I followed the instructions here http://www.euterpea.com for installing Euterpea (a domain-specific language for computer music applications embedded in Haskell), and I received a message that certain packages and things failed to install (see the code below). How can I install the remaining packages?
Mo-MacBook-Pro:~ Mo$ cabal update
Downloading the latest package list from hackage.haskell.org
cabal install Euterpea
To revert to previous state run:
cabal update --index-state='2018-06-25T08:34:14Z'
Mo-MacBook-Pro:~ Mo$ cabal install Euterpea
clang: warning: argument unused during compilation: '-nopie' [-Wunused-
command-line-argument]
Resolving dependencies...
Downloading heap-1.0.4...
Downloading PortMidi-0.1.6.1...
Configuring PortMidi-0.1.6.1...
Downloading lazysmallcheck-0.6...
Configuring heap-1.0.4...
Downloading semigroups-0.18.5...
Configuring lazysmallcheck-0.6...
Configuring semigroups-0.18.5...
Building heap-1.0.4...
Building PortMidi-0.1.6.1...
Building lazysmallcheck-0.6...
Building semigroups-0.18.5...
Installed semigroups-0.18.5
Downloading stm-2.5.0.0...
Configuring stm-2.5.0.0...
Installed lazysmallcheck-0.6
Downloading HCodecs-0.5.1...
Installed heap-1.0.4
Downloading Stream-0.4.7.2...
Configuring HCodecs-0.5.1...
Configuring Stream-0.4.7.2...
Building stm-2.5.0.0...
Building HCodecs-0.5.1...
Building Stream-0.4.7.2...
Failed to install HCodecs-0.5.1
Build log ( /Users/Mo/.cabal/logs/ghc-8.4.3/HCodecs-0.5.1-
BtnY8oBJJ5FGnsoQaqbvOm.log ):
cabal: Entering directory
'/var/folders/dy/q51p3v595kbd8_wclmt80v700000gn/T/cabal-tmp-
5294/HCodecs-0.5.1'
Configuring HCodecs-0.5.1...
clang: warning: argument unused during compilation: '-nopie' [-Wunused-
command-line-argument]
Preprocessing library for HCodecs-0.5.1..
Building library for HCodecs-0.5.1..
<command line>: cannot satisfy -package-id random-1.1-
7T1TXpwb46H1j0av1OnVaD
(use -v for more information)
cabal: Leaving directory
'/var/folders/dy/q51p3v595kbd8_wclmt80v700000gn/T/cabal-tmp-
5294/HCodecs-0.5.1'
Failed to install Stream-0.4.7.2
Build log ( /Users/Mo/.cabal/logs/ghc-8.4.3/Stream-0.4.7.2-
ES6rey5IgWg9tsXDghlP7Y.log ):
cabal: Entering directory
'/var/folders/dy/q51p3v595kbd8_wclmt80v700000gn/T/cabal-tmp-
5295/Stream-0.4.7.2'
Warning: Stream.cabal:6:4: Tabs used as indentation at 6:4, 12:4, 13:4,
14:4,
15:4, 16:4, 17:4
Configuring Stream-0.4.7.2...
clang: warning: argument unused during compilation: '-nopie' [-Wunused-
command-line-argument]
Preprocessing library for Stream-0.4.7.2..
Building library for Stream-0.4.7.2..
<command line>: cannot satisfy -package-id QuickCheck-2.11.3-
4Q6LQ7mN6Tj8otrLuHN0se
(use -v for more information)
cabal: Leaving directory
'/var/folders/dy/q51p3v595kbd8_wclmt80v700000gn/T/cabal-tmp-
5295/Stream-0.4.7.2'
Installed PortMidi-0.1.6.1
Installed stm-2.5.0.0
cabal: Error: some packages failed to install:
Euterpea-2.0.6-LLo28S848YneLemh6QUkK depends on Euterpea-2.0.6 which
failed to
install.
HCodecs-0.5.1-BtnY8oBJJ5FGnsoQaqbvOm failed during the building phase.
The
exception was:
ExitFailure 1
Stream-0.4.7.2-ES6rey5IgWg9tsXDghlP7Y failed during the building phase.
The
exception was:
ExitFailure 1
arrows-0.4.4.2-GLke2GgDEro6Tzj3MGmTOB depends on arrows-0.4.4.2 which
failed
to install.
It would be great if someone could help. Thanks.
I have included all the code, lest some particular relevant detail was omitted.
