The new-style arguments delegation included in Ruby 2.7 and expanded in
Ruby 3.0 is required to be parenthesized, since the syntax is clashing
with the endless `start...` range, which can be started with `start ...`
as well. Currently, the most iffy cop of them all is issuing offenses
for:

```ruby
def delegated_call(...)
  @proxy.call(...)
             ^^^^^ Omit parentheses for method calls with arguments.
end
```

Removing the parens will start an endless range with the beginning
being the result of the method call without arguments. See the parse
trees below for more details:

```bash
-> ruby-parse -e "def foo(...); bar(...); end"
(def :foo
  (args
    (forward-arg))
  (send nil :bar
    (forwarded-args)))

-> ruby-parse -e "def foo(...); bar ...; end"
(def :foo
  (args
    (forward-arg))
  (erange
    (send nil :bar) nil))

-> ruby-parse -e "def foo(...); bar...; end"
(def :foo
  (args
    (forward-arg))
  (erange
    (send nil :bar) nil))
```

We don't want that so allow the parens and leave this gotcha to the poor
developer that's gonna run into it.

…alid