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Improve parser error reporting in `ghc-pkg`

    • Open Issue created by Herbert Valerio Riedel @hvr

    Here's what I was confronted recently due to a broken sandbox environment:

    $ cabal info parsec
cabal: ghc-pkg: Data.Binary.Get.runGet at position 9583: demandInput: not enough bytes

    The main problem is that this message is not very helpful (other than telling that ghc-pkg wasn't able to do something). Duncan told me, that the recent binary API now provides better facilities for error reporting. That could be used to improve the UI of ghc-pkg when reporting errors.

    Trac metadata
    Trac field Value
    Version 7.8.2
    Type Task
    TypeOfFailure OtherFailure
    Priority normal
    Resolution Unresolved
    Component ghc-pkg
    Test case
    Differential revisions
    BlockedBy
    Related
    Blocking
    CC duncan
    Operating system
    Architecture
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