Commits on Nov 26, 2022

1. Fix sol#530 Introduce HpackError type, for Hpack errors …

   The `HpackError` type is an instance of `Eq`. Consequently, its data constructors involve only values of types that are instances of `Eq`.
   
   The `renderHpackError :: ProgramName -> HpackError -> String` function preserves the existing error messages of all existing Hpack errors.
   
   Moves `ProgramName` from `Hpack.Config` to new module `Hpack.Error` because `renderHpackError` makes use of the type.
   
   Defines, and applies, `hpackProgName :: ProgramName`, for convenience.
   
   The `DecodeOptions` constructor no longer needs its `decodeOptionsProgramName :: ProgramName` field (and `setProgramName` falls away). Its `decodeOptionsDecode` field is of type `FilePath -> IO (Either HpackError ([String], [Value]))`.
   
   The module "Hpack" exports new function `hpackResultWithError :: Options -> IO (Either HpackError Result)`.
   
   Updates tests accordingly. Some tests use `shouldSatisfy` rather than `shouldReturn`.
   
   Also bumps Hpack's `stack.yaml` to use lts-20.1 (GHC 9.2.5) rather than lts-15.11 (GHC 8.8.3).

   

   mpilgrem committed Nov 26, 2022
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