---

yaml
---
r: 60299
b: refs/heads/master
c: 87398f3
h: refs/heads/master
i:
  60297: 3bbb9d2
  60295: 6d46df4
v: v3

Author: nikomatsakis

[refs]

@@ -1,5 +1,5 @@
 ---
-refs/heads/master: d204cfd739bfecb6252b54c5007a28559d0f9a73
+refs/heads/master: 87398f31e5615bef744f2ac3f66c00b1a7d4959e
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
 refs/heads/snap-stage3: 2d28d645422c1617be58c8ca7ad9a457264ca850
 refs/heads/try: c50a9d5b664478e533ba1d1d353213d70c8ad589

trunk/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