Address compiler warning/notice

[keiravillekode]

No description provided.

[keiravillekode]

One exercise has errors with the latest compiler, two have warnings.

We might want to either fix github.com/vlang Test to use the same compiler version as github.com/vlang-test-runner, or update the exercises and test runner for a more recent V compiler version.

Checking allergies exercise...
---- Testing... ----------------------------------------------------------------
temp/run_test.v:197:17: error: sorted_with_compare callback function parameter `left` with type `voidptr` should be `&Allergen`
  195 | }
  196 | 
  197 | fn compare(left voidptr, right voidptr) int {
      |                 ~~~~~~~
  198 |     return int(left) - int(right)
  199 | }
temp/run_test.v:197:32: error: sorted_with_compare callback function parameter `right` with type `voidptr` should be `&Allergen`
  195 | }
  196 | 
  197 | fn compare(left voidptr, right voidptr) int {
      |                                ~~~~~~~
  198 |     return int(left) - int(right)
  199 | }
checker summary: 2 V errors, 0 V warnings, 0 V notices

Checking custom_set exercise...
---- Testing... ----------------------------------------------------------------
OK     302.047 ms /home/runner/work/vlang/vlang/temp/run_test.v
temp/run_test.v:3:1: warning: const () groups will be an error after 2025-01-01 (`v fmt -w source.v` will fix that for you)
--------------------------------------------------------------------------------
    1 | module main
    2 | 
    3 | const (
      | ~~~~~
    4 |     empty         = CustomSet.new([]int{})
    5 |     another_empty = CustomSet.new([]int{})
...
checker summary: 0 V errors, 1 V warnings, 0 V notices

Checking isbn_verifier exercise...
---- Testing... ----------------------------------------------------------------
OK     332.486 ms /home/runner/work/vlang/vlang/temp/run_test.v
temp/isbn_verifier.v:6:1: warning: const () groups will be an error after 2025-01-01 (`v fmt -w source.v` will fix that for you)
    4 | import regex { regex_opt }
    5 | 
    6 | const (
      | ~~~~~
    7 |     isbn_len = 10
    8 |
...
checker summary: 0 V errors, 1 V warnings, 0 V notices

[keiravillekode]

We need something like this PR, now that the V test runner has been updated

Without this PR, tests for the Allergies exercise currently fail to compile.
https://exercism.org/tracks/vlang/exercises/allergies/

[hraftery]

We might want to either fix github.com/vlang Test to use the same compiler version as github.com/vlang-test-runner

FWIW, this was the motivation behind exercism/vlang-test-runner#10 which was completed (after a brief red herring) here: exercism/vlang-test-runner@31c843f

At the time I wasn't sure how the track worked, so focused on making the test-runner predictable. AFAIK that's working well, and I think you've been able to keep it up to date.

Turning my attention to the track, I see now that it uses a GitHub Action for obtaining v, relying on this: https://github.com/vlang/setup-v

That project seems to have supported a version: key to specify the version of v all along. I wonder if we should include that key here:

vlang/.github/workflows/test.yml

Line 37 in 757a23f

uses: vlang/setup-v@f0b3323984699c80284901a9ffd8d3e2997f22b2

Then at least they could be updated in lock-step, and you could test both before committing.