* [ruby-core:107521] [Ruby master Bug#18577] Range#include? returns wrong result for beginless range with exclusive string end
@ 2022-02-08 16:33 takaram (Takuya Aramaki)
2022-02-09 10:56 ` [ruby-core:107529] " zverok (Victor Shepelev)
2022-02-09 19:07 ` [ruby-core:107534] " jeremyevans0 (Jeremy Evans)
0 siblings, 2 replies; 3+ messages in thread
From: takaram (Takuya Aramaki) @ 2022-02-08 16:33 UTC (permalink / raw
To: ruby-core
Issue #18577 has been reported by takaram (Takuya Aramaki).
----------------------------------------
Bug #18577: Range#include? returns wrong result for beginless range with exclusive string end
https://bugs.ruby-lang.org/issues/18577
* Author: takaram (Takuya Aramaki)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.1.0p0 (2021-12-25 revision fb4df44d16) [x86_64-linux]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
Exclusive range should not include the end value, but `(...'z').include? 'z'` returns true. `member?` and `===` behave in the same way, while `cover?` does not.
This happens when the range is beginless and its end is string.
```
irb(main):001:0> (...'z').include? 'z'
=> true
irb(main):002:0> (...'z').member? 'z'
=> true
irb(main):003:0> (...'z') === 'z'
=> true
irb(main):004:0> (...'z').cover? 'z'
=> false
```
--
https://bugs.ruby-lang.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
* [ruby-core:107529] [Ruby master Bug#18577] Range#include? returns wrong result for beginless range with exclusive string end
2022-02-08 16:33 [ruby-core:107521] [Ruby master Bug#18577] Range#include? returns wrong result for beginless range with exclusive string end takaram (Takuya Aramaki)
@ 2022-02-09 10:56 ` zverok (Victor Shepelev)
2022-02-09 19:07 ` [ruby-core:107534] " jeremyevans0 (Jeremy Evans)
1 sibling, 0 replies; 3+ messages in thread
From: zverok (Victor Shepelev) @ 2022-02-09 10:56 UTC (permalink / raw
To: ruby-core
Issue #18577 has been updated by zverok (Victor Shepelev).
It seems that the cause is unnecessary (?) [specialization](https://github.com/ruby/ruby/blob/master/range.c#L1782) of `Range#include?` for String arguments.
I believe string ranges should just fallback to the default implementation:
```ruby
(...Date.today) === Date.today
# => false
(...Date.today).cover? Date.today
# => false
(...Date.today).include? Date.today
# in `each': can't iterate from NilClass (TypeError)
```
The removal of specialization will also fix current (and possible future) discrepancies of `Range#cover?` and `Range#===` for String ranges.
If it is not acceptable (some cases of backward compatibility?), [this statement](https://github.com/ruby/ruby/blob/master/range.c#L1795) should be fixed.
cc @jeremyevans0
----------------------------------------
Bug #18577: Range#include? returns wrong result for beginless range with exclusive string end
https://bugs.ruby-lang.org/issues/18577#change-96440
* Author: takaram (Takuya Aramaki)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.1.0p0 (2021-12-25 revision fb4df44d16) [x86_64-linux]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
Exclusive range should not include the end value, but `(...'z').include? 'z'` returns true. `member?` and `===` behave in the same way, while `cover?` does not.
This happens when the range is beginless and its end is string.
```
irb(main):001:0> (...'z').include? 'z'
=> true
irb(main):002:0> (...'z').member? 'z'
=> true
irb(main):003:0> (...'z') === 'z'
=> true
irb(main):004:0> (...'z').cover? 'z'
=> false
```
--
https://bugs.ruby-lang.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
* [ruby-core:107534] [Ruby master Bug#18577] Range#include? returns wrong result for beginless range with exclusive string end
2022-02-08 16:33 [ruby-core:107521] [Ruby master Bug#18577] Range#include? returns wrong result for beginless range with exclusive string end takaram (Takuya Aramaki)
2022-02-09 10:56 ` [ruby-core:107529] " zverok (Victor Shepelev)
@ 2022-02-09 19:07 ` jeremyevans0 (Jeremy Evans)
1 sibling, 0 replies; 3+ messages in thread
From: jeremyevans0 (Jeremy Evans) @ 2022-02-09 19:07 UTC (permalink / raw
To: ruby-core
Issue #18577 has been updated by jeremyevans0 (Jeremy Evans).
zverok (Victor Shepelev) wrote in #note-1:
> It seems that the cause is unnecessary (?) [specialization](https://github.com/ruby/ruby/blob/master/range.c#L1782) of `Range#include?` for String arguments.
>
> I believe string ranges should just fallback to the default implementation:
> ```ruby
> (...Date.today) === Date.today
> # => false
> (...Date.today).cover? Date.today
> # => false
> (...Date.today).include? Date.today
> # in `each': can't iterate from NilClass (TypeError)
> ```
> The removal of specialization will also fix current (and possible future) discrepancies of `Range#cover?` and `Range#===` for String ranges.
If you want to remove the specialization, that's something that probably should be discussed at a developer meeting. I am against removing it. Not because I think the specialization is a good idea, but because I don't think it's worth breaking backwards compatibility (raising TypeError for previously working code).
> If it is not acceptable (some cases of backward compatibility?), [this statement](https://github.com/ruby/ruby/blob/master/range.c#L1795) should be fixed.
I submitted a pull request to fix this: https://github.com/ruby/ruby/pull/5541
----------------------------------------
Bug #18577: Range#include? returns wrong result for beginless range with exclusive string end
https://bugs.ruby-lang.org/issues/18577#change-96446
* Author: takaram (Takuya Aramaki)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.1.0p0 (2021-12-25 revision fb4df44d16) [x86_64-linux]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
Exclusive range should not include the end value, but `(...'z').include? 'z'` returns true. `member?` and `===` behave in the same way, while `cover?` does not.
This happens when the range is beginless and its end is string.
```
irb(main):001:0> (...'z').include? 'z'
=> true
irb(main):002:0> (...'z').member? 'z'
=> true
irb(main):003:0> (...'z') === 'z'
=> true
irb(main):004:0> (...'z').cover? 'z'
=> false
```
--
https://bugs.ruby-lang.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-02-08 16:33 [ruby-core:107521] [Ruby master Bug#18577] Range#include? returns wrong result for beginless range with exclusive string end takaram (Takuya Aramaki)
2022-02-09 10:56 ` [ruby-core:107529] " zverok (Victor Shepelev)
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