From: "eileencodes (Eileen Uchitelle) via ruby-core" <ruby-core@...>
Date: 2025-02-27T22:15:43+00:00
Subject: [ruby-core:121203] [Ruby master Bug#21152] Enumerator's #size returned by Range#reverse_each raises an exception for endless Range

Issue #21152 has been updated by eileencodes (Eileen Uchitelle).


In 3.3 `each` does raise with this example:

```
Range.new(nil,1).each do |x|
  p x
end
```

And `reverse_each` does not. It feels like to me that 3.4 is more correct than 3.3.

----------------------------------------
Bug #21152: Enumerator's #size returned by Range#reverse_each raises an exception for endless Range
https://bugs.ruby-lang.org/issues/21152#change-112140

* Author: andrykonchin (Andrew Konchin)
* Status: Open
* ruby -v: 3.4.2
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
I've noticed a change between 3.3 and 3.4 in a way how `Range#reverse_each` behaves:

Ruby 3.3:

```ruby
Range.new("a", nil).size # => nil
Range.new(1, nil).size # => Infinity

Range.new("a", nil).reverse_each.size # => nil
Range.new(1, nil).reverse_each.size # => Infinity
```

Ruby 3.4

```ruby
Range.new("a", nil).size # => nil
Range.new(1, nil).size # => Infinity

Range.new("a", nil).reverse_each.size # can't iterate from NilClass (TypeError)
Range.new(1, nil).reverse_each.size # can't iterate from NilClass (TypeError)
```



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