Haskell: Development Environment Setup¶
| haskell |
- References
- Lesson 1 - Getting set up
- 1. Install Stack
- 2. Add Haskell stack to
PATH - 3. Create project from
Stacktemplate - 4. Install VSCode Haskell extention
- 5. Initial project’s build
- 6. Update the app and rebuild
- 7. Install
ghcid - 8. Add a “hole” to our module and check how
ghcidworks - 9. Play with
Stackrepl - 10. VSCode: Switch focus between editor and integrated terminal
- 11. VSCode adjust layout
References¶
- These notes are based on Youtube playlist Learning Haskell for dummies by Cmdv aka Vincent Orr
- The Haskell Tool Stack - Stack is a cross-platform program for developing Haskell projects. It is aimed at Haskellers both new and experienced.
- Hoogle is a Haskell API search engine, which allows you to search the Haskell libraries on Stackage by either function name, or by approximate type signature.
- Stackage provides consistent sets of Haskell packages, known to build together and pass their tests before becoming Stackage Nightly snapshots and LTS (Long Term Support) releases.
- Github ghcid - Very low feature GHCi based IDE. Either “GHCi as a daemon” or “GHC + a bit of an IDE”. To a first approximation, it opens
ghciand runs:reloadwhenever your source code changes, formatting the output to fit a fixed height console.
Lesson 1 - Getting set up¶
1. Install Stack¶
Run: curl -sSL https://get.haskellstack.org/ | sh
Log:
$ curl -sSL https://get.haskellstack.org/ | sh
Using generic bindist...
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 138 100 138 0 0 237 0 --:--:-- --:--:-- --:--:-- 237
100 635 100 635 0 0 495 0 0:00:01 0:00:01 --:--:-- 620k
100 8462k 100 8462k 0 0 3209k 0 0:00:02 0:00:02 --:--:-- 12.1M
Installing Stack to: /usr/local/bin/stack...
-------------------------------------------------------------------------------
Stack has been installed to: /usr/local/bin/stack
NOTE: You may need to run 'xcode-select --install' and/or
'open /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg'
to set up the Xcode command-line tools, which Stack uses.
WARNING: '/Users/oivasiv/.local/bin' is not on your PATH.
Stack will place the binaries it builds in '/Users/oivasiv/.local/bin' so
for best results, please add it to the beginning of PATH in your profile.
2. Add Haskell stack to PATH¶
# Haskell Stack will place the binaries it builds in '/Users/$USER/.local/bin' so
# for best results, please add it to the beginning of PATH in your profile.
export PATH="/Users/oivasiv/.local/bin:$PATH"
3. Create project from Stack template¶
Run: stack new haskell-first-prj
Log:
$ stack new haskell-first-prj
Downloading template "new-template" to create project "haskell-first-prj" in haskell-first-prj/ ...
The following parameters were needed by the template but not provided: author-name
You can provide them in /Users/oivasiv/.stack/config.yaml, like this:
templates:
params:
author-name: value
Or you can pass each one as parameters like this:
stack new haskell-first-prj new-template -p "author-name:value"
The following parameters were needed by the template but not provided: author-email, author-name, category, copyright, github-username
You can provide them in /Users/oivasiv/.stack/config.yaml, like this:
templates:
params:
author-email: value
author-name: value
category: value
copyright: value
github-username: value
Or you can pass each one as parameters like this:
stack new haskell-first-prj new-template -p "author-email:value" -p "author-name:value" -p "category:value" -p "copyright:value" -p "github-username:value"
Looking for .cabal or package.yaml files to use to init the project.
Using cabal packages:
- haskell-first-prj/
Selecting the best among 19 snapshots...
* Matches https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/17/11.yaml
Selected resolver: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/17/11.yaml
Initialising configuration using resolver: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/17/11.yaml
Total number of user packages considered: 1
Writing configuration to file: haskell-first-prj/stack.yaml
All done.
/Users/oivasiv/.stack/templates/new-template.hsfiles: 6.06 KiB downloaded...
Resulted project layout
$ tree .
.
├── ChangeLog.md
├── LICENSE
├── README.md
├── Setup.hs
├── app
│ └── Main.hs
├── haskell-first-prj.cabal
├── package.yaml
├── src
│ └── Lib.hs
├── stack.yaml
├── stack.yaml.lock
└── test
└── Spec.hs
4. Install VSCode Haskell extention¶
See Haskell Syntax Highlighting Support for the Haskell programming language in Visual Studio Code.
5. Initial project’s build¶
Run: stack build
Log:
$ stack build
Preparing to install GHC to an isolated location.
This will not interfere with any system-level installation.
Downloaded ghc-8.10.4.
