From: "Earlopain (Earlopain _) via ruby-core" <ruby-core@...>
Date: 2025-01-19T13:31:04+00:00
Subject: [ruby-core:120738] [Ruby master Bug#21048] [Prism] rescue in modifier form with condition behaves differently

Issue #21048 has been reported by Earlopain (Earlopain _).

----------------------------------------
Bug #21048: [Prism] rescue in modifier form with condition behaves differently
https://bugs.ruby-lang.org/issues/21048

* Author: Earlopain (Earlopain _)
* Status: Open
* ruby -v: 3.4.1
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
With the following code there is a discrepancy in how prism and parse.y consider precedence:

```rb
$called = false
def foo
  $called = true
end

foo rescue nil if false

puts "Called: #{$called}"
```

Prism interprets it as `(foo rescue nil) if false`, not calling the method. `parse.y` does `foo rescue (nil if false)` since at least Ruby 2.0

```sh
$ ruby -v
ruby 3.5.0dev (2025-01-19T12:44:20Z master f27ed98eff) +PRISM [x86_64-linux]

$ ruby code.rb
Called: true

$ ruby --parser=parse.y code.rb
Called: false
```



-- 
https://bugs.ruby-lang.org/
 ______________________________________________
 ruby-core mailing list -- ruby-core@ml.ruby-lang.org
 To unsubscribe send an email to ruby-core-leave@ml.ruby-lang.org
 ruby-core info -- https://ml.ruby-lang.org/mailman3/lists/ruby-core.ml.ruby-lang.org/