Documented example of detailed-0.9 test-suite has runtime error

[chreekat]

• Cabal-1.24.2.0
• cabal-install:

  cabal-install version 2.0.0.0
  compiled using version 2.0.0.2 of the Cabal library
  

• NixOS 17.09

Using the bar.cabal and Bar.hs as listed at https://www.haskell.org/cabal/users-guide/developing-packages.html#example-package-using-detailed-0-9-interface

This is what I get:

$ cabal configure --enable-tests; cabal build; cabal test
Resolving dependencies...
Configuring bar-1.0...
Preprocessing test suite 'test-bar' for bar-1.0..
Building test suite 'test-bar' for bar-1.0..
[1 of 1] Compiling Main             ( dist/build/test-barStub/test-barStub-tmp/test-barStub.hs, dist/build/test-barStub/test-barStub-tmp/Main.o )
Linking dist/build/test-barStub/test-barStub ...
Preprocessing test suite 'test-bar' for bar-1.0..
Building test suite 'test-bar' for bar-1.0..
[1 of 1] Compiling Main             ( dist/build/test-barStub/test-barStub-tmp/test-barStub.hs, dist/build/test-barStub/test-barStub-tmp/Main.o )
Linking dist/build/test-barStub/test-barStub ...
Running 1 test suites...
Test suite test-bar: RUNNING...
Prelude.read: no parse

[ulysses4ever]

Future-proof link: https://cabal.readthedocs.io/en/3.14/cabal-package-description-file.html#example-package-using-detailed-0-9-interface

[chreekat]

Wow, I was writing tickets for Cabal in 2018? :D That's, like, three hundred years ago in Covid years.

Anyway, the behavior is different now. The example still fails, but only because of the version bounds on Cabal.

$ cabal test
Resolving dependencies...
Error: [Cabal-7043]
Cannot test the package bar-1.0 because none of the components are available to build: the test suite 'test-bar' is not available because the solver picked a plan that does not include the test suites, perhaps because no such plan exists. To see the error message explaining the problems with such plans, force the solver to include the test suites for all packages, by adding the line 'tests: True' to the 'cabal.project.local' file.

