Action to export pattern (:+) produces malformed export list

[Bodigrim]

Your environment

Which OS do you use? macOS
Which version of GHC do you use and how did you install it? 9.6.5, from ghcup

Which LSP client (editor/plugin) do you use? Sublime Text
Which version of HLS do you use and how did you install it? 2.9.0.1, from ghcup.

Steps to reproduce

Put

{-# LANGUAGE PatternSynonyms #-}
module Lib () where 
pattern x :+ y = (x, y)

and run code action "Export :+"

Expected behaviour

pattern (:+) is to be added to the export list.

Actual behaviour

pattern :+ is added to the export list, which is a parse error.

[pbrinkmeier]

I'll take a stab at this :)

[fendor]

Closed by #4420