• Ryan Scott's avatar
    Add IsList instance for CallStack, restore Show instance for CallStack · be3d7f66
    Ryan Scott authored
    Summary:
    Ties up loose ends from D1894.
    
    GHC 7.10.2 and 7.10.3 featured a `Show` instance for `CallStack`, but since it
    was derived, it broke encapsulation. This adds a `Show` instance which displays
    the `CallStack` as if it were a `[(String, SrcLoc)]`.
    
    To ensure that the output of `Show` is technically a valid Haskell term, we
    also add a corresponding `IsList CallStack` instance.
    
    Reviewers: gridaphobe, austin, hvr, bgamari
    
    Reviewed By: gridaphobe, bgamari
    
    Subscribers: thomie
    
    Differential Revision: https://phabricator.haskell.org/D1903
    be3d7f66
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