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/D1903be3d7f66
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