Address review

Author: liufengyun

compiler/src/dotty/tools/io/ZipArchive.scala

@@ -201,6 +201,7 @@ final class FileZipArchive(jpath: JPath) extends ZipArchive(jpath) {
   private[this] var closeables: List[java.io.Closeable] = Nil
   override def close(): Unit = {
     closeables.foreach(_.close)
+    closeables = Nil
   }
 }
 
@@ -266,5 +267,6 @@ final class ManifestResources(val url: URL) extends ZipArchive(null) {
   private[this] var closeables: List[java.io.Closeable] = Nil
   override def close(): Unit = {
     closeables.foreach(_.close())
+    closeables = Nil
   }
 }

compiler/test/dotty/tools/io/ZipArchiveTest.scala

@@ -83,8 +83,8 @@ class ZipArchiveTest {
     finally {
       archive.close()
       // The following results in IOException on Windows (file in use by another process).
-      // As jar is a temp file, it will be deleted automatically.
-      // Files.delete(jar)
+      // As jar created with Files.createTempFile, it will be deleted automatically.
+      try Files.delete(jar) catch case _: IOException => ()
     }
   }