xcode-select: error: tool 'xcodebuild' requires Xcode, but active developer directory '/Library/Developer/CommandLineTools' is a command line tools instance
ld: unknown option: --version
ld: unknown option: --version
Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/c++/4.2.1
Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/c++/4.2.1
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts.a(Disassembler.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts.a(LdvProfile.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts.a(OldARMAtomic.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts.a(ProfilerReport.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts.a(ProfilerReportJson.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts.a(Profiling.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts.a(RetainerProfile.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts.a(RetainerSet.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts.a(RtsDllMain.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts.a(SpinLock.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts.a(TraverseHeap.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts.a(Evac_thr.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts.a(Sanity.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts.a(Scav_thr.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts.a(Elf.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts.a(PEi386.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts.a(elf_got.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts.a(elf_plt.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts.a(elf_plt_aarch64.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts.a(elf_plt_arm.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts.a(elf_reloc.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts.a(elf_reloc_aarch64.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts.a(elf_util.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_p.a(Disassembler.p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_p.a(OldARMAtomic.p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_p.a(RtsDllMain.p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_p.a(SpinLock.p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_p.a(Evac_thr.p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_p.a(Sanity.p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_p.a(Scav_thr.p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_p.a(Elf.p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_p.a(PEi386.p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_p.a(elf_got.p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_p.a(elf_plt.p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_p.a(elf_plt_aarch64.p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_p.a(elf_plt_arm.p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_p.a(elf_reloc.p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_p.a(elf_reloc_aarch64.p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_p.a(elf_util.p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_l.a(Disassembler.l_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_l.a(LdvProfile.l_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_l.a(OldARMAtomic.l_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_l.a(ProfilerReport.l_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_l.a(ProfilerReportJson.l_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_l.a(Profiling.l_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_l.a(RetainerProfile.l_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_l.a(RetainerSet.l_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_l.a(RtsDllMain.l_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_l.a(SpinLock.l_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_l.a(TraverseHeap.l_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_l.a(Evac_thr.l_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_l.a(Sanity.l_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_l.a(Scav_thr.l_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_l.a(Elf.l_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_l.a(PEi386.l_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_l.a(elf_got.l_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_l.a(elf_plt.l_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_l.a(elf_plt_aarch64.l_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_l.a(elf_plt_arm.l_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_l.a(elf_reloc.l_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_l.a(elf_reloc_aarch64.l_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_l.a(elf_util.l_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug.a(LdvProfile.debug_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug.a(OldARMAtomic.debug_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug.a(ProfilerReport.debug_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug.a(ProfilerReportJson.debug_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug.a(Profiling.debug_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug.a(RetainerProfile.debug_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug.a(RetainerSet.debug_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug.a(RtsDllMain.debug_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug.a(SpinLock.debug_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug.a(TraverseHeap.debug_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug.a(Evac_thr.debug_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug.a(Scav_thr.debug_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug.a(Elf.debug_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug.a(PEi386.debug_o) has no symbols
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/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_thr_debug_p.a(elf_util.thr_debug_p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_thr_debug_p.a(Select.thr_debug_p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug_p.a(OldARMAtomic.debug_p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug_p.a(RtsDllMain.debug_p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug_p.a(SpinLock.debug_p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug_p.a(Evac_thr.debug_p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug_p.a(Scav_thr.debug_p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug_p.a(Elf.debug_p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug_p.a(PEi386.debug_p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug_p.a(elf_got.debug_p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug_p.a(elf_plt.debug_p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug_p.a(elf_plt_aarch64.debug_p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug_p.a(elf_plt_arm.debug_p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug_p.a(elf_reloc.debug_p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug_p.a(elf_reloc_aarch64.debug_p_o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /Users/oivasiv/.stack/programs/x86_64-osx/ghc-8.10.4/lib/ghc-8.10.4/rts/libHSrts_debug_p.a(elf_util.debug_p_o) has no symbols
Installed GHC.
[1 of 2] Compiling Main ( /Users/oivasiv/.stack/setup-exe-src/setup-mPHDZzAJ.hs, /Users/oivasiv/.stack/setup-exe-src/setup-mPHDZzAJ.o )
[2 of 2] Compiling StackSetupShim ( /Users/oivasiv/.stack/setup-exe-src/setup-shim-mPHDZzAJ.hs, /Users/oivasiv/.stack/setup-exe-src/setup-shim-mPHDZzAJ.o )
Linking /Users/oivasiv/.stack/setup-exe-cache/x86_64-osx/tmp-Cabal-simple_mPHDZzAJ_3.2.1.0_ghc-8.10.4 ...
Building all executables for `haskell-first-prj' once. After a successful build of all of them, only specified executables will be rebuilt.
haskell-first-prj> configure (lib + exe)
Configuring haskell-first-prj-0.1.0.0...
haskell-first-prj> build (lib + exe)
Preprocessing library for haskell-first-prj-0.1.0.0..
Building library for haskell-first-prj-0.1.0.0..
[1 of 2] Compiling Lib
[2 of 2] Compiling Paths_haskell_first_prj
Preprocessing executable 'haskell-first-prj-exe' for haskell-first-prj-0.1.0.0..
Building executable 'haskell-first-prj-exe' for haskell-first-prj-0.1.0.0..
[1 of 2] Compiling Main
[2 of 2] Compiling Paths_haskell_first_prj
Linking .stack-work/dist/x86_64-osx/Cabal-3.2.1.0/build/haskell-first-prj-exe/haskell-first-prj-exe ...
haskell-first-prj> copy/register
Installing library in /Users/oivasiv/Projects/haskell_prj/haskell-first-prj/.stack-work/install/x86_64-osx/5e51f2123ebe0cb8f05a0b49e4743eebc38bbceea3c01c0e46a8b4871413e296/8.10.4/lib/x86_64-osx-ghc-8.10.4/haskell-first-prj-0.1.0.0-Cwmb6rEwFEN2sOWocMM0iS
Installing executable haskell-first-prj-exe in /Users/oivasiv/Projects/haskell_prj/haskell-first-prj/.stack-work/install/x86_64-osx/5e51f2123ebe0cb8f05a0b49e4743eebc38bbceea3c01c0e46a8b4871413e296/8.10.4/bin
Registering library for haskell-first-prj-0.1.0.0..
6. Update the app and rebuild¶
update /src/Lib.hs file
$ git diff
diff --git a/src/Lib.hs b/src/Lib.hs
index d36ff27..daec72f 100644
--- a/src/Lib.hs
+++ b/src/Lib.hs
@@ -3,4 +3,4 @@ module Lib
) where
someFunc :: IO ()
-someFunc = putStrLn "someFunc"
+someFunc = putStrLn "haskell-first-prj-exe - Hello from the hell"
- build
$ stack build
haskell-first-prj-0.1.0.0: unregistering (local file changes: src/Lib.hs)
haskell-first-prj> configure (lib + exe)
Configuring haskell-first-prj-0.1.0.0...
haskell-first-prj> build (lib + exe)
Preprocessing library for haskell-first-prj-0.1.0.0..
Building library for haskell-first-prj-0.1.0.0..
[2 of 2] Compiling Lib
Preprocessing executable 'haskell-first-prj-exe' for haskell-first-prj-0.1.0.0..
Building executable 'haskell-first-prj-exe' for haskell-first-prj-0.1.0.0..
[1 of 2] Compiling Main [Lib changed]
Linking .stack-work/dist/x86_64-osx/Cabal-3.2.1.0/build/haskell-first-prj-exe/haskell-first-prj-exe ...
haskell-first-prj> copy/register
Installing library in /Users/oivasiv/Projects/haskell_prj/haskell-first-prj/.stack-work/install/x86_64-osx/5e51f2123ebe0cb8f05a0b49e4743eebc38bbceea3c01c0e46a8b4871413e296/8.10.4/lib/x86_64-osx-ghc-8.10.4/haskell-first-prj-0.1.0.0-Cwmb6rEwFEN2sOWocMM0iS
Installing executable haskell-first-prj-exe in /Users/oivasiv/Projects/haskell_prj/haskell-first-prj/.stack-work/install/x86_64-osx/5e51f2123ebe0cb8f05a0b49e4743eebc38bbceea3c01c0e46a8b4871413e296/8.10.4/bin
Registering library for haskell-first-prj-0.1.0.0..
