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-Test / javaOptions += "-Dtest-database-name=sample"
+concurrentRestrictions := {
+  val par = parallelExecution.value
+  val max = EvaluateTask.SystemProcessors
+  List(
+    Tags.limitAll(if (par) max else 1),
+    Tags.limit(Tags.ForkedTestGroup, 4), // ここ増やした
+    Tags.exclusiveGroup(Tags.Clean)
+  )
+}

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53
53
53
53
53
53
53
53
53
53

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package example;

public class A {
  public static void main(String[] args) {
    var a = new java.util.concurrent.atomic.AtomicLong();
    a.compareAndSet(1L, 2L);
  }
}

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$ scala -Xsource:3
Welcome to Scala 2.13.13 -Xsource:3.0.0 (OpenJDK 64-Bit Server VM, Java 1.8.0_392).
Type in expressions for evaluation. Or try :help.

scala> def f = {
     |   val x: Boolean = ???
     | 
     |   x
     |   && x
     | }

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package example

import shapeless.nat._
import shapeless.syntax.std.tuple._

object Main{
  def main(args: Array[String]): Unit = {
    val t = (2, false, "a")
    val x = t.updateAtWith(2)(a => a :: Nil)._2

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import scala.compiletime.ops.int.*

object MapTupleNExample {
  type TupleMapN[T <: NonEmptyTuple, N <: Int, A] =
    N < Tuple.Size[T] match {
      case true =>
        Tuple.Concat[
          Tuple.Take[T, N],
          A *: Tuple.Drop[T, N + 1]
        ]

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[info] running (fork) org.openjdk.jmh.Main -i 10 -wi 10 -f1
[info] # JMH version: 1.37
[info] # VM version: JDK 23-ea, OpenJDK 64-Bit Server VM, 23-ea+7-481
[info] # VM invoker: /Library/Java/JavaVirtualMachines/jdk-23.jdk/Contents/Home/bin/java
[info] # VM options: <none>
[info] # Blackhole mode: compiler (auto-detected, use -Djmh.blackhole.autoDetect=false to disable)
[info] # Warmup: 10 iterations, 10 s each
[info] # Measurement: 10 iterations, 10 s each
[info] # Timeout: 10 min per iteration
[info] # Threads: 1 thread, will synchronize iterations

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import scala.compiletime.ops.string.Length
import scala.compiletime.ops.string.CharAt
import scala.compiletime.ops.string.Substring
import scala.compiletime.ops.int
import scala.compiletime.ops.long
import scala.language.dynamics

object Witness extends Dynamic {
  type StringTail[A <: String] = Substring[A, 1, Length[A]]

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import play.api.BuiltInComponents
import play.api.Mode
import play.api.mvc._
import play.api.routing._
import play.api.routing.sird._
import play.core.server.PekkoHttpServer
import play.core.server.ServerConfig

object Main {
  // 1つのScalaファイルで済むので、

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Welcome to Scala 2.12.18 (OpenJDK 64-Bit Server VM, Java 11.0.20).
Type in expressions for evaluation. Or try :help.

scala> val <a>{ b }</a> = <a></a>
scala.MatchError: <a></a> (of class scala.xml.Elem)
  ... 55 elided

scala> val <a>{ _ }</a> = <a>c</a>

scala> val <a>{ _* }</a> = <a>c</a>