Integral#step without arg should loop forever as CRuby does.
@@ -100,11 +100,18 @@ module Integral
# Calls the given block from +self+ to +num+
# incremented by +step+ (default 1).
#
- def step(num, step = 1, &block)
+ def step(num=nil, step=1, &block)
raise ArgumentError, "step can't be 0" if step == 0
return to_enum(:step, num, step) unless block_given?
i = if num.kind_of? Float then self.to_f else self end
+ if num == nil
+ while true
+ block.call(i)
+ i+=step
+ end
+ return self
+ end
if step > 0
while i <= num
block.call(i)
