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Herbert Valerio Riedel authored
This adds the new commands `:all-types`, `:loc-at`, `:type-at`, and `:uses` designed for editor-integration (such as Emacs' `haskell-mode`). This was originally implemented by Chris Done on https://github.com/chrisdone/ghci-ng and has been in use by Emacs' `haskell-mode` for over a year already, and closely missed the GHC 7.10 release back then. I've squashed the commits, rebased to GHC HEAD, and heavily refactored and improved the patch. Tests will be added in a separate commit. Reviewed By: bgamari Differential Revision: https://phabricator.haskell.org/D1240
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