[b@kuusi:~/tmp/detailed/proj]$ echo tests: True > cabal.project.local

[b@kuusi:~/tmp/detailed/proj]$ cabal test
Resolving dependencies...
Error: [Cabal-7107]
Could not resolve dependencies:
[__0] trying: bar-1.0 (user goal)
[__1] trying: bar:*test
[__2] trying: base-4.18.2.1/installed-4.18.2.1 (dependency of bar *test)
[__3] next goal: Cabal (dependency of bar *test)
[__3] rejecting: Cabal; 3.10.3.0/installed-3.10.3.0, 3.14.2.0, 3.14.1.1, 3.14.1.0, 3.14.0.0, 3.12.1.0, 3.12.0.0, 3.10.3.0, 3.10.2.1, 3.10.2.0, 3.10.1.0, 3.8.1.0, 3.6.3.0, 3.6.2.0, 3.6.1.0, 3.6.0.0, 3.4.1.0, 3.4.0.0, 3.2.1.0, 3.2.0.0, 3.0.2.0, 3.0.1.0, 3.0.0.0, 2.4.1.0, 2.4.0.1, 2.4.0.0, 2.2.0.1, 2.2.0.0, 2.0.1.1, 2.0.1.0, 2.0.0.2 (conflict: bar *test => Cabal>=1.9.2 && <2)
[__3] trying: Cabal-1.24.2.0
[__4] next goal: unix (dependency of Cabal)
[__4] rejecting: unix-2.8.4.0/installed-2.8.4.0 (conflict: Cabal => unix>=2.5 && <2.8)
[__4] skipping: unix; 2.8.7.0, 2.8.6.0, 2.8.5.1, 2.8.5.0, 2.8.4.0, 2.8.3.0, 2.8.2.1, 2.8.2.0, 2.8.1.1, 2.8.1.0, 2.8.0.0 (has the same characteristics that caused the previous version to fail: excluded by constraint '>=2.5 && <2.8' from 'Cabal')
[__4] trying: unix-2.7.3
[__5] next goal: process (dependency of Cabal)
[__5] rejecting: process-1.6.19.0/installed-1.6.19.0 (conflict: Cabal => process>=1.1.0.1 && <1.5)
[__5] skipping: process; 1.6.26.1, 1.6.26.0, 1.6.25.0, 1.6.24.0, 1.6.23.0, 1.6.22.0, 1.6.21.0, 1.6.20.0, 1.6.19.0, 1.6.18.0, 1.6.17.0, 1.6.16.0, 1.6.15.0, 1.6.14.0, 1.6.13.2, 1.6.13.1, 1.6.12.0, 1.6.11.0, 1.6.10.0, 1.6.9.0, 1.6.8.2, 1.6.8.1, 1.6.8.0, 1.6.7.0, 1.6.6.0, 1.6.5.1, 1.6.5.0, 1.6.4.0, 1.6.3.0, 1.6.2.0, 1.6.1.0, 1.6.0.0, 1.5.0.0 (has the same characteristics that caused the previous version to fail: excluded by constraint '>=1.1.0.1 && <1.5' from 'Cabal')
[__5] rejecting: process-1.4.3.0 (conflict: base==4.18.2.1/installed-4.18.2.1, process => base>=4.4 && <4.11)
[__5] skipping: process; 1.4.2.0, 1.4.1.0, 1.4.0.0, 1.3.0.0, 1.2.3.0, 1.2.2.0, 1.2.1.0, 1.2.0.0, 1.1.0.2 (has the same characteristics that caused the previous version to fail: excludes 'base' version 4.18.2.1)
[__5] trying: process-1.1.0.1
[__6] next goal: directory (dependency of Cabal)
[__6] rejecting: directory-1.3.8.5/installed-1.3.8.5 (conflict: process => directory>=1.0 && <1.2)
[__6] skipping: directory; 1.3.9.0, 1.3.8.5, 1.3.8.4, 1.3.8.3, 1.3.8.2, 1.3.8.1, 1.3.8.0, 1.3.7.1, 1.3.7.0, 1.3.6.2, 1.3.6.1, 1.3.6.0, 1.3.5.0, 1.3.4.0, 1.3.3.2, 1.3.3.1, 1.3.3.0, 1.3.2.2, 1.3.2.1, 1.3.2.0, 1.3.1.5, 1.3.1.4, 1.3.1.3, 1.3.1.2, 1.3.1.1, 1.3.1.0, 1.3.0.2, 1.3.0.1, 1.3.0.0, 1.2.7.1, 1.2.7.0, 1.2.6.3, 1.2.6.2, 1.2.5.1, 1.2.5.0, 1.2.4.0, 1.2.3.1, 1.2.3.0, 1.2.2.1, 1.2.2.0, 1.2.1.0, 1.2.0.1, 1.2.0.0 (has the same characteristics that caused the previous version to fail: excluded by constraint '>=1.0 && <1.2' from 'process')
[__6] rejecting: directory-1.1.0.2 (conflict: base==4.18.2.1/installed-4.18.2.1, directory => base>=4.4 && <4.6)
[__6] skipping: directory; 1.1.0.1, 1.1.0.0, 1.0.1.2, 1.0.1.1, 1.0.1.0, 1.0.0.3, 1.0.0.0, 1.2.6.1 (has the same characteristics that caused the previous version to fail: excludes 'base' version 4.18.2.1)
[__6] fail (backjumping, conflict set: Cabal, base, directory, process)
After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: Cabal, process, base, directory, unix, bar, bar:test
Try running with --minimize-conflict-set to improve the error message.

After modifying the bounds, the test works.

[chreekat]

"fixed" in #10985