- run
$ stack exec haskell-first-prj-exe
haskell-first-prj-exe - Hello from the hell
7. Install ghcid¶
- Github ghcid - Very low feature GHCi based IDE
Run: stack install ghcid
Log:
$ stack install ghcid
cereal > configure
cereal > Configuring cereal-0.5.8.1...
cereal > build
clock > configure
cereal > Preprocessing library for cereal-0.5.8.1..
cereal > Building library for cereal-0.5.8.1..
cereal > [1 of 4] Compiling Data.Serialize.Get
clock > Configuring clock-0.8...
clock > build
cmdargs > configure
clock > Preprocessing library for clock-0.8..
clock > Building library for clock-0.8..
clock > [1 of 1] Compiling System.Clock
cmdargs > Configuring cmdargs-0.10.21...
cmdargs > build
colour > configure
cmdargs > Preprocessing library for cmdargs-0.10.21..
cmdargs > Building library for cmdargs-0.10.21..
cmdargs > [ 1 of 25] Compiling Data.Generics.Any
colour > Configuring colour-2.3.5...
colour > build
cmdargs > [ 2 of 25] Compiling Data.Generics.Any.Prelude
colour > Preprocessing library for colour-2.3.5..
colour > Building library for colour-2.3.5..
colour > [ 1 of 14] Compiling Data.Colour.CIE.Chromaticity
cmdargs > [ 3 of 25] Compiling System.Console.CmdArgs.Annotate
colour > [ 2 of 14] Compiling Data.Colour.CIE.Illuminant
colour > [ 3 of 14] Compiling Data.Colour.Chan
cmdargs > [ 4 of 25] Compiling System.Console.CmdArgs.Default
colour > [ 4 of 14] Compiling Data.Colour.Internal
cmdargs > [ 5 of 25] Compiling System.Console.CmdArgs.Explicit.ExpandArgsAt
cmdargs > [ 6 of 25] Compiling System.Console.CmdArgs.Explicit.SplitJoin
cmdargs > [ 7 of 25] Compiling System.Console.CmdArgs.Explicit.Type
colour > [ 5 of 14] Compiling Data.Colour.Matrix
clock > copy/register
clock > Installing library in /Users/oivasiv/.stack/snapshots/x86_64-osx/5e51f2123ebe0cb8f05a0b49e4743eebc38bbceea3c01c0e46a8b4871413e296/8.10.4/lib/x86_64-osx-ghc-8.10.4/clock-0.8-GgyC1t0yogI8KcRGJ3XM3f
colour > [ 6 of 14] Compiling Data.Colour.RGB
clock > Registering library for clock-0.8..
cereal > [2 of 4] Compiling Data.Serialize.Put
cmdargs > [ 8 of 25] Compiling System.Console.CmdArgs.Explicit.Process
colour > [ 7 of 14] Compiling Data.Colour.RGBSpace.HSL
colour > [ 8 of 14] Compiling Data.Colour.RGBSpace.HSV
colour > [ 9 of 14] Compiling Data.Colour.SRGB.Linear
extra > configure
cmdargs > [ 9 of 25] Compiling System.Console.CmdArgs.Explicit.Complete
colour > [10 of 14] Compiling Data.Colour.RGBSpace
colour > [11 of 14] Compiling Data.Colour.SRGB
cmdargs > [10 of 25] Compiling System.Console.CmdArgs.Helper
extra > Configuring extra-1.7.9...
colour > [12 of 14] Compiling Data.Colour
extra > build
colour > [13 of 14] Compiling Data.Colour.Names
extra > Preprocessing library for extra-1.7.9..
extra > Building library for extra-1.7.9..
cereal > [3 of 4] Compiling Data.Serialize.IEEE754
extra > [ 1 of 21] Compiling Data.IORef.Extra
extra > [ 2 of 21] Compiling Data.Tuple.Extra
extra > [ 3 of 21] Compiling Data.Typeable.Extra
cereal > [4 of 4] Compiling Data.Serialize
extra > [ 4 of 21] Compiling Numeric.Extra
extra > [ 5 of 21] Compiling Partial
cereal >
cereal > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/cereal-0.5.8.1/src/Data/Serialize.hs:291:9: warning: [-Wincomplete-patterns]
cereal > Pattern match(es) are non-exhaustive
cereal > In an equation for ‘findNr’: Patterns not matched: _ _
cereal > |
cereal > 291 | findNr lo hi
cereal > | ^^^^^^^^^^^^...
extra > [ 6 of 21] Compiling Data.List.Extra
cmdargs > [11 of 25] Compiling System.Console.CmdArgs.Implicit.Ann
colour > [14 of 14] Compiling Data.Colour.CIE
cmdargs > [12 of 25] Compiling System.Console.CmdArgs.Implicit.UI
cmdargs > [13 of 25] Compiling System.Console.CmdArgs.Text
extra > [ 7 of 21] Compiling Data.Version.Extra
extra > [ 8 of 21] Compiling Data.List.NonEmpty.Extra
extra > [ 9 of 21] Compiling Data.Either.Extra
colour > copy/register
cmdargs > [14 of 25] Compiling System.Console.CmdArgs.Explicit.Help
extra > [10 of 21] Compiling Control.Exception.Extra
colour > Installing library in /Users/oivasiv/.stack/snapshots/x86_64-osx/5e51f2123ebe0cb8f05a0b49e4743eebc38bbceea3c01c0e46a8b4871413e296/8.10.4/lib/x86_64-osx-ghc-8.10.4/colour-2.3.5-C29WD8Qg69AL3qeQgayHy7
extra > [11 of 21] Compiling Control.Monad.Extra
colour > Registering library for colour-2.3.5..
extra > [12 of 21] Compiling Data.Foldable.Extra
cmdargs > [15 of 25] Compiling System.Console.CmdArgs.Verbosity
extra > [13 of 21] Compiling Control.Concurrent.Extra
cmdargs > [16 of 25] Compiling System.Console.CmdArgs.Implicit.Type
extra > [14 of 21] Compiling System.Directory.Extra
ansi-terminal> configure
extra > [15 of 21] Compiling System.Environment.Extra
extra > [16 of 21] Compiling System.IO.Extra
ansi-terminal> Configuring ansi-terminal-0.10.3...
cmdargs > [17 of 25] Compiling System.Console.CmdArgs.Explicit
ansi-terminal> build
ansi-terminal> Preprocessing library for ansi-terminal-0.10.3..
