[ruby-core:123384] [Ruby Bug#21623] Endless method definition without parenthesis is wrongly accepted in Prism

3 Oct 2025


      Issue #21623 has been updated by alanwu (Alan Wu).

Assignee set to prism

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Bug #21623: Endless method definition without parenthesis is wrongly accepted in Prism
https://bugs.ruby-lang.org/issues/21623#change-114755

* Author: tompng (tomoya ishida)
* Status: Open
* Assignee: prism
* ruby -v: ruby 3.5.0dev (2025-10-02T03:48:32Z master 88222caaa9) +PRISM [x86_64-linux]
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
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These are syntax error in parse.y but accepted in Prism
~~~ruby
def f x: = 1
def f ... = 1
def f * = 1
def f ** = 1
def f & = 1
def f *a = 1
def f **a = 1
def f &a = 1
~~~


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