Issue #19134 has been updated by shugo (Shugo Maeda). I've created a pull request: https://github.com/ruby/ruby/pull/6818 With this change a test of rbs.gem fails because argument types of` def foo(...)` is changed to `(*untyped, **untyped **)` from `(*untyped)`, but I believe it's right. (however, the specifal variable name `**` should be hidden by rbs.gem.) I've created a issue: https://github.com/ruby/rbs/issues/1163 ---------------------------------------- Feature #19134: ** is not allowed in def foo(...) https://bugs.ruby-lang.org/issues/19134#change-100289 * Author: shugo (Shugo Maeda) * Status: Open * Priority: Normal * Assignee: matz (Yukihiro Matsumoto) ---------------------------------------- `*` and `&` are allowed in the body of a method with `...` argument forwarding, but `**` is not allowed. ``` def foo(...) bar(*) # OK baz(&) # OK quux(**) # NG end ``` Is it intended behavior? It seems that parse.y has code like `#ifdef RUBY3_KEYWORDS`, and if RUBY3_KEYWORDS, `**` will also be supported. -- https://bugs.ruby-lang.org/