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-rw-r--r--lib/benchmark.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/benchmark.rb b/lib/benchmark.rb
index 9a0bbef596..8e7f778e2d 100644
--- a/lib/benchmark.rb
+++ b/lib/benchmark.rb
@@ -440,7 +440,7 @@ module Benchmark
#
# An in-place version of #add.
#
- def add!
+ def add!(&blk)
t = Benchmark::measure(&blk)
@utime = utime + t.utime
@stime = stime + t.stime