scala> import java.nio.file.Files
import dotty.tools.io.File
val r = new scalafix.internal.reflect.RuleCompiler(scalafix.internal.reflect.RuleCompilerClasspath.defaultClasspath)
 
val mainText = """
 @main def hello: Unit = 
 println("Hello scala 3 world!")
 println(msg)
 println(2)
 println(power(2d, 0))
 println(power(2d, 1))
 println(power(2d, 2))
 println(power(2d, 3))
 println(power(2d, 35))


 def msg = "I was compiled by Scala 3 " + "..."
 inline def power(x: Double, inline n: Int): Double =
 inline if n == 0 then 1.0
 else inline if n % 2 == 1 then x * power(x, n - 1)
 else power(x * x, n / 2)
 """.stripMargin
val tmpFile = Files.createTempFile("Main-", ".scala")
val input = metaconfig.Input.VirtualFile(tmpFile.toString, mainText)
val cl = r.compile(input)
cl.isOk
// output below:
val r: scalafix.internal.reflect.RuleCompiler = scalafix.internal.reflect.RuleCompiler@33ed571e
val mainText: String = "
 @main def hello: Unit = 
 println("Hello scala 3 world!")
 println(msg)
 println(2)
 println(power(2d, 0))
 println(power(2d, 1))
 println(power(2d, 2))
 println(power(2d, 3))
 println(power(2d, 35))


 def msg = "I was compiled by Scala 3 " + "..."
 inline def power(x: Double, inline n: Int): Double =
 inline if n == 0 then 1.0
 else inline if n % 2 == 1 then x * power(x, n - 1)
 else power(x * x, n / 2)
 "
val tmpFile: java.nio.file.Path = /var/folders/8t/s8cs6f9s3p50pdf_1fy382kc0000gp/T/Main-18147230000312495277.scala
val input: metaconfig.Input.VirtualFile = Input.VirtualFile("/var/folders/8t/s8cs6f9s3p50pdf_1fy382kc0000gp/T/Main-18147230000312495277.scala", "...")
val cl: metaconfig.Configured[ClassLoader] = Ok(scala.reflect.internal.util.AbstractFileClassLoader@5bb799aa)
val res0: Boolean = true

 def tryClassload(classloader: ClassLoader, fqn: String): Option[v1.Rule] = {
 try {
 Some(toRule(classloader.loadClass(fqn)))
 } catch {
 case _: ClassNotFoundException | _: NoSuchMethodException =>
 println("catch 1")
 try {
 val clz = classloader.loadClass(fqn + "$") // here is where it fails with class not found
 Some(toRule(clz))
 } catch {
 case _: ClassNotFoundException =>
 println("catch 2")
 None
 }
 }
 }