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Support for untyped function parameters in RBS #1466

Description

@nanachi-code

This syntax was introduced in RBS 3.5.

class Foo
  def dynamic: (?) -> void
end

Right now if I try to format this it will raise
undefined method `required_positionals' for #<RBS::Types::UntypedFunction:0x000002913499d528 @return_type=#<RBS::Types::Bases::Void:0x000002913499d618 @location=#<RBS::Location:1820 buffer=a.rbs, start=170:58, pos=7202...7206, children= source="void">>>.
SyntaxTree can generate the AST for it just fine with the syntax_tree-rbs plugin so my guess is that this is a Prettier problem.

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