[#122258] [Ruby Misc#21367] Remove link to ruby-doc.org from www.ruby-lang.org/en/documentation/ — "p8 (Petrik de Heus) via ruby-core" <ruby-core@...>
Issue #21367 has been reported by p8 (Petrik de Heus).
11 messages
2025/05/23
[ruby-core:122086] [Ruby Bug#21337] Using `not` on the RHS of a logical operator becomes valid syntax with Prism
From:
"koic (Koichi ITO) via ruby-core" <ruby-core@...>
Date:
2025-05-14 04:57:44 UTC
List:
ruby-core #122086
Issue #21337 has been reported by koic (Koichi ITO).
----------------------------------------
Bug #21337: Using `not` on the RHS of a logical operator becomes valid syntax with Prism
https://bugs.ruby-lang.org/issues/21337
* Author: koic (Koichi ITO)
* Status: Open
* ruby -v: ruby 3.4.3 (2025-04-14 revision d0b7e5b6a0) +PRISM [x86_64-darwin24]
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
The following syntax behavior differs between Ruby 3.3 (parse.y by default) and Ruby 3.4 (Prism by default).
```ruby
if true && not true; end
```
## Expected
In Ruby 3.3 and earlier, the following code results in a syntax error. The default parser is `parse.y`.
```console
$ ruby -vce 'if true && not true; end'
ruby 3.3.8 (2025-04-09 revision b200bad6cd) [x86_64-darwin24]
-e:1: syntax error, unexpected `true', expecting '('
if true && not true; end
ruby: compile error (SyntaxError)
```
The key point is that `not` is used on the right-hand side of a logical operator.
## Actual
When the default parser is switched to Prism, it is accepted as valid syntax with Ruby 3.4+ (Prism by default):
```console
$ ruby -vce 'if true && not true; end'
ruby 3.4.3 (2025-04-14 revision d0b7e5b6a0) +PRISM [x86_64-darwin24]
Syntax OK
$ ruby -vce 'if true && not true; end'
ruby 3.5.0dev (2025-05-13T02:05:19Z master 9b8c846bdf) +PRISM [x86_64-darwin24]
Syntax OK
```
Specifying parse.y causes a syntax error, as before 3.3 (parse.y by default):
```console
$ ruby -vce 'if true && not true; end'
ruby 3.3.8 (2025-04-09 revision b200bad6cd) [x86_64-darwin24]
-e:1: syntax error, unexpected `true', expecting '('
if true && not true; end
ruby: compile error (SyntaxError)
$ ruby --parser=parse.y -vce 'if true && not true; end'
ruby 3.5.0dev (2025-05-13T02:05:19Z master 9b8c846bdf) [x86_64-darwin24]
-e:1: syntax error, unexpected 'true', expecting '('
if true && not true; end
ruby: compile error (SyntaxError)
```
The behavior seen in the parse.y producing a syntax error might be probably the expected one.
Any case, it is likely that users would not expect such a discrepancy between parsers.
This issue was noticed in the context of the following RuboCop issue:
https://github.com/rubocop/rubocop/issues/14177
--
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