From: "ufuk (Ufuk Kayserilioglu) via ruby-core" <ruby-core@...>
Date: 2024-12-11T16:53:32+00:00
Subject: [ruby-core:120180] [Ruby master Bug#20945] Behaviour mismatch between parse.y and prism with character literals AST nodes

Issue #20945 has been updated by ufuk (Ufuk Kayserilioglu).


`Parser::CurrentRuby` is coming from the [parser gem](https://github.com/whitequark/parser), and has nothing to do with parse.y, it is pure Ruby implementation of a Ruby parser.

If you think the AST of Prism should behave differently, please open an issue on the https://github.com/ruby/prism repo itself.

----------------------------------------
Bug #20945: Behaviour mismatch between parse.y and prism with character literals AST nodes
https://bugs.ruby-lang.org/issues/20945#change-110939

* Author: viralpraxis (Iaroslav Kurbatov)
* Status: Open
* ruby -v: ruby 3.3.6 (2024-11-05 revision 75015d4c1f) [x86_64-linux]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------

AST string node (character literals) values returned by parse.y are, for some reason, frozen, whereas Prism does not freeze them:


``` ruby
require 'prism'
require 'parser/current'

puts Prism::VERSION
puts Parser::VERSION

p Prism.parse('?a').value.statements.child_nodes.first.content.then { [_1.class, _1.frozen?] }
p Parser::CurrentRuby.parse('?a').children[0].then { [_1.class, _1.frozen? ]}

p Prism.parse('?\n').value.statements.child_nodes.first.content.then { [_1.class, _1.frozen?] }
p Parser::CurrentRuby.parse('?\n').children[0].then { [_1.class, _1.frozen? ]}
```

output:

```
1.2.0
3.3.6.0
[String, false]
[String, false]
[String, false]
[String, true]
```

I���m not sure whether this is a bug in Parser, Prism, or something else.



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