fix non-GHCJS compilation

[peterbecich]

With GHC 8.6.5 this succeeds locally for me:

% cabal build all
Up to date

[cdsmith]

This should really go in the cabal file (presumably in codeworld-api/codeworld-api.cabal) rather than here. To be honest, I'm a little surprised that there's a cabal.project file checked in. That seems wrong...

[peterbecich]

Good idea; moved to funblocks-client.cabal.

Regarding the cabal.project file, I know the primary way to build CodeWorld is with the scripts provided; needed for GHC patches, etc. IMO the cabal.project file is useful nonetheless. For one, I'm trying to get the whole project building with Nix #1523 and cabal.project is needed for that (if using https://github.com/input-output-hk/haskell.nix).

[peterbecich]

I don't think this can go anywhere else, because it is a transient dependency.

haskell-src-meta is only used directly by codeworld-available-pkgs, which is not in this cabal.project file.

[peterbecich]

I think reflex fails to build with haskell-src-meta-0.8.8, but only as a dependency of CodeWorld. I can't reproduce the error in reflex by itself.

The transitive dependency is here
https://github.com/peterbecich/reflex/blob/823afd9424234cbe0134051f09a6710e54509cec/reflex.cabal#L183-L189

cabal build all --flags="use-template-haskell"

succeeds with haskell-src-meta-0.8.8.

[cdsmith]

Okay, I'll try to reproduce the failure and understand what's going on. If this is the case, though, I still think the constraint should be added in codeworld-api.cabal By adding it in cabal.project, you make builds initially appear to succeed, but then the codeworld-api that gets deployed to hackage may still fail to build for actual users. Honestly, I'd rather know that it's broken than make it appear to work in development and then break when deployed.

[peterbecich]

Here is the error with haskell-src-meta-0.8.8:

src/Language/Haskell/Meta/Syntax/Translate.hs:493:19: error:
    Not in scope: data constructor ‘Exts.DerivVia’
    Perhaps you meant ‘Exts.Deriving’ (imported from Language.Haskell.Exts.Syntax)
    Module ‘Language.Haskell.Exts.Syntax’ does not export ‘DerivVia’.
    |
493 | toDerivStrategy d@Exts.DerivVia{}      = noTHyet "toDerivStrategy" "2.14" d
    |                   ^^^^^^^^^^^^^
cabal: Failed to build haskell-src-meta-0.8.8 (which is required by
test:unit-tests from codeworld-api-0.7.0, exe:codeworld-game-bot from
codeworld-game-server-0.1 and others). See the build log above for details.

[peterbecich]

I think this will solve it: haskell-party/haskell-src-meta#32