From: "kyanagi (Kouhei Yanagita)" <noreply@...>
Date: 2022-01-27T05:58:10+00:00
Subject: [ruby-core:107299] [Ruby master Feature#18551] Make Range#reverse_each to raise an exception if endless

Issue #18551 has been reported by kyanagi (Kouhei Yanagita).

----------------------------------------
Feature #18551: Make Range#reverse_each to raise an exception if endless
https://bugs.ruby-lang.org/issues/18551

* Author: kyanagi (Kouhei Yanagita)
* Status: Open
* Priority: Normal
----------------------------------------
https://github.com/ruby/ruby/pull/5498

Currently, `Range#reverse_each` for an endless range never returns.

```
% ruby -e '(1..).reverse_each { }'
# never return ...
```

(This is because `Enumerable#reverse_each` tries `#to_a` and `#to_a` for an endless range comes into an infinite loop.)

I think `Range#reverse_each` for an endless range should raise an exception, similar to `Range#each` for a beginless range.

```
% ruby -e '(..1).each { }' 
-e:1:in `each': can't iterate from NilClass (TypeError)
	from -e:1:in `<main>'
```




-- 
https://bugs.ruby-lang.org/

Unsubscribe: <mailto:ruby-core-request@ruby-lang.org?subject=unsubscribe>
<http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>