While doing further round-trip testing, I cam across the following issue

Original source

    module Deprecation
    {-# Deprecated ["This is a module \"deprecation\"",
               "multi-line"] #-}
       ( foo )
     where

Pretty-printed AST via ppr

   (L {examples/Deprecation.hs:(3,1)-(4,30)}
    (DeprecatedTxt
     (L {examples/Deprecation.hs:3:1-14} "{-# Deprecated")
     [
      (L {examples/Deprecation.hs:3:17-50} {FastString: "This is a module \"deprecation\""}),
      (L {examples/Deprecation.hs:4:14-25} {FastString: "multi-line"})])))

output where the FastString is converted to a string via unpackFS

    module Deprecation
    {-# Deprecated ["This is a module "deprecation"",
               "multi-line"] #-}
       ( foo )
     where

So, the ppr (via Pretty.ftext) is able to reproduce the escape characters in original string, but unpackFS does not.

Is this a problem for anyone else?

Regards

Aan