ansi-terminal> Building library for ansi-terminal-0.10.3..
cmdargs > [18 of 25] Compiling System.Console.CmdArgs.Implicit.Reader
ansi-terminal> [1 of 4] Compiling System.Console.ANSI.Types
cmdargs > [19 of 25] Compiling System.Console.CmdArgs.Implicit.Local
extra > [17 of 21] Compiling System.Info.Extra
extra > [18 of 21] Compiling System.Process.Extra
extra > [19 of 21] Compiling System.Time.Extra
extra > [20 of 21] Compiling Extra
extra > [21 of 21] Compiling Text.Read.Extra
cmdargs > [20 of 25] Compiling System.Console.CmdArgs.Implicit.Reform
extra > copy/register
cmdargs > [21 of 25] Compiling System.Console.CmdArgs.Implicit.Global
extra > Installing library in /Users/oivasiv/.stack/snapshots/x86_64-osx/5e51f2123ebe0cb8f05a0b49e4743eebc38bbceea3c01c0e46a8b4871413e296/8.10.4/lib/x86_64-osx-ghc-8.10.4/extra-1.7.9-JsV7nDKU3P4LIpqfI0ysJo
extra > Registering library for extra-1.7.9..
hashable > configure
cmdargs > [22 of 25] Compiling System.Console.CmdArgs.Implicit
cmdargs > [23 of 25] Compiling System.Console.CmdArgs.Quote
cereal >
cereal > copy/register
hashable > Configuring hashable-1.3.0.0...
cereal > Installing library in /Users/oivasiv/.stack/snapshots/x86_64-osx/5e51f2123ebe0cb8f05a0b49e4743eebc38bbceea3c01c0e46a8b4871413e296/8.10.4/lib/x86_64-osx-ghc-8.10.4/cereal-0.5.8.1-22Ay1xouyZe6jvGIwilboJ
ansi-terminal> [2 of 4] Compiling System.Console.ANSI.Codes
cereal > Registering library for cereal-0.5.8.1..
cmdargs > [24 of 25] Compiling System.Console.CmdArgs
hashable > build
ansi-terminal> [3 of 4] Compiling System.Console.ANSI.Unix
cmdargs > [25 of 25] Compiling System.Console.CmdArgs.GetOpt
hashable > Preprocessing library for hashable-1.3.0.0..
hashable > Building library for hashable-1.3.0.0..
hashable > [1 of 5] Compiling Data.Hashable.Class
hfsevents > configure
ansi-terminal> [4 of 4] Compiling System.Console.ANSI
cmdargs > copy/register
hfsevents > Configuring hfsevents-0.1.6...
cmdargs > Installing library in /Users/oivasiv/.stack/snapshots/x86_64-osx/5e51f2123ebe0cb8f05a0b49e4743eebc38bbceea3c01c0e46a8b4871413e296/8.10.4/lib/x86_64-osx-ghc-8.10.4/cmdargs-0.10.21-KlHphs6sBhIECkIRkNdEOM
cmdargs > Registering library for cmdargs-0.10.21..
ansi-terminal> copy/register
hfsevents > build
hfsevents > Preprocessing library for hfsevents-0.1.6..
hfsevents > Building library for hfsevents-0.1.6..
ansi-terminal> Installing library in /Users/oivasiv/.stack/snapshots/x86_64-osx/5e51f2123ebe0cb8f05a0b49e4743eebc38bbceea3c01c0e46a8b4871413e296/8.10.4/lib/x86_64-osx-ghc-8.10.4/ansi-terminal-0.10.3-Hpd3ONu7miU6c85cFR1uCj
hfsevents > [1 of 1] Compiling System.OSX.FSEvents
ansi-terminal> Registering library for ansi-terminal-0.10.3..
terminal-size> configure
hashable > [2 of 5] Compiling Data.Hashable.Generic.Instances
hashable > [3 of 5] Compiling Data.Hashable.Generic
hashable > [4 of 5] Compiling Data.Hashable
hashable > [5 of 5] Compiling Data.Hashable.Lifted
terminal-size> Configuring terminal-size-0.3.2.1...
terminal-size> build
unix-compat > configure
terminal-size> Preprocessing library for terminal-size-0.3.2.1..
terminal-size> Building library for terminal-size-0.3.2.1..
hashable > copy/register
hashable > Installing library in /Users/oivasiv/.stack/snapshots/x86_64-osx/5e51f2123ebe0cb8f05a0b49e4743eebc38bbceea3c01c0e46a8b4871413e296/8.10.4/lib/x86_64-osx-ghc-8.10.4/hashable-1.3.0.0-K3FFBNAmsvaIvBv4Qg15rQ
unix-compat > Configuring unix-compat-0.5.3...
terminal-size> [1 of 3] Compiling System.Console.Terminal.Common
hashable > Registering library for hashable-1.3.0.0..
unix-compat > build
unix-compat > Preprocessing library for unix-compat-0.5.3..
