Remove unnecessary extern crate proc_macro

Fixes rust-lang#2579.
slyvic · Feb 22, 2022 · 99c373e · 99c373e
1 parent 190ca67
commit 99c373e
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diff --git a/listings/ch19-advanced-features/listing-19-31/hello_macro/hello_macro_derive/src/lib.rs b/listings/ch19-advanced-features/listing-19-31/hello_macro/hello_macro_derive/src/lib.rs
@@ -1,5 +1,3 @@
-extern crate proc_macro;
-
 use proc_macro::TokenStream;
 use quote::quote;
 use syn;

diff --git a/listings/ch19-advanced-features/listing-19-33/hello_macro/hello_macro_derive/src/lib.rs b/listings/ch19-advanced-features/listing-19-33/hello_macro/hello_macro_derive/src/lib.rs
@@ -1,5 +1,3 @@
-extern crate proc_macro;
-
 use proc_macro::TokenStream;
 use quote::quote;
 use syn;

diff --git a/...s/ch19-advanced-features/no-listing-21-pancakes/hello_macro/hello_macro_derive/src/lib.rs b/...s/ch19-advanced-features/no-listing-21-pancakes/hello_macro/hello_macro_derive/src/lib.rs
@@ -1,5 +1,3 @@
-extern crate proc_macro;
-
 use proc_macro::TokenStream;
 use quote::quote;
 use syn;