From af38d71b173616bb08133207d794fab51d45aa0c Mon Sep 17 00:00:00 2001
From: Santiago Pastorino <spastorino@gmail.com>
Date: Sun, 22 Nov 2020 20:12:20 -0300
Subject: [PATCH] Add super_traits_of docs

---
 compiler/rustc_typeck/src/collect.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/compiler/rustc_typeck/src/collect.rs b/compiler/rustc_typeck/src/collect.rs
index 32527a7793423..6cd4acf5de62c 100644
--- a/compiler/rustc_typeck/src/collect.rs
+++ b/compiler/rustc_typeck/src/collect.rs
@@ -1115,6 +1115,9 @@ fn super_predicates_that_define_assoc_type(
     }
 }
 
+/// Ensures that the super traits of the trait with a `DefId`
+/// of `trait_def_id` are converted and stored. This also ensures that
+/// the transitive super traits are converted.
 fn super_traits_of(tcx: TyCtxt<'_>, trait_def_id: DefId) -> FxHashSet<DefId> {
     let mut set = FxHashSet::default();
     let mut stack = vec![trait_def_id];