Edit
I have also tried to install Euterpea via stack. I get this message:
Mo-MacBook-Pro:~ Mo$ stack install Euterpea
Error: While constructing the build plan, the following exceptions were
encountered:
In the dependencies for Euterpea-2.0.6:
PortMidi must match ==0.1.6.1, but the stack configuration has no specified version (latest matching version is 0.1.6.1)
arrows must match >=0.4 && <0.5, but the stack configuration has no specified version (latest matching version is 0.4.4.2)
needed since Euterpea is a build target.
Some different approaches to resolving this:
* Consider trying 'stack solver', which uses the cabal-install solver to attempt to find some working build configuration. This can be convenient when dealing with many complicated constraint
errors, but results may be unpredictable.
* Recommended action: try adding the following to your extra-deps in /Users/Mo/.stack/global-project/stack.yaml:
- PortMidi-0.1.6.1
- arrows-0.4.4.2
Plan construction failed.
--
Edit 2.
As suggested below, I tried cabal install random-1.1 --force-reinstalls which generated:
clang: warning: argument unused during compilation: '-nopie' [- Wunused-command-line-argument]
Resolving dependencies...
Warning: The following packages are likely to be broken by the reinstalls:
tf-random-0.5
QuickCheck-2.11.3
Continuing even though the plan contains dangerous reinstalls.
Configuring random-1.1...
Building random-1.1...
Installed random-1.1
Then
Mo-MacBook-Pro:~ Mo$ cabal install Euterpea
clang: warning: argument unused during compilation: '-nopie' [- Wunused-command-line-argument]
Resolving dependencies...
Configuring Stream-0.4.7.2...
Configuring HCodecs-0.5.1...
Building HCodecs-0.5.1...
Building Stream-0.4.7.2...
Failed to install HCodecs-0.5.1
Build log ( /Users/lukeburke/.cabal/logs/ghc-8.4.3/HCodecs-0.5.1- BtnY8oBJJ5FGnsoQaqbvOm.log ):
cabal: Entering directory '/var/folders/dy/q51p3v595kbd8_wclmt80v700000gn/T/cabal-tmp-20742/HCodecs- 0.5.1'
Configuring HCodecs-0.5.1...
clang: warning: argument unused during compilation: '-nopie' [- Wunused-command-line-argument]
Preprocessing library for HCodecs-0.5.1..
Building library for HCodecs-0.5.1..
<command line>: cannot satisfy -package-id random-1.1- 7T1TXpwb46H1j0av1OnVaD
(use -v for more information)
cabal: Leaving directory '/var/folders/dy/q51p3v595kbd8_wclmt80v700000gn/T/cabal-tmp-20742/HCodecs- 0.5.1'
Failed to install Stream-0.4.7.2
Build log ( /Users/Mo/.cabal/logs/ghc-8.4.3/Stream-0.4.7.2- ES6rey5IgWg9tsXDghlP7Y.log ):
cabal: Entering directory '/var/folders/dy/q51p3v595kbd8_wclmt80v700000gn/T/cabal-tmp-20743/Stream- 0.4.7.2'
Warning: Stream.cabal:6:4: Tabs used as indentation at 6:4, 12:4, 13:4, 14:4,
15:4, 16:4, 17:4
Configuring Stream-0.4.7.2...
clang: warning: argument unused during compilation: '-nopie' [- Wunused-command-line-argument]
Preprocessing library for Stream-0.4.7.2..
Building library for Stream-0.4.7.2..
<command line>: cannot satisfy -package-id QuickCheck-2.11.3- 4Q6LQ7mN6Tj8otrLuHN0se
(use -v for more information)
cabal: Leaving directory '/var/folders/dy/q51p3v595kbd8_wclmt80v700000gn/T/cabal-tmp-20743/Stream- 0.4.7.2'
cabal: Error: some packages failed to install:
Euterpea-2.0.6-LLo28S848YneLemh6QUkK depends on Euterpea-2.0.6 which failed to
install.
HCodecs-0.5.1-BtnY8oBJJ5FGnsoQaqbvOm failed during the building phase. The
exception was:
ExitFailure 1
Stream-0.4.7.2-ES6rey5IgWg9tsXDghlP7Y failed during the building phase. The
exception was:
ExitFailure 1
arrows-0.4.4.2-GLke2GgDEro6Tzj3MGmTOB depends on arrows-0.4.4.2 which failed
to install.
