Fix traversing jar files with tasty inspector

Author: BarkingBad

compiler/src/dotty/tools/dotc/fromtasty/TASTYRun.scala

@@ -4,6 +4,7 @@ package fromtasty
 
 import io.{JarArchive, AbstractFile, Path}
 import core.Contexts._
+import java.io.File
 
 class TASTYRun(comp: Compiler, ictx: Context) extends Run(comp, ictx) {
   override def compile(files: List[AbstractFile]): Unit = {
@@ -18,8 +19,9 @@ class TASTYRun(comp: Compiler, ictx: Context) extends Run(comp, ictx) {
       file.extension match
         case "jar" =>
           JarArchive.open(Path(file.path), create = false).allFileNames()
+            .map(_.stripPrefix(File.separator)) // change paths from absolute to relative
             .filter(e => Path.extension(e) == "tasty" && !fromTastyIgnoreList(e))
-            .map(e => e.stripSuffix(".tasty").replace("/", "."))
+            .map(e => e.stripSuffix(".tasty").replace(File.separator, "."))
             .toList
         case "tasty" => TastyFileUtil.getClassName(file)
         case _ =>