[ruby-core:115369] [Ruby master Bug#11808] Different behavior between Enumerable#grep and Array#grep

Issue #11808 has been updated by noelrap (Noel Rappin).


This appears to be fixed in 3.3.0dev as of Nov 2023, 


``` ruby
irb(main):001* class Test
irb(main):002*   include Enumerable
irb(main):003*   def each
irb(main):004*     return enum_for(:each) unless block_given?
irb(main):005*     yield "Hello"
irb(main):006*     yield "World"
irb(main):007*   end
irb(main):008> end
=> :each
irb(main):009>
irb(main):010> enum = Test.new
=> #<Test:0x0000000102ba5038>
irb(main):011> array = ["Hello", "World"]
=> ["Hello", "World"]
irb(main):012>
irb(main):013> enum.grep(/^(.)/) {$1}
=> ["H", "W"]
```

However, it was still broken in 3.2.2. It's not clear to me when the behavior changed.

----------------------------------------
Bug #11808: Different behavior between Enumerable#grep and Array#grep
https://bugs.ruby-lang.org/issues/11808#change-105298

* Author: BenOlive (Ben Olive)
* Status: Open
* Priority: Normal
* Assignee: ko1 (Koichi Sasada)
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
Regex special global variables are available within the block for `Array#grep`, but are nil within the block for `Enumerable#grep`.

Here is an example that explains it better:

~~~ruby
class Test
  include Enumerable
  def each
    return enum_for(:each) unless block_given?
    yield "Hello"
    yield "World"
  end
end

enum = Test.new
array = ["Hello", "World"]

enum.grep(/^(.)/) {$1} # => [nil, nil]
array.grep(/^(.)/) {$1} # => ["H", "W"]
~~~

Tested on 2.0.0, 2.1.5, & 2.2.2



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