Issue #17789 has been reported by soudai_s (Soudai Sasada).

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Bug #17789: Incompatible behavior of Enumarator::Lazy#with_index
https://bugs.ruby-lang.org/issues/17789

* Author: soudai_s (Soudai Sasada)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.0.1p64 (2021-04-05 revision 0fb782ee38) [x86_64-darwin20]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
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this method ignores the block passed to it, but this behavior looks different from the Enumerator (super class).

```
$ ruby -e '%w(a).lazy.with_index { |s, i| puts "#{s} => #{i}" }'
a => 0 # Expected, but doesn't actually print anything
```
After confirmation I found #16414 but this behavior was not fixed and the doc in the modified source code states: "If a block given, iterates the given block for each element".
Is this behavior intended?



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