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Cabal's parser has been rewritten in terms of Parsec (which is not
enabled yet in Cabal-2.0 by default, but can be enabled by a cabal
flag). The plan for Cabal is to drop support for the non-parsec parser,
so we need to prepare GHC to cope with new situation.
However, this means that lib:Cabal requires three new library
dependency submodules,
- parsec
- text
- mtl
What complicates matters is that we need to build `ghc-cabal` early on
during the bootstrap phase which currently needs to invoke `ghc --make`
directly. So these additional dependencies need to be integrated into
the monolithic `ghc --make` invocation which produces the `ghc-cabal`
executable.
Test Plan: `./validate --fast` passed
Reviewers: austin, bgamari
Subscribers: erikd, phadej, rwbarton, thomie
Differential Revision: https://phabricator.haskell.org/D3757
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