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authorRyan Scott <ryan.gl.scott@gmail.com>2017-11-02 11:52:50 -0400
committerBen Gamari <ben@smart-cactus.org>2017-11-02 11:56:26 -0400
commit1317ba625d40fbd51cb0538b3fde28f412f30c01 (patch)
tree6f891bba014ae2fc3e9a94c6ecdfabb021a0bbf2 /compiler/nativeGen/PPC/CodeGen.hs
parent29ae83374647e227d76acd896b89590fc15590d6 (diff)
downloadhaskell-1317ba625d40fbd51cb0538b3fde28f412f30c01.tar.gz
Implement the EmptyDataDeriving proposal
This implements the `EmptyDataDeriving` proposal put forth in https://github.com/ghc-proposals/ghc-proposals/blob/dbf51608/proposals/0006-deriving-empty.rst. This has two major changes: * The introduction of an `EmptyDataDeriving` extension, which permits directly deriving `Eq`, `Ord`, `Read`, and `Show` instances for empty data types. * An overhaul in the code that is emitted in derived instances for empty data types. To see an overview of the changes brought forth, refer to the changes to the 8.4.1 release notes. Test Plan: ./validate Reviewers: bgamari, dfeuer, austin, hvr, goldfire Reviewed By: bgamari Subscribers: rwbarton, thomie GHC Trac Issues: #7401, #10577, #13117 Differential Revision: https://phabricator.haskell.org/D4047
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