Use iter::zip in compiler/

compiler/rustc_ast_lowering/src/lib.rs

@@ -33,6 +33,7 @@
 #![feature(crate_visibility_modifier)]
 #![cfg_attr(bootstrap, feature(or_patterns))]
 #![feature(box_patterns)]
+#![feature(iter_zip)]
 #![recursion_limit = "256"]
 
 use rustc_ast::node_id::NodeMap;