From: tom@...
Date: 2019-05-30T19:08:44+00:00
Subject: [ruby-core:92894] [Ruby trunk Bug#15889] Enumerator#each_slice size FloatDomainError with infinite enumerator

Issue #15889 has been reported by Freaky (Thomas Hurst).

----------------------------------------
Bug #15889: Enumerator#each_slice size FloatDomainError with infinite enumerator
https://bugs.ruby-lang.org/issues/15889

* Author: Freaky (Thomas Hurst)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-freebsd12.0]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
Calling `#size` on an infinite `each_slice` Enumerator results in a `FloatDomainError` exception:

``` ruby
1.step.size # => Infinity
1.step.each_slice(2).size # => FloatDomainError
```

```
Traceback (most recent call last):
...
        3: from (irb):3:in `size'
        2: from (irb):3:in `div'
        1: from (irb):3:in `floor'
FloatDomainError (Infinity)
```

Looks like `enum_each_slice_size()` is missing a guard conditional prior to calling `div_int()` with the slice size.

This was reported by Josh Cheek on Twitter: https://twitter.com/josh_cheek/status/1134123733445218304



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