hfsevents >
hfsevents > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/hfsevents-0.1.6/cbits/c_fsevents.m:106:4: error:
hfsevents > warning: 'Gestalt' is deprecated: first deprecated in macOS 10.8 [-Wdeprecated-declarations]
hfsevents > Gestalt(gestaltSystemVersionMajor, majorVersion);
hfsevents > ^
hfsevents > |
hfsevents > 106 | Gestalt(gestaltSystemVersionMajor, majorVersion);
hfsevents > | ^
hfsevents >
hfsevents > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/hfsevents-0.1.6//Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreServices.framework/Frameworks/CarbonCore.framework/Headers/Gestalt.h:123:1: error:
hfsevents > note: 'Gestalt' has been explicitly marked deprecated here
hfsevents > |
hfsevents > 123 | Gestalt(
hfsevents > | ^
hfsevents > Gestalt(
hfsevents > ^
hfsevents >
hfsevents > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/hfsevents-0.1.6/cbits/c_fsevents.m:106:12: error:
hfsevents > warning: 'gestaltSystemVersionMajor' is deprecated: first deprecated in macOS 10.8 - Use NSProcessInfo's operatingSystemVersion property instead. [-Wdeprecated-declarations]
hfsevents > Gestalt(gestaltSystemVersionMajor, majorVersion);
hfsevents > ^
hfsevents > |
hfsevents > 106 | Gestalt(gestaltSystemVersionMajor, majorVersion);
hfsevents > | ^
hfsevents >
hfsevents > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/hfsevents-0.1.6//Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreServices.framework/Frameworks/CarbonCore.framework/Headers/Gestalt.h:2075:1: error:
hfsevents > note: '' has been explicitly marked deprecated here
hfsevents > |
hfsevents > 2075 | enum {
hfsevents > | ^
hfsevents > enum {
hfsevents > ^
hfsevents >
hfsevents > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/hfsevents-0.1.6/cbits/c_fsevents.m:107:4: error:
hfsevents > warning: 'Gestalt' is deprecated: first deprecated in macOS 10.8 [-Wdeprecated-declarations]
hfsevents > Gestalt(gestaltSystemVersionMinor, minorVersion);
hfsevents > ^
hfsevents > |
hfsevents > 107 | Gestalt(gestaltSystemVersionMinor, minorVersion);
hfsevents > | ^
hfsevents >
hfsevents > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/hfsevents-0.1.6//Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreServices.framework/Frameworks/CarbonCore.framework/Headers/Gestalt.h:123:1: error:
hfsevents > note: 'Gestalt' has been explicitly marked deprecated here
hfsevents > |
hfsevents > 123 | Gestalt(
hfsevents > | ^
hfsevents > Gestalt(
hfsevents > ^
hfsevents >
hfsevents > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/hfsevents-0.1.6/cbits/c_fsevents.m:107:12: error:
hfsevents > warning: 'gestaltSystemVersionMinor' is deprecated: first deprecated in macOS 10.8 - Use NSProcessInfo's operatingSystemVersion property instead. [-Wdeprecated-declarations]
hfsevents > Gestalt(gestaltSystemVersionMinor, minorVersion);
hfsevents > ^
hfsevents > |
hfsevents > 107 | Gestalt(gestaltSystemVersionMinor, minorVersion);
hfsevents > | ^
hfsevents >
hfsevents > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/hfsevents-0.1.6//Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreServices.framework/Frameworks/CarbonCore.framework/Headers/Gestalt.h:2075:1: error:
hfsevents > note: '' has been explicitly marked deprecated here
hfsevents > |
hfsevents > 2075 | enum {
hfsevents > | ^
hfsevents > enum {
hfsevents > ^
hfsevents >
hfsevents > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/hfsevents-0.1.6/cbits/c_fsevents.m:108:4: error:
hfsevents > warning: 'Gestalt' is deprecated: first deprecated in macOS 10.8 [-Wdeprecated-declarations]
hfsevents > Gestalt(gestaltSystemVersionBugFix, bugFixVersion);
hfsevents > ^
hfsevents > |
hfsevents > 108 | Gestalt(gestaltSystemVersionBugFix, bugFixVersion);
hfsevents > | ^
hfsevents >
hfsevents > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/hfsevents-0.1.6//Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreServices.framework/Frameworks/CarbonCore.framework/Headers/Gestalt.h:123:1: error:
hfsevents > note: 'Gestalt' has been explicitly marked deprecated here
hfsevents > |
hfsevents > 123 | Gestalt(
hfsevents > | ^
hfsevents > Gestalt(
hfsevents > ^
hfsevents >
hfsevents > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/hfsevents-0.1.6/cbits/c_fsevents.m:108:12: error:
hfsevents > warning: 'gestaltSystemVersionBugFix' is deprecated: first deprecated in macOS 10.8 - Use NSProcessInfo's operatingSystemVersion property instead. [-Wdeprecated-declarations]
hfsevents > Gestalt(gestaltSystemVersionBugFix, bugFixVersion);
hfsevents > ^
hfsevents > |
hfsevents > 108 | Gestalt(gestaltSystemVersionBugFix, bugFixVersion);
hfsevents > | ^
hfsevents >
hfsevents > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/hfsevents-0.1.6//Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreServices.framework/Frameworks/CarbonCore.framework/Headers/Gestalt.h:2075:1: error:
hfsevents > note: '' has been explicitly marked deprecated here
hfsevents > |
hfsevents > 2075 | enum {
hfsevents > | ^
hfsevents > enum {
hfsevents > ^
hfsevents > 6 warnings generated.
async > configure
terminal-size> [2 of 3] Compiling System.Console.Terminal.Posix
hfsevents >
hfsevents > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/hfsevents-0.1.6/cbits/c_fsevents.m:106:4: error:
hfsevents > warning: 'Gestalt' is deprecated: first deprecated in macOS 10.8 [-Wdeprecated-declarations]
hfsevents > Gestalt(gestaltSystemVersionMajor, majorVersion);
hfsevents > ^
hfsevents > |
hfsevents > 106 | Gestalt(gestaltSystemVersionMajor, majorVersion);
hfsevents > | ^
hfsevents >
hfsevents > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/hfsevents-0.1.6//Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreServices.framework/Frameworks/CarbonCore.framework/Headers/Gestalt.h:123:1: error:
hfsevents > note: 'Gestalt' has been explicitly marked deprecated here
hfsevents > |
hfsevents > 123 | Gestalt(
hfsevents > | ^
hfsevents > Gestalt(
hfsevents > ^
hfsevents >
hfsevents > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/hfsevents-0.1.6/cbits/c_fsevents.m:106:12: error:
hfsevents > warning: 'gestaltSystemVersionMajor' is deprecated: first deprecated in macOS 10.8 - Use NSProcessInfo's operatingSystemVersion property instead. [-Wdeprecated-declarations]
hfsevents > Gestalt(gestaltSystemVersionMajor, majorVersion);
hfsevents > ^
hfsevents > |
hfsevents > 106 | Gestalt(gestaltSystemVersionMajor, majorVersion);
