From 75eb59895f0de231fd8fe66fd78518387c99b9fc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20K=C3=A5re=20Alsaker?= <john.kare.alsaker@gmail.com>
Date: Thu, 13 Jul 2017 02:32:36 +0200
Subject: [PATCH] Copy a comment

---
 src/librustc/traits/select.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/librustc/traits/select.rs b/src/librustc/traits/select.rs
index 3fcd79f706b..9d5494d1fba 100644
--- a/src/librustc/traits/select.rs
+++ b/src/librustc/traits/select.rs
@@ -1500,6 +1500,9 @@ impl<'cx, 'gcx, 'tcx> SelectionContext<'cx, 'gcx, 'tcx> {
             return Ok(());
         }
 
+        // ok to skip binder because the substs on generator types never
+        // touch bound regions, they just capture the in-scope
+        // type/region parameters
         let self_ty = *obligation.self_ty().skip_binder();
         let (closure_def_id, substs) = match self_ty.sty {
             ty::TyGenerator(id, substs, _) => (id, substs),