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Cabal Status Command Specification

Describes how we expect the command cabal status to behave from a high-level perspective.

CompilerInfo

> cabal status --output-format=json --compiler | jq
{
  "cabal-version": "3.7.0.0",

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{-# LANGUAGE TemplateHaskell #-}

module A (template) where

import Language.Haskell.TH

template :: DecsQ
template = do
    consA <- newName "A"
    consA' <- newName "A"

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GSoC Submission

The goal of my Google Summer of Code project was to introduce support of multiple home units for GHC. The main motivation for this proposal is to help IDEs provide a seamless developer experience. Currently, two of the bigger IDE projects in Haskell are ghcide and Haskell IDE Engine. Both of these projects aim to support a workflow where developers can work on multiple packages, such as a package's library and executable at the same time. The work-force behind it is GHC itself, which is responsible for actually compiling a user's source files. While we succeeded to create a fork that implements the proposal, nothing has been merged into upstream yet. This is to be expected, since it is a huge change that will impact a considerable number of the GHC API's consumers. Therefore this feature needs to be designed with care and code changes verified to have no unintended sid

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GHC/Foo.hs:6:12: error:
    • Overlapping instances for MyEq Bool arising from a use of ‘==’
      Matching instances:
        instance MyEq Bool -- Defined in ‘GHC.Base’
        instance MyEq Bool -- Defined in ‘GHC.Base’
    • In the expression: True == True
      In an equation for ‘foo’: foo = True == True

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app/Main.hs:3:1: error:
    Bad interface file: /home/baldr/Documents/haskell/fprog/dist-newstyle/build/x86_64-linux/ghc-8.11.0.20200817/fprog-0.1.0.0/build/Paths_fprog.hi
        /home/baldr/Documents/haskell/fprog/dist-newstyle/build/x86_64-linux/ghc-8.11.0.20200817/fprog-0.1.0.0/build/Paths_fprog.hi: openBinaryFile: does not exist (No such file or directory)
  |
3 | import Paths_fprog
  | ^^^^^^^^^^^^^^^^^^
Failed, 

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     simple-bios-shell:                             OK (0.55s)

      Finding Cradle for: C:\Users\runneradmin\AppData\Local\Temp\hie-bios-test-bd77a1b14cf6e038\B.hs
      Loading Cradle: Just "C:\\Users\\runneradmin\\AppData\\Local\\Temp\\hie-bios-test-bd77a1b14cf6e038\\hie.yaml"
      Get runtime GHC library directory                              (0.06s)
      Get runtime GHC version                                        (0.03s)
      Initialise Flags                                               (0.16s)
      Initial module load
      comp opts: ComponentOptions {componentOptions = [], componentRoot = "C:\\Users\\runneradmin\\AppData\\Local\\Temp\\hie-bios-test-bd77a1b14cf6e038", componentDependencies = []} (0.24s)
      (1,2)                                                          (0.05s)

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 ghcide: Couldn't find a target code interpreter. Try with -fexternal-interpreter

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    let
        workRun :: (IO ([()], [IO ()]) ->  IO ([()], [IO ()])) -> IO (IO ())
        workRun restore = do
          let systemActs' = pumpAction : map getAction systemActs
          res <- try @SomeException
                 (restore $ (shakeRunDatabase shakeDb systemActs' :: IO ([()], [IO ()])))
          let res' = case res of
                      Left e -> "exception: " <> displayException e
                      Right _ -> "completed"
              -- Wrap up in a thread to avoid calling interruptible

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esolving dependencies...
Build profile: -w ghc-8.11.0.20200810 -O1
In order, the following will be built (use -v for more details):
 - comonad-5.0.6 (lib:comonad) (requires build)
 - ghc-api-compat-8.6 (lib) (first run)
 - bifunctors-5.5.7 (lib) (requires build)
 - ghc-check-0.5.0.1 (lib) (first run)
 - semigroupoids-5.3.4 (lib:semigroupoids) (requires build)
 - profunctors-5.5.2 (lib) (requires build)
 - assoc-1.0.2 (lib) (requires build)

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includes/stg/MiscClosures.h:378:14: error:
     note: previous declaration of ‘stg_copyArray_barrier’ was here
      378 | RTS_FUN_DECL(stg_copyArray_barrier);
          |              ^~~~~~~~~~~~~~~~~~~~~
    |
378 | RTS_FUN_DECL(stg_copyArray_barrier);
    |              ^

includes/stg/MiscClosures.h:35:61: error:
     note: in definition of macro ‘RTS_FUN_DECL’