hfsevents > | ^
hfsevents >
hfsevents > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/hfsevents-0.1.6//Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreServices.framework/Frameworks/CarbonCore.framework/Headers/Gestalt.h:2075:1: error:
hfsevents > note: '' has been explicitly marked deprecated here
hfsevents > |
hfsevents > 2075 | enum {
hfsevents > | ^
hfsevents > enum {
hfsevents > ^
hfsevents >
hfsevents > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/hfsevents-0.1.6/cbits/c_fsevents.m:107:4: error:
hfsevents > warning: 'Gestalt' is deprecated: first deprecated in macOS 10.8 [-Wdeprecated-declarations]
hfsevents > Gestalt(gestaltSystemVersionMinor, minorVersion);
hfsevents > ^
hfsevents > |
hfsevents > 107 | Gestalt(gestaltSystemVersionMinor, minorVersion);
hfsevents > | ^
hfsevents >
hfsevents > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/hfsevents-0.1.6//Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreServices.framework/Frameworks/CarbonCore.framework/Headers/Gestalt.h:123:1: error:
hfsevents > note: 'Gestalt' has been explicitly marked deprecated here
hfsevents > |
hfsevents > 123 | Gestalt(
hfsevents > | ^
hfsevents > Gestalt(
hfsevents > ^
hfsevents >
hfsevents > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/hfsevents-0.1.6/cbits/c_fsevents.m:107:12: error:
hfsevents > warning: 'gestaltSystemVersionMinor' is deprecated: first deprecated in macOS 10.8 - Use NSProcessInfo's operatingSystemVersion property instead. [-Wdeprecated-declarations]
hfsevents > Gestalt(gestaltSystemVersionMinor, minorVersion);
hfsevents > ^
hfsevents > |
hfsevents > 107 | Gestalt(gestaltSystemVersionMinor, minorVersion);
hfsevents > | ^
hfsevents >
hfsevents > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/hfsevents-0.1.6//Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreServices.framework/Frameworks/CarbonCore.framework/Headers/Gestalt.h:2075:1: error:
hfsevents > note: '' has been explicitly marked deprecated here
hfsevents > |
hfsevents > 2075 | enum {
hfsevents > | ^
hfsevents > enum {
hfsevents > ^
hfsevents >
hfsevents > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/hfsevents-0.1.6/cbits/c_fsevents.m:108:4: error:
hfsevents > warning: 'Gestalt' is deprecated: first deprecated in macOS 10.8 [-Wdeprecated-declarations]
hfsevents > Gestalt(gestaltSystemVersionBugFix, bugFixVersion);
hfsevents > ^
hfsevents > |
hfsevents > 108 | Gestalt(gestaltSystemVersionBugFix, bugFixVersion);
hfsevents > | ^
hfsevents >
hfsevents > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/hfsevents-0.1.6//Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreServices.framework/Frameworks/CarbonCore.framework/Headers/Gestalt.h:123:1: error:
hfsevents > note: 'Gestalt' has been explicitly marked deprecated here
hfsevents > |
hfsevents > 123 | Gestalt(
hfsevents > | ^
hfsevents > Gestalt(
hfsevents > ^
hfsevents >
hfsevents > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/hfsevents-0.1.6/cbits/c_fsevents.m:108:12: error:
hfsevents > warning: 'gestaltSystemVersionBugFix' is deprecated: first deprecated in macOS 10.8 - Use NSProcessInfo's operatingSystemVersion property instead. [-Wdeprecated-declarations]
hfsevents > Gestalt(gestaltSystemVersionBugFix, bugFixVersion);
hfsevents > ^
hfsevents > |
hfsevents > 108 | Gestalt(gestaltSystemVersionBugFix, bugFixVersion);
hfsevents > | ^
hfsevents >
hfsevents > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/hfsevents-0.1.6//Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreServices.framework/Frameworks/CarbonCore.framework/Headers/Gestalt.h:2075:1: error:
hfsevents > note: '' has been explicitly marked deprecated here
hfsevents > |
hfsevents > 2075 | enum {
hfsevents > | ^
hfsevents > enum {
hfsevents > ^
hfsevents > 6 warnings generated.
unix-compat > Building library for unix-compat-0.5.3..
async > Configuring async-2.2.3...
terminal-size> [3 of 3] Compiling System.Console.Terminal.Size
async > build
unix-compat > [1 of 8] Compiling System.PosixCompat.Files
hfsevents > copy/register
async > Preprocessing library for async-2.2.3..
async > Building library for async-2.2.3..
hfsevents > Installing library in /Users/oivasiv/.stack/snapshots/x86_64-osx/5e51f2123ebe0cb8f05a0b49e4743eebc38bbceea3c01c0e46a8b4871413e296/8.10.4/lib/x86_64-osx-ghc-8.10.4/hfsevents-0.1.6-DmcXi29r7B8LQG2VHsOEts
unix-compat > [2 of 8] Compiling System.PosixCompat.Temp
async > [1 of 1] Compiling Control.Concurrent.Async
hfsevents > Registering library for hfsevents-0.1.6..
terminal-size> copy/register
unix-compat > [3 of 8] Compiling System.PosixCompat.Time
terminal-size> Installing library in /Users/oivasiv/.stack/snapshots/x86_64-osx/5e51f2123ebe0cb8f05a0b49e4743eebc38bbceea3c01c0e46a8b4871413e296/8.10.4/lib/x86_64-osx-ghc-8.10.4/terminal-size-0.3.2.1-HihNy0RThZk4O1UkYpAxTd
unix-compat > [4 of 8] Compiling System.PosixCompat.Types
unix-compat > [5 of 8] Compiling System.PosixCompat.Extensions
terminal-size> Registering library for terminal-size-0.3.2.1..
async >
async > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/async-2.2.3/Control/Concurrent/Async.hs:215:1: warning: [-Wunused-imports]
async > The import of ‘Data.Semigroup’ is redundant
async > except perhaps to import instances from ‘Data.Semigroup’
async > To import instances alone, use: import Data.Semigroup()
async > |
async > 215 | import Data.Semigroup (Semigroup((<>)))
async > | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
unix-compat > [6 of 8] Compiling System.PosixCompat.Unistd
unix-compat > [7 of 8] Compiling System.PosixCompat.User
unix-compat > [8 of 8] Compiling System.PosixCompat
unix-compat > copy/register
unix-compat > Installing library in /Users/oivasiv/.stack/snapshots/x86_64-osx/5e51f2123ebe0cb8f05a0b49e4743eebc38bbceea3c01c0e46a8b4871413e296/8.10.4/lib/x86_64-osx-ghc-8.10.4/unix-compat-0.5.3-2aWOCxmwkXJ2vKfu7bHqHW
async >
unix-compat > Registering library for unix-compat-0.5.3..
async > copy/register
async > Installing library in /Users/oivasiv/.stack/snapshots/x86_64-osx/5e51f2123ebe0cb8f05a0b49e4743eebc38bbceea3c01c0e46a8b4871413e296/8.10.4/lib/x86_64-osx-ghc-8.10.4/async-2.2.3-I4TgeWeEAzqFNG8LMs7HfA
async > Registering library for async-2.2.3..
fsnotify > configure
fsnotify > Configuring fsnotify-0.3.0.1...
fsnotify > build
fsnotify > Preprocessing library for fsnotify-0.3.0.1..
fsnotify > Building library for fsnotify-0.3.0.1..
