---

yaml
---
r: 232595
b: refs/heads/try
c: 81eab1c
h: refs/heads/master
i:
  232593: e04545b
  232591: a8117c4
v: v3

Author: nikomatsakis

[refs]

@@ -1,7 +1,7 @@
 ---
 refs/heads/master: edeb4f1c86cbf6af8ef9874d4b3af50f721ea1b8
 refs/heads/snap-stage3: 1af31d4974e33027a68126fa5a5a3c2c6491824f
-refs/heads/try: 57909f7068c5a2fb63f15bc43a7d3e823205608a
+refs/heads/try: 81eab1cab6e96b4430409245b83cc51cd40c2f9f
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105
 refs/tags/release-0.2: c870d2dffb391e14efb05aa27898f1f6333a9596
 refs/tags/release-0.3: b5f0d0f648d9a6153664837026ba1be43d3e2503

branches/try/src/librustc/middle/free_region.rs

@@ -8,7 +8,12 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! This file defines
+//! This file handles the relationships between free regions --
+//! meaning lifetime parameters. Ordinarily, free regions are
+//! unrelated to one another, but they can be related vai implied or
+//! explicit bounds.  In that case, we track the bounds using the
+//! `TransitiveRelation` type and use that to decide when one free
+//! region outlives another and so forth.
 
 use middle::ty::{self, FreeRegion, Region};
 use middle::wf::ImpliedBound;