[ruby-core:104067] [Ruby master Bug#17889] Enumerator::Lazy#with_index should return size

Issue #17889 has been updated by jeremyevans0 (Jeremy Evans).

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

I didn't bisect, but this is probably related to commit:85e43e1dfecef69b935c48c235cc20f21bd4f0d4, as it affects 2.7 and 3.0 but not 2.6.  I'll see if there is a way to fix this.

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Bug #17889: Enumerator::Lazy#with_index should return size
https://bugs.ruby-lang.org/issues/17889#change-92241

* Author: bjfish (Brandon Fish)
* Status: Open
* Priority: Normal
* ruby -v: 3.0.0
* Backport: 2.6: DONTNEED, 2.7: REQUIRED, 3.0: REQUIRED
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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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