2 files changed, 6 insertions, 1 deletions
diff --git a/ChangeLog b/ChangeLog
index aed3822e5d..b662523861 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu May 31 17:27:53 2007  Nobuyoshi Nakada  <[email protected]>
+
+	* lib/benchmark.rb (Benchmark::Job::item): avoid modifying the
+	  argument unintentionally.  [ruby-talk:253676]
+
 Thu May 31 02:12:32 2007  Masatoshi SEKI  <[email protected]>
 
 	* lib/rinda/tuplespace.rb (Rinda::TupleBag): create index on tuple bag
diff --git a/lib/benchmark.rb b/lib/benchmark.rb
index 36e593518f..c7c3935131 100644
--- a/lib/benchmark.rb
+++ b/lib/benchmark.rb
@@ -331,7 +331,7 @@ module Benchmark
     #
     def item(label = "", &blk) # :yield:
       raise ArgmentError, "no block" unless block_given?
-      label.concat ' '
+      label += ' '
       w = label.length
       @width = w if @width < w
       @list.push [label, blk]