1 files changed, 12 insertions, 5 deletions
diff --git a/src/components/util/range.rs b/src/components/util/range.rs
index e52dbae02ab..c256ce3d1c8 100644
--- a/src/components/util/range.rs
+++ b/src/components/util/range.rs
@@ -4,6 +4,7 @@
 
 use std::cmp::{max, min};
 use std::iter;
+use std::fmt;
 
 enum RangeRelation {
     OverlapsBegin(/* overlap */ uint),
@@ -21,6 +22,12 @@ pub struct Range {
     priv len: uint
 }
 
+impl fmt::Default for Range {
+    fn fmt(obj: &Range, f: &mut fmt::Formatter) {
+        write!(f.buf, "[{} .. {})", obj.begin(), obj.end());
+    }
+}
+
 impl Range {
     #[inline]
     pub fn new(off: uint, len: uint) -> Range {
@@ -131,15 +138,15 @@ impl Range {
             let overlap = other.end() - self.begin();
             return OverlapsEnd(overlap);
         }
-        fail!(fmt!("relation_to_range(): didn't classify self=%?, other=%?",
-                  self, other));
+        fail!("relation_to_range(): didn't classify self={:?}, other={:?}",
+              self, other);
     }
 
     #[inline]
     pub fn repair_after_coalesced_range(&mut self, other: &Range) {
         let relation = self.relation_to_range(other);
-        debug!("repair_after_coalesced_range: possibly repairing range %?", self);
-        debug!("repair_after_coalesced_range: relation of original range and coalesced range(%?): %?",
+        debug!("repair_after_coalesced_range: possibly repairing range {:?}", self);
+        debug!("repair_after_coalesced_range: relation of original range and coalesced range({:?}): {:?}",
                other, relation);
         match relation {
             EntirelyBefore => { },
@@ -152,6 +159,6 @@ impl Range {
                 self.reset(other.begin(), len);
             }
         };
-        debug!("repair_after_coalesced_range: new range: ---- %?", self);
+        debug!("repair_after_coalesced_range: new range: ---- {:?}", self);
     }
 }