fsnotify > [1 of 7] Compiling System.FSNotify.Path
fsnotify > [2 of 7] Compiling System.FSNotify.Types
fsnotify > [3 of 7] Compiling System.FSNotify.Listener
fsnotify > [4 of 7] Compiling System.FSNotify.Polling
fsnotify >
fsnotify > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/fsnotify-0.3.0.1/src/System/FSNotify/Polling.hs:19:1: warning: [-Wunused-imports]
fsnotify > The import of ‘getCurrentTime’
fsnotify > from module ‘Data.Time.Clock’ is redundant
fsnotify > |
fsnotify > 19 | import Data.Time.Clock (UTCTime, getCurrentTime)
fsnotify > | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
fsnotify >
fsnotify > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/fsnotify-0.3.0.1/src/System/FSNotify/Polling.hs:64:17: warning: [-Wname-shadowing]
fsnotify > This binding for ‘path’ shadows the existing binding
fsnotify > bound at src/System/FSNotify/Polling.hs:58:22
fsnotify > |
fsnotify > 64 | pathAndInfo path = handle (\(_ :: IOException) -> return Nothing) $ do
fsnotify > | ^^^^
fsnotify > [5 of 7] Compiling System.FSNotify.OSX
fsnotify >
fsnotify > /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/stack-b64d6bffac318d73/fsnotify-0.3.0.1/src/System/FSNotify/OSX.hs:84:5: warning: [-Wunused-local-binds]
fsnotify > Defined but not used: ‘isFile’
fsnotify > |
fsnotify > 84 | isFile = hasFlag e FSE.eventFlagItemIsFile
fsnotify > | ^^^^^^
fsnotify > [6 of 7] Compiling System.FSNotify
fsnotify > [7 of 7] Compiling System.FSNotify.Devel
fsnotify >
fsnotify > copy/register
fsnotify > Installing library in /Users/oivasiv/.stack/snapshots/x86_64-osx/5e51f2123ebe0cb8f05a0b49e4743eebc38bbceea3c01c0e46a8b4871413e296/8.10.4/lib/x86_64-osx-ghc-8.10.4/fsnotify-0.3.0.1-EO9zWvFrT8K8EYsUHXztbo
fsnotify > Registering library for fsnotify-0.3.0.1..
ghcid > configure
ghcid > Configuring ghcid-0.8.7...
ghcid > build
ghcid > Preprocessing library for ghcid-0.8.7..
ghcid > Building library for ghcid-0.8.7..
ghcid > [1 of 6] Compiling Language.Haskell.Ghcid.Escape
ghcid > [2 of 6] Compiling Language.Haskell.Ghcid.Types
ghcid > [3 of 6] Compiling Language.Haskell.Ghcid.Parser
ghcid > [4 of 6] Compiling Language.Haskell.Ghcid.Util
ghcid > [5 of 6] Compiling Language.Haskell.Ghcid
ghcid > [6 of 6] Compiling Paths_ghcid
ghcid > Preprocessing executable 'ghcid' for ghcid-0.8.7..
ghcid > Building executable 'ghcid' for ghcid-0.8.7..
ghcid > [ 1 of 10] Compiling Language.Haskell.Ghcid.Escape
ghcid > [ 2 of 10] Compiling Language.Haskell.Ghcid.Terminal
ghcid > [ 3 of 10] Compiling Language.Haskell.Ghcid.Types
ghcid > [ 4 of 10] Compiling Language.Haskell.Ghcid.Parser
ghcid > [ 5 of 10] Compiling Language.Haskell.Ghcid.Util
ghcid > [ 6 of 10] Compiling Language.Haskell.Ghcid
ghcid > [ 7 of 10] Compiling Paths_ghcid
ghcid > [ 8 of 10] Compiling Session
ghcid > [ 9 of 10] Compiling Wait
ghcid > [10 of 10] Compiling Ghcid
ghcid > Linking .stack-work/dist/x86_64-osx/Cabal-3.2.1.0/build/ghcid/ghcid ...
ghcid > copy/register
ghcid > Installing library in /Users/oivasiv/.stack/snapshots/x86_64-osx/5e51f2123ebe0cb8f05a0b49e4743eebc38bbceea3c01c0e46a8b4871413e296/8.10.4/lib/x86_64-osx-ghc-8.10.4/ghcid-0.8.7-FScrtpUXk0oGhWchMGUkoD
ghcid > Installing executable ghcid in /Users/oivasiv/.stack/snapshots/x86_64-osx/5e51f2123ebe0cb8f05a0b49e4743eebc38bbceea3c01c0e46a8b4871413e296/8.10.4/bin
ghcid > Registering library for ghcid-0.8.7..
Completed 13 action(s).
Copying from /Users/oivasiv/.stack/snapshots/x86_64-osx/5e51f2123ebe0cb8f05a0b49e4743eebc38bbceea3c01c0e46a8b4871413e296/8.10.4/bin/ghcid to /Users/oivasiv/.local/bin/ghcid
Copied executables to /Users/oivasiv/.local/bin:
- ghcid
8. Add a “hole” to our module and check how ghcid works¶
diff --git a/src/Lib.hs b/src/Lib.hs
index d36ff27..93c9269 100644
--- a/src/Lib.hs
+++ b/src/Lib.hs
@@ -3,4 +3,4 @@ module Lib
) where
someFunc :: IO ()
-someFunc = putStrLn "someFunc"
+someFunc = putStrLn _
\ No newline at end of file
file: src/Lib.hs
module Lib
( someFunc
) where
someFunc :: IO ()
someFunc = putStrLn _
/Users/oivasiv/Projects/haskell_prj/haskell-first-prj/src/Lib.hs:6:21: error:
• Found hole: _ :: String
• In the first argument of ‘putStrLn’, namely ‘_’
In the expression: putStrLn _
In an equation for ‘someFunc’: someFunc = putStrLn _
• Relevant bindings include
someFunc :: IO ()
(bound at /Users/oivasiv/Projects/haskell_prj/haskell-first-prj/src/Lib.hs:6:1)
Valid hole fits include
[] :: forall a. [a]
with [] @Char
(bound at <wired into compiler>)
mempty :: forall a. Monoid a => a
with mempty @[Char]
(imported from ‘Prelude’ at /Users/oivasiv/Projects/haskell_prj/haskell-first-prj/src/Lib.hs:1:8-10
(and originally defined in ‘GHC.Base’))
|
6 | someFunc = putStrLn _
9. Play with Stack repl¶
Run:stack repl
Log:
$ stack repl
Using main module: 1. Package `haskell-first-prj' component haskell-first-prj:exe:haskell-first-prj-exe with main-is file: /Users/oivasiv/Projects/haskell_prj/haskell-first-prj/app/Main.hs
haskell-first-prj> configure (lib + exe)
Configuring haskell-first-prj-0.1.0.0...
