[ruby-core:101535] [Ruby master Bug#17409] Endless range of dates stuck on include? when miss

Issue #17409 has been updated by zverok (Victor Shepelev).


Nothing specific to dates there, and not a bug.

This is just how ranges work:
* `range.include?(x)` is basically `range.each.any? {|el| el == x }`, which, with endless range, is an infinite loop
* `range.cover?(x)` is basically` `x >= range.begin && x <= range.end`, which is instanteneous.

The behavior of `#include?` is redefined for Numeric and String, so `(1..).include?(0)` will behave like `cover?` (return `false` immediately), but with any other type, the behavior is the same as for Date.

----------------------------------------
Bug #17409: Endless range of dates stuck on include? when miss
https://bugs.ruby-lang.org/issues/17409#change-89317

* Author: gsmetal (Sergey G)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-linux]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
This code stucks (on latest ruby 2.7.1):
```ruby
require 'date'

(Date.today..).include?(Date.today - 1)
```

But it works well with `cover?`:
```ruby
2.7.1 :001 > require 'date'
 => true 
2.7.1 :002 > (Date.today..).cover?(Date.today - 1)
 => false 
```



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

Unsubscribe: <mailto:[e-mail]?subject=unsubscribe>
<http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>