add deny(rust_2018_idioms) to all crate roots.

Author: Centril

macros/src/lib.rs

@@ -1,3 +1,5 @@
+#![deny(rust_2018_idioms)]
+
 extern crate gll;
 extern crate proc_macro;
 extern crate proc_quote;

macros/tests/basic.rs

@@ -1,3 +1,5 @@
+#![deny(rust_2018_idioms)]
+
 extern crate gll;
 extern crate gll_macros;
 

macros/tests/json.rs

@@ -1,3 +1,5 @@
+#![deny(rust_2018_idioms)]
+
 extern crate gll;
 extern crate gll_macros;
 extern crate proc_quote;

src/lib.rs

@@ -1,4 +1,5 @@
 #![deny(unsafe_code)]
+#![deny(rust_2018_idioms)]
 
 extern crate indexing;
 extern crate ordermap;