Bug #21660: No-parentheses endless method definition that has parameter destructuring is wrongly accepted in Prism

• Status: Open
• Assignee: prism
• Target version: -
• 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

[tompng (tomoya ishida)]

This is syntax error in parse.y but not in Prism.

def f a, (b) = 1

Related to #21623

[Earlopain (Earlopain _)]

Sorry, I forgot about your comment on https://github.com/ruby/prism/pull/3674. https://github.com/ruby/prism/pull/3700 will fix this