From b23fb45f9ce3cb12b33eecc9cab37adc2890f49f Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Fri, 20 Jan 2017 17:58:29 +0900
Subject: Integral#step without arg should loop forever as CRuby does.

---
 mrblib/numeric.rb | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'mrblib')

diff --git a/mrblib/numeric.rb b/mrblib/numeric.rb
index 17155bfd6..975ad973f 100644
--- a/mrblib/numeric.rb
+++ b/mrblib/numeric.rb
@@ -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)
-- 
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