[ruby-core:119328] [Ruby master Bug#20764] Forwarding parameter `...` is wrongly allowed in lambda

Issue #20764 has been reported by tompng (tomoya ishida).

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Bug #20764: Forwarding parameter `...` is wrongly allowed in lambda
https://bugs.ruby-lang.org/issues/20764

* Author: tompng (tomoya ishida)
* Status: Open
* ruby -v: ruby 3.4.0dev (2024-09-27T00:58:32Z master 0c25eb4ffe) +PRISM [x86_64-linux]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
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These codes are all syntax error
~~~ruby
->...{}
->(...){}
->(a,...){}
~~~
But these are allowed in --parser=parse.y. It should be syntax error
~~~ruby
->a,...{}
->(a=1,...){}
~~~

~~~
# ruby --parser=parse.y -e "p ->a,...{}.parameters"
[[:opt, :b], [:rest, :*], [:keyrest, :**], [:block, :&]]

# ruby --parser=parse.y -e "p ->(a=1,...){}.parameters"
[[:opt, :b], [:rest, :*], [:keyrest, :**], [:block, :&]]

# ruby --parser=parse.y -e "p ->(a,...){}.parameters"
-e:1: syntax error, unexpected ...
p ->(a,...){}.parameters
ruby: compile error (SyntaxError)
~~~



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