cleanup

Author: tgross35

compiler/rustc_builtin_macros/src/standard_library_imports.rs

@@ -39,7 +39,6 @@ pub fn inject(
     let ecfg = ExpansionConfig::default("std_lib_injection".to_string(), features);
     let cx = ExtCtxt::new(sess, ecfg, resolver, None);
 
-    // .rev() to preserve ordering above in combination with insert(0, ...)
     let ident_span = if edition >= Edition2018 { span } else { call_site };
     let item = cx.item(
         span,