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Commit 1aa1d405 authored by Alan Zimmerman's avatar Alan Zimmerman
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Restore Trees That Grow reverted commits

The following commits were reverted prior to the release of GHC 8.4.1,
because the time to derive Data instances was too long [1].

 438dd1cb Phab:D4147
 e3ec2e7a Phab:D4177
 47ad6578 Phab:D4186

The work is continuing, as the minimum bootstrap compiler is now
GHC 8.2.1, and this allows Plan B[2] for instances to be used.  This
will land in a following commit.

Updates Haddock submodule

[1] https://ghc.haskell.org/trac/ghc/wiki/ImplementingTreesThatGrow/Instances
[2] https://ghc.haskell.org/trac/ghc/wiki/ImplementingTreesThatGrow/Instances#PLANB
parent 48f55e76
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