[ruby-core:123383] [Ruby Bug#21623] Endless method definition without parenthesis is wrongly accepted in Prism

Issue #21623 has been reported by tompng (tomoya ishida). ---------------------------------------- Bug #21623: Endless method definition without parenthesis is wrongly accepted in Prism https://bugs.ruby-lang.org/issues/21623 * Author: tompng (tomoya ishida) * Status: Open * 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 ---------------------------------------- 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 ~~~ -- https://bugs.ruby-lang.org/