Edit 3
It has been suggested below that multiple packages are botched and that I should try re-installing all of them (in a single command, i.e. cabal install random tf-random QuickCheck Euterpea --force-reinstalls.
However, if I write cabal install random tf-random QuickCheck Euterpea --force-reinstalls I receive the following code:
clang: warning: argument unused during compilation: '-nopie' [- Wunused-command-line-argument]
Resolving dependencies...
Warning: The following packages are likely to be broken by the reinstalls:
QuickCheck-2.11.3
Continuing even though the plan contains dangerous reinstalls.
Downloading erf-2.0.0.0...
Configuring random-1.1...
Configuring erf-2.0.0.0...
Building random-1.1...
Building erf-2.0.0.0...
Installed erf-2.0.0.0
Installed random-1.1
Downloading tf-random-0.5...
Configuring tf-random-0.5...
Building tf-random-0.5...
Failed to install tf-random-0.5
Build log ( /Users/Mo/.cabal/logs/ghc-8.4.3/tf-random-0.5- ADZoyzEXgHe6hyR0Bycce0.log ):
cabal: Entering directory '/var/folders/dy/q51p3v595kbd8_wclmt80v700000gn/T/cabal-tmp-21584/tf- random-0.5'
Configuring tf-random-0.5...
clang: warning: argument unused during compilation: '-nopie' [- Wunused-command-line-argument]
Preprocessing library for tf-random-0.5..
Building library for tf-random-0.5..
<command line>: cannot satisfy -package-id primitive-0.6.4.0- 9k41Y6ToOAE8KXK6VMGV2O
(use -v for more information)
cabal: Leaving directory '/var/folders/dy/q51p3v595kbd8_wclmt80v700000gn/T/cabal-tmp-21584/tf- random-0.5'
cabal: Error: some packages failed to install:
Euterpea-2.0.6-87WYqltNL8w8teqXOsc4TL depends on Euterpea-2.0.6 which failed
to install.
HCodecs-0.5.1-DrGKEnNk6EBHti2goL6KP5 depends on HCodecs-0.5.1 which. failed to
install.
QuickCheck-2.12.6.1-KuXpgimNOXzF2SmGPEs5LR depends on QuickCheck- 2.12.6.1
which failed to install.
Stream-0.4.7.2-FedzVSwUnWMDxlzmPNWt7x depends on Stream-0.4.7.2 which failed
to install.
arrows-0.4.4.2-EGvZPpby4BcD99TcXDoCg4 depends on arrows-0.4.4.2 which. failed
to install.
tf-random-0.5-ADZoyzEXgHe6hyR0Bycce0 failed during the building phase. The
exception was:
ExitFailure 1
What can I do to install Euterpea?
Installing the Euterpea package
This answer uses LTS 12.26 as I've verified it works, but this should work for most LTS releases (see bottom of step 2 for details).
Make a new Stack project:
stack new euter-test
cd euter-test
Edit stack.yaml and set the LTS to 12.26 and extra-deps to specify the versions of packages that aren't present in the LTS but are present on Hackage:
resolver: lts-12.26
...
extra-deps:
- Euterpea-2.0.6
- PortMidi-0.1.6.1
- arrows-0.4.4.2
- Stream-0.4.7.2
- lazysmallcheck-0.6
The errors you were getting on the Stack install ("PortMidi must match ==0.1.6.1, but the stack configuration has no specified version") indicate that a package you're using requires a particular version of a library, but the package repository (LTS snapshot) doesn't contain that library, so you need to specify it explicitly. Stack then prints which library and version is missing, so you can just keep trying stack build and adding the libraries until the build succeeds.
We use LTS 12.26 here, but by adding the extra-deps packages as described above, you should be able to get it working on any LTS.
Edit package.yaml and add Euterpea to the list of dependencies:
dependencies:
...
- Euterpea
A simple test in app/Main.hs:
module Main where
import Euterpea
main :: IO ()
main = play $ c 4 qn
Run stack build:
lazysmallcheck-0.6: download
heap-1.0.4: download
heap-1.0.4: configure
HCodecs-0.5.1: download
PortMidi-0.1.6.1: download
heap-1.0.4: build
lazysmallcheck-0.6: configure
lazysmallcheck-0.6: build
HCodecs-0.5.1: configure
HCodecs-0.5.1: build
PortMidi-0.1.6.1: configure
heap-1.0.4: copy/register
lazysmallcheck-0.6: copy/register
PortMidi-0.1.6.1: build
Stream-0.4.7.2: download
Stream-0.4.7.2: configure
Stream-0.4.7.2: build
Stream-0.4.7.2: copy/register
PortMidi-0.1.6.1: copy/register
arrows-0.4.4.2: download
arrows-0.4.4.2: configure
arrows-0.4.4.2: build
arrows-0.4.4.2: copy/register
HCodecs-0.5.1: copy/register
Euterpea-2.0.6: download
Euterpea-2.0.6: configure
Euterpea-2.0.6: build
Euterpea-2.0.6: copy/register
Building all executables for `euter' once. After a successful build of all of them, only specified executables will be rebuilt.
