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Currently, Template Haskell's treatment of strictness is not enough to
cover all possible combinations of unpackedness and strictness. In
addition, it isn't equipped to deal with new features (such as
`-XStrictData`) which can change a datatype's fields' strictness during
compilation.
To address this, I replaced TH's `Strict` datatype with
`SourceUnpackedness` and `SourceStrictness` (which give the programmer a
more complete toolkit to configure a datatype field's strictness than
just `IsStrict`, `IsLazy`, and `Unpack`). I also added the ability to
reify a constructor fields' strictness post-compilation through the
`reifyConStrictness` function.
Fixes #10697.
Test Plan: ./validate
Reviewers: simonpj, goldfire, bgamari, austin
Reviewed By: goldfire, bgamari
Subscribers: thomie
Differential Revision: https://phabricator.haskell.org/D1603
GHC Trac Issues: #10697
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Until now GADTs were supported in Template Haskell by encoding them using
normal data types. This patch adds proper support for representing GADTs
in TH.
Test Plan: T10828
Reviewers: goldfire, austin, bgamari
Subscribers: thomie, mpickering
Differential Revision: https://phabricator.haskell.org/D1465
GHC Trac Issues: #10828
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