::{Ident, TokenStream}; | |
| use quote::{format_ident, quote}; |