cargo fix --edition-idioms

Author: cuviper

src/lib.rs

@@ -41,10 +41,10 @@
 
 extern crate proc_macro;
 
-extern crate proc_macro2;
+use proc_macro2;
 #[macro_use]
 extern crate quote;
-extern crate syn;
+use syn;
 
 use proc_macro::TokenStream;
 use proc_macro2::Span;

tests/issue-6.rs

@@ -1,5 +1,5 @@
 #![deny(trivial_numeric_casts)]
-extern crate num;
+
 #[macro_use]
 extern crate num_derive;
 

tests/issue-9.rs

@@ -1,5 +1,5 @@
 #![deny(unused_qualifications)]
-extern crate num;
+
 #[macro_use]
 extern crate num_derive;
 use num::FromPrimitive;