diff --git a/.drone.yml b/.drone.yml
index 1f0d07204ca8..96bbc3c3e2ba 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -11,7 +11,6 @@ pipeline:
     image: lampepfl/dotty:24-04-2017
     pull: true
     commands:
-      - ln -s /var/cache/drone/ivy2 "$HOME/.ivy2"
       - ./project/scripts/sbt "${CI_TEST}"
     when:
       branch:
diff --git a/compiler/src/dotty/tools/dotc/transform/Erasure.scala b/compiler/src/dotty/tools/dotc/transform/Erasure.scala
index 9bb783ddc776..e3e1fd9f8da2 100644
--- a/compiler/src/dotty/tools/dotc/transform/Erasure.scala
+++ b/compiler/src/dotty/tools/dotc/transform/Erasure.scala
@@ -234,9 +234,7 @@ object Erasure extends TypeTestsCasts{
      *  in ExtensionMethods#transform.
      */
     def cast(tree: Tree, pt: Type)(implicit ctx: Context): Tree = {
-      // TODO: The commented out assertion fails for tailcall/t6574.scala
-      //       Fix the problem and enable the assertion.
-      // assert(!pt.isInstanceOf[SingletonType], pt)
+      assert(!pt.isInstanceOf[SingletonType], pt)
       if (pt isRef defn.UnitClass) unbox(tree, pt)
       else (tree.tpe, pt) match {
         case (JavaArrayType(treeElem), JavaArrayType(ptElem))
diff --git a/project/scripts/sbt b/project/scripts/sbt
index 5773b444a118..d9c12d004f87 100755
--- a/project/scripts/sbt
+++ b/project/scripts/sbt
@@ -13,6 +13,10 @@ else
 fi
 
 if [ $SHOULD_RUN = true ]; then
+  # get the ivy2 cache:
+  ln -s /var/cache/drone/ivy2 "$HOME/.ivy2" || true
+
+  # run sbt with the supplied arg:
   sbt -J-Xmx4096m \
       -J-XX:ReservedCodeCacheSize=512m \
       -J-XX:MaxMetaspaceSize=1024m \
diff --git a/project/scripts/sbtPublish b/project/scripts/sbtPublish
index 29f946e09ac6..2224d998036f 100755
--- a/project/scripts/sbtPublish
+++ b/project/scripts/sbtPublish
@@ -14,21 +14,20 @@ if [ $SHOULD_RUN = false ]; then
   exit 0
 fi
 
-if [ -z "$SONATYPE_USER" -o -z "$SONATYPE_PW" -o -z "$PGP_PW" ]; then
+if [ -z "$2" -o -z "$3" -o -z "$4" ]; then
     echo "invalid args: this script takes 4 args, usage:"
     echo ""
     echo "    ./project/scripts/sbt SHOULD_RUN SONATYPE_USER SONATYPE_PW PGP_PW"
     exit 1
 fi
 
-CMD='     ;set credentials += Credentials("Sonatype Nexus Repository Manager", "oss.sonatype.org", "'"$SONATYPE_USER"'", "'"$SONATYPE_PW"'")'
-CMD="$CMD ;set pgpPassphrase := Some(\"\"\"$PGP_PW\"\"\".toCharArray)"
+CMD='     ;set credentials += Credentials("Sonatype Nexus Repository Manager", "oss.sonatype.org", "'"$2"'", "'"$3"'")'
+CMD="$CMD ;set pgpPassphrase := Some(\"\"\"$4\"\"\".toCharArray)"
 CMD="$CMD ;set pgpSecretRing := file(\"/keys/secring.asc\")"
 CMD="$CMD ;set pgpPublicRing := file(\"/keys/pubring.asc\")"
 CMD="$CMD ;dotty-bootstrapped/publishSigned ;sonatypeRelease"
 
-echo "Will run sbt with command: \"$CMD\""
-
+export NIGHTLYBUILD="yes"
 sbt -J-Xmx4096m \
     -J-XX:ReservedCodeCacheSize=512m \
     -J-XX:MaxMetaspaceSize=1024m \