Fix parenthesization of jumps in ranges #1798
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This syntax tree incorrectly gets turned into `return ..=return` when printed, which is a return whose value is a RangeToInclusive. The original is a Range whose endpoints are returns.
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Previously, the syntax tree for
(return)..=return(with paren flattened away) would get incorrectly turned intoreturn ..=returnwhich means a different thing.