[ruby-core:120154] [Ruby master Bug#20936] Enumerator's #size returned by Range#reverse_each raises an exception for beginningless Range

Issue #20936 has been updated by andrykonchin (Andrew Konchin).


It works. Thank you!

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Bug #20936: Enumerator's #size returned by Range#reverse_each raises an exception for beginningless Range
https://bugs.ruby-lang.org/issues/20936#change-110906

* Author: andrykonchin (Andrew Konchin)
* Status: Open
* ruby -v: 3.4.0dev
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
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`(..3).reverse_each.size` is supposed to return `Infinity` (at least it does so in Ruby 3.3). But in Ruby 3.4 preview it raises `can't iterate from NilClass (TypeError)` what seems a regression.

Ruby 3.3.5:

```
$ ruby -v -e 'p (..3).reverse_each.size'
ruby 3.3.5 (2024-09-03 revision ef084cc8f4) [x86_64-darwin23]
Infinity

$ ruby -v -e 'p (1..).reverse_each.size'
ruby 3.3.5 (2024-09-03 revision ef084cc8f4) [x86_64-darwin23]
Infinity
```

3.4.0dev:

```
$ ruby -v -e 'p (1..).reverse_each.size'
ruby 3.4.0dev (2024-12-09T08:00:19Z master 652b0c13a7) +PRISM [x86_64-darwin23]
Infinity

$ ruby -v -e 'p (..3).reverse_each.size'
ruby 3.4.0dev (2024-12-09T08:00:19Z master 652b0c13a7) +PRISM [x86_64-darwin23]
-e:1:in 'Enumerator#size': can't iterate from NilClass (TypeError)
	from -e:1:in '<main>'
```



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