---

yaml
---
r: 140886
b: refs/heads/try2
c: 87398f3
h: refs/heads/master
v: v3

Author: nikomatsakis

[refs]

@@ -5,7 +5,7 @@ refs/heads/snap-stage3: 78a7676898d9f80ab540c6df5d4c9ce35bb50463
 refs/heads/try: 519addf6277dbafccbb4159db4b710c37eaa2ec5
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105
 refs/heads/ndm: f3868061cd7988080c30d6d5bf352a5a5fe2460b
-refs/heads/try2: d204cfd739bfecb6252b54c5007a28559d0f9a73
+refs/heads/try2: 87398f31e5615bef744f2ac3f66c00b1a7d4959e
 refs/heads/dist-snap: ba4081a5a8573875fed17545846f6f6902c8ba8d
 refs/tags/release-0.2: c870d2dffb391e14efb05aa27898f1f6333a9596
 refs/tags/release-0.3: b5f0d0f648d9a6153664837026ba1be43d3e2503

branches/try2/src/librustc/middle/borrowck/gather_loans/lifetime.rs

@@ -170,6 +170,11 @@ impl GuaranteeLifetimeContext {
 
     fn is_rvalue_or_immutable(&self,
                               cmt: mc::cmt) -> bool {
+        //! We can omit the root on an `@T` value if the location
+        //! that holds the box is either (1) an rvalue, in which case
+        //! is is in a non-user-accessible temporary, or (2) an immutable
+        //! lvalue.
+
         cmt.mutbl.is_immutable() || match cmt.guarantor().cat {
             mc::cat_rvalue => true,
             _ => false