`Enumerable#reject`, etc. should return `Enumerable` without block
MODIFY
mrblib/enum.rb
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)

`Enumerable#reject`, etc. should return `Enumerable` without block