Cannot format operators starting with a hash when using UnboxedSums or UnboxedTuples

[wismill]

Describe the bug Ormolu formats ( #<| ) as (#<|) when -XUnboxedSums or -XUnboxedTuples is set, thus the formatted code generates a parser error. I think it applies to any operator starting with #.

To Reproduce

Format the following file with --unsafe (else it fails).

{-# LANGUAGE UnboxedTuples #-}

module Foo (( #<| )) where

( #<| ) :: Int -> Int -> Int
( #<| ) = (+)

The generated code does not compile.

Expected behavior Ormolu should keep the spaces to be valid code, i.e. ( #<| ) should be unchanged.

Environment

• OS name + version: Linux (openSUSE Tumbleweed 20230828)
• Version of the code: ormolu 0.7.1.0 using ghc-lib-parser 9.6.2.20230523

[wismill]

@amesgen Thank you, that was fast!