haskell-first-prj> initial-build-steps (lib + exe)
The following GHC options are incompatible with GHCi and have not been passed to it: -threaded
Configuring GHCi with the following packages: haskell-first-prj
* * * * * * * *
Warning: Multiple files use the same module name:
* Paths_haskell_first_prj found at the following paths
* /Users/oivasiv/Projects/haskell_prj/haskell-first-prj/.stack-work/dist/x86_64-osx/Cabal-3.2.1.0/build/autogen/Paths_haskell_first_prj.hs (haskell-first-prj:lib)
* /Users/oivasiv/Projects/haskell_prj/haskell-first-prj/.stack-work/dist/x86_64-osx/Cabal-3.2.1.0/build/haskell-first-prj-exe/autogen/Paths_haskell_first_prj.hs (haskell-first-prj:exe:haskell-first-prj-exe)
* * * * * * * *
GHCi, version 8.10.4: https://www.haskell.org/ghc/ :? for help
[1 of 3] Compiling Lib ( /Users/oivasiv/Projects/haskell_prj/haskell-first-prj/src/Lib.hs, interpreted )
[2 of 3] Compiling Main ( /Users/oivasiv/Projects/haskell_prj/haskell-first-prj/app/Main.hs, interpreted )
[3 of 3] Compiling Paths_haskell_first_prj ( /Users/oivasiv/Projects/haskell_prj/haskell-first-prj/.stack-work/dist/x86_64-osx/Cabal-3.2.1.0/build/autogen/Paths_haskell_first_prj.hs, interpreted )
Ok, three modules loaded.
Loaded GHCi configuration from /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/haskell-stack-ghci/78718bc1/ghci-script
*Main Lib Paths_haskell_first_prj>
9.1. How to fix Warning: Multiple files use the same module name:¶
* * * * * * * *
Warning: Multiple files use the same module name:
* Paths_haskell_first_prj found at the following paths
* /Users/oivasiv/Projects/haskell_prj/haskell-first-prj/.stack-work/dist/x86_64-osx/Cabal-3.2.1.0/build/autogen/Paths_haskell_first_prj.hs (haskell-first-prj:lib)
* /Users/oivasiv/Projects/haskell_prj/haskell-first-prj/.stack-work/dist/x86_64-osx/Cabal-3.2.1.0/build/haskell-first-prj-exe/autogen/Paths_haskell_first_prj.hs (haskell-first-prj:exe:haskell-first-prj-exe)
* * * * * * * *
Well, I have found one interesting post on reddit and github:
- Reddit Module automatically generated by stack seems to be duplicated?
- Github: Stack new myproj produces warning with stack ghci #5439
Ppl are suggesting to add:
when:
- condition: false
other-modules: Paths_pkg
Update package.yaml file
diff --git a/package.yaml b/package.yaml
index af9ead7..cf13e7b 100644
--- a/package.yaml
+++ b/package.yaml
@@ -35,6 +35,9 @@ executables:
- -with-rtsopts=-N
dependencies:
- haskell-first-prj
+ when:
+ - condition: false
+ other-modules: Paths_haskell_first_prj
tests:
haskell-first-prj-test:
Run: stack build
Check updated haskell-first-prj.cabal file
diff --git a/haskell-first-prj.cabal b/haskell-first-prj.cabal
index 7d3d676..2ef8c5d 100644
--- a/haskell-first-prj.cabal
+++ b/haskell-first-prj.cabal
@@ -36,8 +36,6 @@ library
executable halyph-first-exe
main-is: Main.hs
- other-modules:
- Paths_haskell_first_prj
hs-source-dirs:
app
ghc-options: -threaded -rtsopts -with-rtsopts=-N
And finally run stack repl
$ stack repl
Using main module: 1. Package `haskell-first-prj' component haskell-first-prj:exe:halyph-first-exe with main-is file: /Users/oivasiv/Projects/haskell_prj/haskell-first-prj/app/Main.hs
The following GHC options are incompatible with GHCi and have not been passed to it: -threaded
Configuring GHCi with the following packages: haskell-first-prj
GHCi, version 8.10.4: https://www.haskell.org/ghc/ :? for help
[1 of 3] Compiling Lib ( /Users/oivasiv/Projects/haskell_prj/haskell-first-prj/src/Lib.hs, interpreted )
[2 of 3] Compiling Main ( /Users/oivasiv/Projects/haskell_prj/haskell-first-prj/app/Main.hs, interpreted )
[3 of 3] Compiling Paths_haskell_first_prj ( /Users/oivasiv/Projects/haskell_prj/haskell-first-prj/.stack-work/dist/x86_64-osx/Cabal-3.2.1.0/build/autogen/Paths_haskell_first_prj.hs, interpreted )
Ok, three modules loaded.
Loaded GHCi configuration from /private/var/folders/y0/kq4s__nj791b01t7zw8pb6dxr2_wl5/T/haskell-stack-ghci/78718bc1/ghci-script
*Main Lib Paths_haskell_first_prj>
As you can see this “Warning” has gone.
9.2. REPL in action¶
*Main Lib Paths_haskell_first_prj>
*Main Lib Paths_haskell_first_prj> someFunc
someFunc
*Main Lib Paths_haskell_first_prj> :t someFunc
someFunc :: IO ()
*Main Lib Paths_haskell_first_prj> :r
[2 of 3] Compiling Lib ( /Users/oivasiv/Projects/haskell_prj/haskell-first-prj/src/Lib.hs, interpreted )
Ok, three modules loaded.
*Main Lib Paths_haskell_first_prj> someFunc
Sunny day in hell
*Main Lib Paths_haskell_first_prj> :t someFunc
someFunc :: IO ()
*Main Lib Paths_haskell_first_prj>
10. VSCode: Switch focus between editor and integrated terminal¶
Open the keybindings.json from the editor: Cmd+Shift+P -> “Preferences: Open Keyboard Shortcuts” JSON and add these entries:
// Place your key bindings in this file to override the defaults
[
// Toggle between terminal and editor focus
{ "key": "ctrl+`", "command": "workbench.action.terminal.focus"},
{ "key": "ctrl+`", "command": "workbench.action.focusActiveEditorGroup", "when": "terminalFocus"}
]
11. VSCode adjust layout¶
- Project Tree
- Editor
- REPL/Teminal
ghcidterminal
