Auto-application to `()` is deprecated. Supply the empty argument list `()` explicitly to invoke method destroySession,
or remove the empty argument list from its definition (Java-defined methods are exempt).
In Scala 3, an unapplied method like this will be eta-expanded into a function. [quickfixable]
              S.session.foreach(_.destroySession)

Lowercase el for long is not recommended because it is easy to confuse with numeral 1; use uppercase L instead [quickfixable]
          0l, 1l, true,

method any2stringadd in object Predef is deprecated (since 2.13.0): Implicit injection of + is deprecated. Convert to String to call +
  def urlFor(path: String) = baseUrl + path

type FlatSpec in package scalatest is deprecated (since 3.1.0): The org.scalatest.FlatSpec trait has been moved and renamed. Please use org.scalatest.flatspec.AnyFlatSpec instead. This can be rewritten automatically with autofix: https://github.com/scalatest/autofix/tree/master/3.1.x
class LineTokenizerTest extends FlatSpec with Matchers {

type Matchers in package scalatest is deprecated (since 3.1.0): The org.scalatest.Matchers trait has been moved and renamed. Please use org.scalatest.matchers.should.Matchers instead. This can be rewritten automatically with autofix: https://github.com/scalatest/autofix/tree/master/3.1.x
class LineTokenizerTest extends FlatSpec with Matchers {

Passing an explicit array value to a Scala varargs method is deprecated (since 2.13.0) and will result in a defensive copy; Use the more efficient non-copying ArraySeq.unsafeWrapArray or an explicit toIndexedSeq call
    this.apply(kids :_*)

method longToTimeSpan in trait TimeHelpers is deprecated (since 3.0.0): Long to TimeSpan conversion will be removed for possibility of ambiguous behaviours, use TimeSpan(in) instead if you are using in.millis
        override def lifespan = Full(LiftRules.clientActorLifespan.vend.apply(this))

method newInstance in class Class is deprecated (since 9)
      clz.getMethod(meth).invoke(clz.newInstance)

 * The {@link
 * java.lang.reflect.Constructor#newInstance(java.lang.Object...)
 * Constructor.newInstance} method avoids this problem by wrapping
 * any exception thrown by the constructor in a (checked) {@link
 * java.lang.reflect.InvocationTargetException}.
 *
 * <p>The call
 *
 * {@snippet lang="java" :
 * clazz.newInstance()
 * }
 *
 * can be replaced by
 *
 * {@snippet lang="java" :
 * clazz.getDeclaredConstructor().newInstance()
 * }

procedure syntax is deprecated: instead, add `: Unit =` to explicitly declare `boot`'s return type [quickfixable]
  def boot {

a pure expression does nothing in statement position
  def setSessionTimeout(x$1: Int): Unit = 5

shadowing a nested class of a parent is deprecated but trait Field shadows trait Field defined in trait AbstractScreen; rename the class to something else
    trait Field extends super.Field with ConfirmField {

The outer reference in this type test cannot be checked at run time.
  final case class BasicElemAttr(name: String, value: String) extends ElemAttr {

lift-web/framework/core/util/src/main/scala/net/liftweb/util/CssSel.scala:874:15
comparing values of types Double and Null using `==` will always yield false
        if (a == null) Nil else List(Text(a.toString)))

class DateMidnight in package time is deprecated
case class Dates(dt: DateTime, dm: DateMidnight)

constructor URL in class URL is deprecated (since 20)
      newUrl = new java.net.URL(url.toExternalForm.split("!")(0) + "!" + "/META-INF/MANIFEST.MF")

type Stream in package scala is deprecated (since 2.13.0): Use LazyList instead of Stream
                case StreamRoundTrip(_, func) =>