"unsued pattern varibale" compiler warning

[lefou]

In Mill test suite, I see a lot of these warning originating in utest.Tests.

18355] [warn] libs/scalalib/test/src/mill/scalalib/HelloWorldTests.scala:120:22
18355]   def tests: Tests = Tests {
18355]                      ^^^^^^^
18355] unused pattern variable

// HelloWorkdTests.scala
...:
 13: import utest.*
 14:
 15: object HelloWorldTests extends TestSuite {
...:
120:   def tests: Tests = Tests {
...:
305: }