From 9f18aced9f4d3c39ba6a5e10c6856c7fc9009714 Mon Sep 17 00:00:00 2001
From: KOBAYASHI Shuji <shuujii@gmail.com>
Date: Sat, 10 Aug 2019 22:18:54 +0900
Subject: `Enumerable#reject`, etc. should return `Enumerable` without block

---
 mrblib/enum.rb | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/mrblib/enum.rb b/mrblib/enum.rb
index fe40b4d27..15687e159 100644
--- a/mrblib/enum.rb
+++ b/mrblib/enum.rb
@@ -73,6 +73,8 @@ module Enumerable
   #
   # ISO 15.3.2.2.4
   def detect(ifnone=nil, &block)
+    return to_enum :detect, ifnone unless block
+
     self.each{|*val|
       if block.call(*val)
         return val.__svalue
@@ -282,6 +284,8 @@ module Enumerable
   #
   # ISO 15.3.2.2.16
   def partition(&block)
+    return to_enum :partition unless block
+
     ary_T = []
     ary_F = []
     self.each{|*val|
@@ -302,6 +306,8 @@ module Enumerable
   #
   # ISO 15.3.2.2.17
   def reject(&block)
+    return to_enum :reject unless block
+
     ary = []
     self.each{|*val|
       ary.push(val.__svalue) unless block.call(*val)
-- 
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