0
@@ -84,6 +84,7 @@ module Benchmark
0
     end
0
     
0
     def titles(titles)
0
+      @columns ||= Dictionary.new
0
       @columns.merge!(titles)
0
     end
0
     
0
@@ -95,13 +96,13 @@ module Benchmark
0
     end
0
     
0
     def report(str, &blk)
0
-      @groups ||= Dictionary.new
0
+      @groups ||= Dictionary.new {|h,k| h[k] = Dictionary.new}
0
       if !@columns || @columns.size == 1
0
-        @groups[@current_group || "default"][str] = [blk]
0
+        @groups[@current_group || ""][str] = [blk]
0
       else
0
         report = GroupReport.new(@columns.keys)
0
         report.instance_eval(&blk)
0
-        @groups[@current_group || "default"][str] = report.runs
0
+        @groups[@current_group || ""][str] = report.runs
0
       end
0
     end
0