euter-0.1.0.0: configure (lib + exe)
Configuring euter-0.1.0.0...
euter-0.1.0.0: build (lib + exe)
Preprocessing library for euter-0.1.0.0..
Building library for euter-0.1.0.0..
[1 of 2] Compiling Lib ( src/Lib.hs, .stack-work/dist/x86_64-linux/Cabal-2.2.0.1/build/Lib.o )
[2 of 2] Compiling Paths_euter ( .stack-work/dist/x86_64-linux/Cabal-2.2.0.1/build/autogen/Paths_euter.hs, .stack-work/dist/x86_64-linux/Cabal-2.2.0.1/build/Paths_euter.o )
Preprocessing executable 'euter-exe' for euter-0.1.0.0..
Building executable 'euter-exe' for euter-0.1.0.0..
[1 of 2] Compiling Main ( app/Main.hs, .stack-work/dist/x86_64-linux/Cabal-2.2.0.1/build/euter-exe/euter-exe-tmp/Main.o )
[2 of 2] Compiling Paths_euter ( .stack-work/dist/x86_64-linux/Cabal-2.2.0.1/build/euter-exe/autogen/Paths_euter.hs, .stack-work/dist/x86_64-linux/Cabal-2.2.0.1/build/euter-exe/euter-exe-tmp/Paths_euter.o )
Linking .stack-work/dist/x86_64-linux/Cabal-2.2.0.1/build/euter-exe/euter-exe ...
euter-0.1.0.0: copy/register
Installing library in <...>
Installing executable euter-exe in <...>
Registering library for euter-0.1.0.0..
Running the executable produced by the project should emit a tone if you're running a MIDI synthesiser:
stack exec euter-test-exe
Troubleshooting
If you get an error like *** Exception: No MIDI outputs!, then you're not running a MIDI synthesiser (see below). Make sure you run it in the background (eg. in another terminal).
If you don't get an error but there's no audio output, try running devices in GHCI to see what outputs are available, and then use playDev x instead of play, where x is the OutputDeviceID of the synth input port. Eg:
> devices
Input devices:
InputDeviceID 1 Midi Through Port-0
Output devices:
OutputDeviceID 0 Midi Through Port-0
OutputDeviceID 2 Synth input port (25952:0)
> playDev 2 $ c 4 qn
If you run devices and don't see any synth input ports, but you have fluidsynth running in the background, then you might need to restart ghci and try again.
Running a MIDI synthesiser
Here's a quick step-by-step to get Fluidsynth running on Debian (with guesses at a Mac setup along the way).
Install fluidsynth:
On Debian this is sudo apt install fluidsynth, on mac it could be brew install fluidsynth - there's quite a few articles on how to do this, just google it if in doubt.
Run fluidsynth:
On Debian using ALSA this is
fluidsynth -s -a alsa -m alsa_seq /usr/share/sounds/sf2/FluidR3_GM.sf2
Instructing fluidsynth to run in server mode, use alsa as the audio driver and alsa_seq as the MIDI driver, and use the soundfont FluidR3_GM.sf2 (should be installed as part of the fluidsynth install).
On Mac, it seems like the correct commandline is:
fluidsynth -s -a coreaudio -m coremidi /usr/share/sounds/sf2/FluidR3_GM.sf2
If you can't find the FluidR3_GM.sf2 file then it's likely it's been installed in a different location. As a last resort, you can just download a soundfont file and use that rather than the one provided by FluidSynth.
After running this, you should be given a prompt and maybe a few warnings, and fluidsynth will be running. Make sure it's running before using Euterpea, and keep it running while using Euterpea.
I've had nothing but trouble using cabal, not sure if it's due to a lack of understanding, or a faulty mental model, but things have been tough.
