Cannot install with haskell-platform 8.2.1 about tart

[jtdaugherty]

Interesting; I don't know why that occurs, but tart builds successfully on non-HP installations of, say, GHC 8.2 and Cabal-install 2.0. I don't intend to support HP specifically, but I suspect this is spurious. Thanks for the report!

[rdavidso]

I just tried doing GHC 8.2 and cabal-install 2.0 on their own, and things still seem to be broken surrounding microlens-0.4.8.1:

cabal: Entering directory '/tmp/cabal-tmp-27671/microlens-mtl-0.1.11.0'
Configuring microlens-mtl-0.1.11.0...
Preprocessing library for microlens-mtl-0.1.11.0..
Building library for microlens-mtl-0.1.11.0..
[1 of 2] Compiling Lens.Micro.Mtl.Internal ( src/Lens/Micro/Mtl/Internal.hs, dist/build/Lens/Micro/Mtl/Internal.o )

src/Lens/Micro/Mtl/Internal.hs:70:1: error:
    Could not find module ‘Lens.Micro’
    There are files missing in the ‘microlens-0.4.8.1’ package,
    try running 'ghc-pkg check'.
    Use -v to see a list of the files searched for.
   |
70 | import Lens.Micro
   | ^^^^^^^^^^^^^^^^^

src/Lens/Micro/Mtl/Internal.hs:71:1: error:
    Could not find module ‘Lens.Micro.Internal’
    There are files missing in the ‘microlens-0.4.8.1’ package,
    try running 'ghc-pkg check'.
    Use -v to see a list of the files searched for.
   |
71 | import Lens.Micro.Internal
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
cabal: Leaving directory '/tmp/cabal-tmp-27671/microlens-mtl-0.1.11.0'

[jtdaugherty]

Interesting - I am able to build both microlens-0.4.8.1 and microlens-mtl-0.1.11.0 without that error. Do you get different results if you rm -r ~/.cabal/store/ghc-8.2.1?