packaging/extern.patch


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diff --git a/src/lib.rs b/src/lib.rs
index 082f734..ced08f8 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -4,6 +4,8 @@ use quote::quote;
 use syn::parse::{Parse, ParseStream, Parser, Result};
 use syn::visit_mut::VisitMut;
 
+extern crate proc_macro;
+
 struct Scrub<'a> {
     /// Whether the stream is a try stream.
     is_try: bool,