---

yaml
---
r: 123698
b: refs/heads/try
c: 3c7f619
h: refs/heads/master
v: v3

Author: emberian

[refs]

@@ -2,7 +2,7 @@
 refs/heads/master: da4e4e4e0a7778a85748aa4a303b13f603e96b4b
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
 refs/heads/snap-stage3: 8ddd286ea4ba4384a0dc9eae393ed515460a986e
-refs/heads/try: c2dd553bed572368953801dd1d339013f58b53d6
+refs/heads/try: 3c7f619b76b87c400e270eebfa7625844afcd673
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105
 refs/heads/ndm: f3868061cd7988080c30d6d5bf352a5a5fe2460b
 refs/heads/try2: 147ecfdd8221e4a4d4e090486829a06da1e0ca3c

branches/try/src/libcore/str.rs

@@ -1764,7 +1764,9 @@ impl<'a> StrSlice<'a> for &'a str {
 
     #[inline]
     fn slice(&self, begin: uint, end: uint) -> &'a str {
-        assert!(self.is_char_boundary(begin) && self.is_char_boundary(end));
+        assert!(self.is_char_boundary(begin) && self.is_char_boundary(end),
+                "index {} and/or {} in `{}` do not lie on character boundary", begin,
+                end, *self);
         unsafe { raw::slice_bytes(*self, begin, end) }
     }
 
@@ -1775,7 +1777,8 @@ impl<'a> StrSlice<'a> for &'a str {
 
     #[inline]
     fn slice_to(&self, end: uint) -> &'a str {
-        assert!(self.is_char_boundary(end));
+        assert!(self.is_char_boundary(end), "index {} in `{}` does not lie on \
+                a character boundary", end, *self);
         unsafe { raw::slice_bytes(*self, 0, end) }
     }