never executed always true always false

    1 module GHC.Utils.CliOption
    2   ( Option (..)
    3   , showOpt
    4   ) where
    5 
    6 import GHC.Prelude
    7 
    8 -- -----------------------------------------------------------------------------
    9 -- Command-line options
   10 
   11 -- | When invoking external tools as part of the compilation pipeline, we
   12 -- pass these a sequence of options on the command-line. Rather than
   13 -- just using a list of Strings, we use a type that allows us to distinguish
   14 -- between filepaths and 'other stuff'. The reason for this is that
   15 -- this type gives us a handle on transforming filenames, and filenames only,
   16 -- to whatever format they're expected to be on a particular platform.
   17 data Option
   18  = FileOption -- an entry that _contains_ filename(s) / filepaths.
   19               String  -- a non-filepath prefix that shouldn't be
   20                       -- transformed (e.g., "/out=")
   21               String  -- the filepath/filename portion
   22  | Option     String
   23  deriving ( Eq )
   24 
   25 showOpt :: Option -> String
   26 showOpt (FileOption pre f) = pre ++ f
   27 showOpt (Option s)  = s