Scalatest: bad parameter reference at inlining (regression)

[TomasMikula]

Scalatest 3.2.9 (Scala 3.0.0)

Scastie: https://scastie.scala-lang.org/bS9fESLzT6OPvUFDKblNDw

import org.scalatest.funsuite.AnyFunSuite

class Tests extends AnyFunSuite {

  test("foo") {
    case class Pair[X, Y](
      x: X,
      y: Y,
    )
  }

}

results in this error when compiling

bad parameter reference Pair.this.X at inlining
the parameter is type X in class Pair but the prefix (Pair.this : Pair[X, Y])
does not define any corresponding arguments.
idx = 0, args = List()

It used to compile fine with Scalatest 3.2.8 (Scala 3.0.0-RC3).

[cheeseng]

@TomasMikula I took a look at this, and the problem can be minimized to this without ScalaTest:

class TestSuite {
  inline def test(fun: => Any): Any = fun
  test {
    case class Pair[X, Y](
      x: X,
      y: Y,
    )
    () 
  }
}

I have created an example project here:

https://github.com/cheeseng/scala3-case-class-inline-problem

I'll try to reach the dotty gitter and see if we can find a cause, for now the workaround may be is to move the case class declaration out of the test block.

[cheeseng]

@TomasMikula Fyi I submitted a ticket here: https://github.com/lampepfl/dotty/issues/12508

[TomasMikula]

Great, thank you!