Bug #21623: Endless method definition without parenthesis is wrongly accepted in Prism

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

[tompng (tomoya ishida)]

These are syntax error in parse.y but accepted in Prism

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

[alanwu (Alan Wu)]

• Assignee set to prism