Issue with macros and in-memory (virtual) source files

[vasilmkd]

I opened the same ticket in the Scala 3 repo.

https://github.com/scala/scala3/issues/20591

The issue affects all versions of Scala, and the implementation details are relevant to both Scala 2 and Scala 3, as the sources in question have been transferred from Scala 2 to Scala 3 over the years.

Thanks in advance.

[vasilmkd]

To be clear, the issue is not immediately reproducible with MUnit and Scala 2. But the possibility of the same issue exists. Let's see how the discussion in the Scala 3 repo unfolds.

[som-snytt]

The disclaimer was always:

This library is considered experimental and should not be used unless you know what you are doing.

Demonstrate that sourcecode and munit for Scala 2 both use path for source path (and not file):

//> using scala 2.13
//> using options -Wnonunit-statement -Xlint -Xsource:3-cross
//> using dep com.lihaoyi::sourcecode:0.4.2
//> using dep com.lihaoyi::os-lib:0.10.2
//> using dep org.scalameta::munit:1.0.0
//> using dep org.scala-lang:scala-compiler:2.13.14

import java.io.{InputStreamReader, PrintStream, StringWriter}

import scala.reflect.io.VirtualFile
import scala.sys.process.*
import scala.tools.nsc.{Global, Settings}
import scala.util.Using
import scala.util.chaining.*

object Test extends App {
  val tmp = os.temp.dir()
  val s = new Settings().tap(_.processArgumentString(s"-usejavacp -d $tmp -Xlint"))
  val g = new Global(s)
  val f = new VirtualFile(name="vf", path="/p/vf")
  def code =
    s"""
     |object Test extends App {
     |  println {
     |    s"hello, new world at $${sourcecode.File()}"
     |  }
     |  println(new LocationTestSuite().munitTests().map(_.body()))
     |}
     |
     |class LocationTestSuite extends munit.FunSuite {
     |  test("location") {
     |    assert(true)
     |  }
     |}
    """.stripMargin
  Using.resource(new PrintStream(f.output))(_.print(code))
  val txt = Using.resource(new InputStreamReader(f.input)) { reader =>
    val w = new StringWriter
    reader.transferTo(w)
    w.toString
  }
  assert(txt == code)
  println {
    s"hello, world at ${sourcecode.File()}"
  }
  val r = new g.Run
  r.compileFiles(List(f))
  assert(!g.reporter.hasErrors)
  val cp = g.classPath.asClassPathStrings.filter(_.endsWith(".jar")).mkString(":") + s":$tmp"
  println {
    Seq("scala", "-cp", cp, "Test").!!
  }
}