At the moment I'm just trying to get ghc-mod to work for my vim plugins. It usually works for a day or two and then starts failing for seemingly no reason with an error, the error I receive seems to change from time to time, right now I'm getting this one:
$ ghc-mod check Main.hs
ghc-mod: /Users/chris/.stack/snapshots/x86_64-osx/lts-6.15/7.10.3/pkgdb/package.cache:
GHC.PackageDb.readPackageDb: inappropriate type (Not a valid Unicode code point!)
Any ideas about how to fix this sort of thing? I've tried installing it again, but I get this (I think my cabal packages are all screwed up but don't know how to fix it):
$ cabal install ghc-mod
Resolving dependencies...
Downloading haskell-src-exts-1.17.1...
Configuring haskell-src-exts-1.17.1...
Failed to install haskell-src-exts-1.17.1
Build log ( /Users/chris/.cabal/logs/haskell-src-exts-1.17.1.log ):
cabal: Entering directory '/var/folders/6l/rdh2g5wn41s8vxchngkt02_c0000gn/T/cabal-tmp-45583/haskell-src-exts-1.17.1'
Configuring haskell-src-exts-1.17.1...
cabal: The program 'happy' version >=1.19 is required but it could not be
found.
cabal: Leaving directory '/var/folders/6l/rdh2g5wn41s8vxchngkt02_c0000gn/T/cabal-tmp-45583/haskell-src-exts-1.17.1'
cabal: Error: some packages failed to install:
ghc-mod-5.6.0.0 depends on haskell-src-exts-1.17.1 which failed to install.
haskell-src-exts-1.17.1 failed during the configure step. The exception was:
ExitFailure 1
hlint-1.9.35 depends on haskell-src-exts-1.17.1 which failed to install.
Edit:
Looked away for a second and tried again, now I'm getting this error, getting kinda sick of cabal changing its mind all the time:
$ ghc-mod check Main.hs
[1 of 5] Compiling CabalHelper.Common ( CabalHelper/Common.hs, /Users/chris/.ghc-mod/cabal-helper/CabalHelper/Common.o )
[2 of 5] Compiling CabalHelper.Licenses ( CabalHelper/Licenses.hs, /Users/chris/.ghc-mod/cabal-helper/CabalHelper/Licenses.o )
CabalHelper/Licenses.hs:53:18: error:
Ambiguous occurrence ‘lookupInstalledPackageId’
It could refer to either ‘Distribution.Simple.PackageIndex.lookupInstalledPackageId’,
imported from ‘Distribution.Simple.PackageIndex’ at CabalHelper/Licenses.hs:24:1-39
or ‘CabalHelper.Licenses.lookupInstalledPackageId’,
defined at CabalHelper/Licenses.hs:38:1
CabalHelper/Licenses.hs:74:10: error:
Ambiguous occurrence ‘lookupInstalledPackageId’
It could refer to either ‘Distribution.Simple.PackageIndex.lookupInstalledPackageId’,
imported from ‘Distribution.Simple.PackageIndex’ at CabalHelper/Licenses.hs:24:1-39
or ‘CabalHelper.Licenses.lookupInstalledPackageId’,
defined at CabalHelper/Licenses.hs:38:1
ghc-mod: readCreateProcess: /Users/chris/.stack/snapshots/x86_64-osx/lts-6.15/7.10.3/libexec/cabal-helper-wrapper "--with-ghc=/usr/local/bin/ghc" "--with-ghc-pkg=/usr/local/bin/ghc-pkg" "--with-cabal=cabal" "/Users/chris/dev/formatter" "/Users/chris/dev/formatter/.stack-work/dist/x86_64-osx/Cabal-1.24.0.0" "package-db-stack" "entrypoints" "source-dirs" "ghc-options" "ghc-src-options" "ghc-pkg-options" "ghc-merged-pkg-options" "ghc-lang-options" "licenses" "flags" "config-flags" "non-default-config-flags" "compiler-version" (exit 1): failed
This error was caused by having a mismatch between my local stack ghc version and the global ghc-mod ghc version, I updated the ghc version in the stack project to latest and everything is working fine.
Looking around StackOverflow I see a bunch of similar problems, but each about a specific library.
Here's mine :
When trying to run :
cabal install yesod
I get
Resolving dependencies...
Configuring yaml-0.8.7...
Building yaml-0.8.7...
Preprocessing library yaml-0.8.7...
Data/Yaml/Parser.hs:15:8:
Could not find module `Data.Conduit.Lift'
Perhaps you meant
Data.Conduit.List (from conduit-1.0.8)
Data.Conduit.List (needs flag -package conduit-1.0.5.1)
Data.Conduit.Text (needs flag -package conduit-1.0.5.1)
Use -v to see a list of the files searched for.
