[ruby-core:101129] [Ruby master Feature#17347] Enumerator::Chain of Enumerator::Lazy should be lazy

Issue #17347 has been updated by asilano (Chris Howlett).


Is it a duplicate? I can see it's similar, but I'm not entirely sure fixing #17216 will fix this. Willing to be wrong, though.

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Feature #17347: Enumerator::Chain of Enumerator::Lazy should be lazy
https://bugs.ruby-lang.org/issues/17347#change-88810

* Author: asilano (Chris Howlett)
* Status: Open
* Priority: Normal
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ruby 2.6.6p146 (2020-03-31 revision 67876) [x86_64-linux]

Consider the following script:
``` ruby
a = [1,2,3].lazy
p a
b = [4,5,6].lazy
p b
c = a + b
p c
```

This gives the output:
```
#<Enumerator::Lazy: [1, 2, 3]>
#<Enumerator::Lazy: [4, 5, 6]>
#<Enumerator::Chain: [#<Enumerator::Lazy: [1, 2, 3]>, #<Enumerator::Lazy: [4, 5, 6]>]>
```

Note that `c` is just `Enumerator::Chain`; but all its component enumerators are lazy, so it would be nice if `c` were lazy.

That is, I'd like the output to be:
```
#<Enumerator::Lazy: [1, 2, 3]>
#<Enumerator::Lazy: [4, 5, 6]>
#<Enumerator::Lazy: #<Enumerator::Chain: [#<Enumerator::Lazy: [1, 2, 3]>, #<Enumerator::Lazy: [4, 5, 6]>]>>
```




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