[ruby-core:123646] [Ruby Bug#21661] Endless method definition as a default value of block parameter is wrongly accepted in Prism
From:
"Earlopain (Earlopain _) via ruby-core" <ruby-core@...>
Date:
2025-11-02 12:00:23 UTC
List:
ruby-core #123646
Issue #21661 has been updated by Earlopain (Earlopain _).
It isn't specifically about block locals, `p do |a = def f = 1, b| end` is the same.
`p do |a = def f = 1| 2; b|c end` becomes `p do |a = (def f = 1| 2); b|c end`, so one block local `b` and method body of `c`. The same issue as the first example I believe.
That said, it looks inconsistent in parse.y: `def foo(a = def f = 1, b); end` and `->(a = def f = 1; b) {}` is accepted. Why is it ok in method and lamba parameters but not in block parameters? I feel like it should be rejected in all these cases.
----------------------------------------
Bug #21661: Endless method definition as a default value of block parameter is wrongly accepted in Prism
https://bugs.ruby-lang.org/issues/21661#change-115029
* Author: tompng (tomoya ishida)
* Status: Open
* Assignee: prism
* ruby -v: ruby 3.5.0dev (2025-11-01T00:18:01Z master 17a7b4e031) +PRISM [x86_64-linux]
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
These are syntax error in parse.y but not in Prism.
~~~ruby
p do |a = def f = 1; b| end
p do |a = def f = 1| 2; b|c end # `|` inside block parameter
~~~
Normal assignment as a default value `p do |a = b = 1| end` is already syntax error.
--
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/