diff --git a/compiler/src/dotty/tools/dotc/config/CompilerCommand.scala b/compiler/src/dotty/tools/dotc/config/CompilerCommand.scala
index 6158c83c4958..97649426c007 100644
--- a/compiler/src/dotty/tools/dotc/config/CompilerCommand.scala
+++ b/compiler/src/dotty/tools/dotc/config/CompilerCommand.scala
@@ -6,6 +6,7 @@ import Settings._
 import core.Contexts._
 import util.DotClass
 import Properties._
+import scala.collection.JavaConverters._
 
 object CompilerCommand extends DotClass {
 
@@ -43,10 +44,9 @@ object CompilerCommand extends DotClass {
       if (!Files.exists(path))
         throw new java.io.FileNotFoundException("argument file %s could not be found" format path.getFileName)
 
-      import scala.collection.JavaConversions._
       val lines = Files.readAllLines(path) // default to UTF-8 encoding
 
-      val params = lines map stripComment mkString " "
+      val params = lines.asScala map stripComment mkString " "
       CommandLineParser.tokenize(params)
     }
 
diff --git a/compiler/src/dotty/tools/dotc/parsing/MarkupParsers.scala b/compiler/src/dotty/tools/dotc/parsing/MarkupParsers.scala
index 706d38420ea3..882449412850 100644
--- a/compiler/src/dotty/tools/dotc/parsing/MarkupParsers.scala
+++ b/compiler/src/dotty/tools/dotc/parsing/MarkupParsers.scala
@@ -85,9 +85,9 @@ object MarkupParsers {
 
     var xEmbeddedBlock = false
 
-    private var debugLastStartElement = new mutable.Stack[(Int, String)]
-    private def debugLastPos = debugLastStartElement.top._1
-    private def debugLastElem = debugLastStartElement.top._2
+    private var debugLastStartElement = List.empty[(Int, String)]
+    private def debugLastPos = debugLastStartElement.head._1
+    private def debugLastElem = debugLastStartElement.head._2
 
     private def errorBraces() = {
       reportSyntaxError("in XML content, please use '}}' to express '}'")
@@ -280,10 +280,10 @@ object MarkupParsers {
         if (qname == "xml:unparsed")
           return xUnparsed
 
-        debugLastStartElement.push((start, qname))
+        debugLastStartElement = (start, qname) :: debugLastStartElement
         val ts = content
         xEndTag(qname)
-        debugLastStartElement.pop()
+        debugLastStartElement = debugLastStartElement.tail
         val pos = Position(start, curOffset, start)
         qname match {
           case "xml:group" => handle.group(pos, ts)
@@ -417,7 +417,7 @@ object MarkupParsers {
     def xPattern: Tree = {
       var start = curOffset
       val qname = xName
-      debugLastStartElement.push((start, qname))
+      debugLastStartElement = (start, qname) :: debugLastStartElement
       xSpaceOpt()
 
       val ts = new ArrayBuffer[Tree]
@@ -457,7 +457,7 @@ object MarkupParsers {
 
         while (doPattern) { }  // call until false
         xEndTag(qname)
-        debugLastStartElement.pop()
+        debugLastStartElement = debugLastStartElement.tail
       }
 
       handle.makeXMLpat(Position(start, curOffset, start), qname, ts)
diff --git a/compiler/test/dotty/tools/vulpix/SummaryReport.scala b/compiler/test/dotty/tools/vulpix/SummaryReport.scala
index fed36d275d5c..ee323782f29a 100644
--- a/compiler/test/dotty/tools/vulpix/SummaryReport.scala
+++ b/compiler/test/dotty/tools/vulpix/SummaryReport.scala
@@ -59,7 +59,7 @@ final class NoSummaryReport extends SummaryReporting {
  *  which outputs to a log file in `./testlogs/`
  */
 final class SummaryReport extends SummaryReporting {
-  import scala.collection.JavaConversions._
+  import scala.collection.JavaConverters._
 
   private val startingMessages = new java.util.concurrent.ConcurrentLinkedDeque[String]
   private val failedTests = new java.util.concurrent.ConcurrentLinkedDeque[String]
@@ -102,9 +102,9 @@ final class SummaryReport extends SummaryReporting {
           |""".stripMargin
     )
 
-    startingMessages.foreach(rep.append)
+    startingMessages.asScala.foreach(rep.append)
 
-    failedTests.map(x => s"    $x\n").foreach(rep.append)
+    failedTests.asScala.map(x => s"    $x\n").foreach(rep.append)
 
     // If we're compiling locally, we don't need instructions on how to
     // reproduce failures
@@ -121,7 +121,7 @@ final class SummaryReport extends SummaryReporting {
 
     rep += '\n'
 
-    reproduceInstructions.foreach(rep.append)
+    reproduceInstructions.asScala.foreach(rep.append)
 
     // If we're on the CI, we want everything
     if (!isInteractive) println(rep.toString)
@@ -129,7 +129,7 @@ final class SummaryReport extends SummaryReporting {
     TestReporter.logPrintln(rep.toString)
 
     // Perform cleanup callback:
-    if (cleanUps.nonEmpty) cleanUps.foreach(_.apply())
+    if (!cleanUps.isEmpty()) cleanUps.asScala.foreach(_.apply())
   }
 
   private def removeColors(msg: String): String =