Failed to install yaml-0.8.7
Configuring yesod-core-1.2.10...
Building yesod-core-1.2.10...
Preprocessing library yesod-core-1.2.10...
Yesod/Core/Json.hs:47:8:
Could not find module `Data.Conduit.Lift'
Perhaps you meant
Data.Conduit.List (from conduit-1.0.8)
Data.Conduit.List (needs flag -package conduit-1.0.5.1)
Data.Conduit.Text (needs flag -package conduit-1.0.5.1)
Use -v to see a list of the files searched for.
Failed to install yesod-core-1.2.10
cabal: Error: some packages failed to install:
yaml-0.8.7 failed during the building phase. The exception was:
ExitFailure 1
yesod-1.2.5.2 depends on yesod-core-1.2.10 which failed to install.
yesod-auth-1.3.0.2 depends on yesod-core-1.2.10 which failed to install.
yesod-core-1.2.10 failed during the building phase. The exception was:
ExitFailure 1
yesod-form-1.3.8.1 depends on yesod-core-1.2.10 which failed to install.
yesod-persistent-1.2.2.2 depends on yesod-core-1.2.10 which failed to install.
Is something broken in Hackage or is this just on my machine?
You're trying to install a version of yaml that doesn't have a strict enough lower bound on conduit. There is a newer version already on Hackage. It looks like you haven't run cabal update.
So i'm trying to install the llvm-3.4.2.2 haskell bindings through cabal. But it fails with the following output
Curtiss-MacBook-Air:TestImages Curtis$ sudo cabal install llvm-general
Password:
Resolving dependencies...
[1 of 1] Compiling Main ( /tmp/llvm-general-3.4.2.2-7647/llvm-general-3.4.2.2/Setup.hs, /tmp/llvm-general-3.4.2.2-7647/llvm-general-3.4.2.2/dist/setup/Main.o )
Linking /tmp/llvm-general-3.4.2.2-7647/llvm-general-3.4.2.2/dist/setup/setup ...
Configuring llvm-general-3.4.2.2...
Building llvm-general-3.4.2.2...
Preprocessing library llvm-general-3.4.2.2...
dyld: Library not loaded: /Users/ian/zz64/ghc-7.6.3/libffi/build/inst/lib/libffi.6.dylib
Referenced from: /private/tmp/llvm-general-3.4.2.2-7647/llvm-general-3.4.2.2/dist/build/LLVM/General/Internal/LibraryFunction_hsc_make
Reason: image not found
running dist/build/LLVM/General/Internal/LibraryFunction_hsc_make failed (exit code 5)
command was: dist/build/LLVM/General/Internal/LibraryFunction_hsc_make >dist/build/LLVM/General/Internal/LibraryFunction.hs
Failed to install llvm-general-3.4.2.2
cabal: Error: some packages failed to install:
llvm-general-3.4.2.2 failed during the building phase. The exception was:
ExitFailure 1
It appears to fail because someone hardcoded the path /Users/ian/zz64/ghc-7.6.3/libffi/build/inst/lib/libffi.6.dylib in LibraryFunction_hsc_make. I've found people who have run into similar problems with this path but no viable solutions to my problem
I am using Windows 7 with locale zh_CN and ghc-7.0.4
Default code page of the cmd.exe is 936.
> cabal install ghc-mod
Resolving dependencies...
Configuring ghc-syb-utils-0.2.1.0...
Preprocessing library ghc-syb-utils-0.2.1.0...
Building ghc-syb-utils-0.2.1.0...
<built-in>:0:4: lexical error (UTF-8 decoding error)
cabal: Error: some packages failed to install:
ghc-mod-1.10.7 depends on ghc-syb-utils-0.2.1.0 which failed to install.
ghc-syb-utils-0.2.1.0 failed during the building phase. The exception was:
ExitFailure 1
I have tried change code page and re-install again, but get the same output.
> chcp 65001
> cabal install ghc-mod
Some packages can be built successfully:
xml-1.3.12 textmath-0.6.0.3 tagsoup-0.12.6
Some packages would fail:
temporary-1.1.2.3 utf8-string-0.3.7 pandoc-types-1.9.0.2 json-0.5
I encountered the same problem.
I don't know if the cause is the same, but try
set LANG=C
before you run cabal. In my case, that fixed the problem.