Simplify nested ParenthesizedExpr

[line-o]

(((1,2,3)))

Should be normalised to

(1,2,3)

Or even

1,2,3

Where possible

[DrRataplan]

Makes total sense! Can be built with a preprocessor: detect parenthesized expressions with a parenthesized expression and replace them by their content. We already simplify the AST in main...one-true-brace#diff-4fab5baaca5c14d2de62d8d2fceef376ddddcc8e9509d86cfa5643f51b89ce3dR78

Prettier itself does this for JavaScript, which makes me like your suggestion even more: https://prettier.io/playground/#N4Igxg9gdgLgprEAuEAKVBGA1BglLkAGhAgAcYBLaAZ2VAEMAnRiAdwAUmFaV6AbVvQCetYgCNG9MAGs4MAMr0AtnAAyFKHGQAzftTjEIYgFZwwMAOqTSyEKUZx9jAG5bxkmXPmkpGgObIMIwArgYg+koUgSFhcAAepHCMFCqw-ADyiZIwEIzsENQUlNC2CAAmRCDxWSkIMPwAKklQTBSOOnphhVB+fHAAisEQ8B18+sTG1HHy-n2Dw1pIumNhAI5D8OwspDwg9NQAtJpwZSeVQfQUfP4AwhBKSvS2-HyV3b1wAIIwQRRiwZskupNKNxiAABYwJR8CzgoqOHxgODybhFCjOIpCWxgaiiEDOUIASSgp1g8jAyXInxJ8hgQj6oLC9gKcCs9BsKHsjiSrkqGicMC29D8j0ZxB8jCctjE9DEcFe4uSsAsFDKMHByAAHAAGYgOdYUBxCkVPJadYj1MQqtUapAAJmIwX0DVlPGWYLgSjlZVOZVU9B6wWFcAAYrlHj9-M8ARAQABfONAA

(((1))) // is transformed to 1

What about this one though with nesting? While it is effectively the same, it

(1,(2,3))

or where I think they might actually make sense to be used:

(1, (2 + 3))

Some edge cases that come to mind:

• watch out for comments in this case:

((:A:)(1, (:B:)2(:C:), 3))

• And watch out for empty expressions:

let $x := () return $x

[line-o]

more edge cases

For ranges the parens are often needed to be preserved

( 1 to 3 )

empty sequences within sequences

(1, ())