From d797a8549124b64410ae9e45392eac328aa71829 Mon Sep 17 00:00:00 2001
From: Jack Huey <jack.huey@umassmed.edu>
Date: Sun, 17 Jan 2021 12:32:05 -0500
Subject: [PATCH] Add comment about Encodable/Decodable impl

---
 compiler/rustc_middle/src/ty/sty.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/compiler/rustc_middle/src/ty/sty.rs b/compiler/rustc_middle/src/ty/sty.rs
index cdf443975f42..e08233b545d2 100644
--- a/compiler/rustc_middle/src/ty/sty.rs
+++ b/compiler/rustc_middle/src/ty/sty.rs
@@ -955,6 +955,8 @@ impl<'tcx> PolyExistentialTraitRef<'tcx> {
 /// erase, or otherwise "discharge" these bound vars, we change the
 /// type from `Binder<T>` to just `T` (see
 /// e.g., `liberate_late_bound_regions`).
+///
+/// `Decodable` and `Encodable` is implemented for `Binder<T>` using the `impl_binder_encode_decode!` macro. 
 #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
 pub struct Binder<T>(T);