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This patch allows define and re-define functions in ghci. `let` is not required anymore (but can be used). Idea: If ghci input string can be parsed as statement then run it as statement else run it as declaration. Reviewers: mpickering, bgamari, austin Reviewed By: mpickering, bgamari, austin Subscribers: hvr, mpickering, dterei, thomie Differential Revision: https://phabricator.haskell.org/D1299 GHC Trac Issues: #7253
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