From: nagachika00@...
Date: 2021-05-29T05:05:25+00:00
Subject: [ruby-core:104093] [Ruby master Bug#17889] Enumerator::Lazy#with_index should return size

Issue #17889 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 2.6: DONTNEED, 2.7: REQUIRED, 3.0: REQUIRED to 2.6: DONTNEED, 2.7: REQUIRED, 3.0: DONE

ruby_3_0 20bf397f7cebd8156d76941dd54659cf9b8c8fe7 merged revision(s) fd8991f797c145615820b4c76e6b7ac5a71339ea.

----------------------------------------
Bug #17889: Enumerator::Lazy#with_index should return size
https://bugs.ruby-lang.org/issues/17889#change-92266

* Author: bjfish (Brandon Fish)
* Status: Closed
* Priority: Normal
* ruby -v: 3.0.0
* Backport: 2.6: DONTNEED, 2.7: REQUIRED, 3.0: DONE
----------------------------------------
The following example shows `#size` returns `nil` when the `size` was provided to `new` as `3`.

**Example** 
``` ruby
p Enumerator::Lazy.new([1, 2, 3], 3){|y, v| y << v}.with_index.size
```
**Expected Result**
``` ruby
3
```
**Actual Result**
``` ruby
nil
```



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