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-rw-r--r--lib/optparse.rb3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/optparse.rb b/lib/optparse.rb
index 56628079fd..d3b504a413 100644
--- a/lib/optparse.rb
+++ b/lib/optparse.rb
@@ -534,8 +534,9 @@ class OptionParser
def initialize(pattern = nil, conv = nil,
short = nil, long = nil, arg = nil,
- desc = ([] if short or long), block = Proc.new)
+ desc = ([] if short or long), block = nil, &_block)
raise if Array === pattern
+ block ||= _block
@pattern, @conv, @short, @long, @arg, @desc, @block =
pattern, conv, short, long, arg, desc, block
end