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object RuntimeUtils {
  def requestThreadDump: String = {
    // Get the PID of the current JVM process
    val selfName = java.lang.management.ManagementFactory.getRuntimeMXBean().getName()
    val selfPid = selfName.substring(0, selfName.indexOf('@'))

    // Attach to the VM
    import com.sun.tools.attach.VirtualMachine
    import sun.tools.attach.HotSpotVirtualMachine;
    val vm = VirtualMachine.attach(selfPid);

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前提や問題点の説明

• sbt-sonatypeのversion 3.8時点の話
• 最近のsbt-sonatypeは、一旦全部ローカルの特定のディレクトリにjarやpomをpublishして、それをまとめてuploadするという、bundle releaseという方式が導入された
• sonatypeBundleDirectoryはその際のディレクトリのためのSetting Key
• "まとめてupload" なので、もちろん基本的には、一つのディレクトリに全部一旦publishして、1回だけuploadするのが通常の使い方として想定されているはず
• (なぜか同名の未使用のTaskKeyが定義されているが？)sonatypeBundleReleaseはcommandとして定義されている https://github.com/xerial/sbt-sonatype/blob/3.8/src/main/scala/xerial/sbt/Sonatype.scala#L144-L145
• SettingKeyやTaskKeyは、sub project毎に違う値や動作を持てる。一方Commandは、(単純に言えば)指定されたものを順次sbtのconsoleから実行するイメージに近い
• versionもSettingKey
• つまり、sonatypeBundleDirectoryの値は、versionを使って定義されているが、sub project毎にversionが違えば、sonatypeBundleDirectoryの値も異なることになるはず

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package example

case class IO[A](private val run: () => A) {
  def unsafeRun(): A = run()
  def map[B](f: A => B): IO[B] = IO(() => f(run()))
  def flatMap[B](f: A => IO[B]): IO[B] = IO(() => f(run()).run())
}

case class Ref[A](private var value: A) {
  def get: IO[A] = IO(() => value)

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package example

import cats.effect.concurrent.Ref
import cats.effect._
import cats.syntax.traverse._
import cats.instances.list._

// https://github.com/typelevel/cats-effect/blob/v2.0.0/core/shared/src/main/scala/cats/effect/concurrent/Ref.scala#L208
object CatsRefUnsafeExample extends IOApp {
  override def run(args: List[String]) = {

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val runAll = taskKey[Unit]("run all main") 

runAllIn(Compile)

def runAllIn(config: Configuration) = {
  runAll in config := {
    val r = (runner in run).value
    val classpath = (fullClasspath in config).value
    val log = streams.value.log
    (discoveredMainClasses in config).value.foreach(c =>

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 * abstract method result(scala.concurrent.duration.Duration,scala.concurrent.CanAwait)java.lang.Object in interface scala.concurrent.Awaitable has a different signature in current version, where it is (Lscala/concurrent/duration/Duration;Lscala/concurrent/CanAwait;)TT;^Ljava/util/concurrent/TimeoutException;^Ljava/lang/InterruptedException; rather than (Lscala/concurrent/duration/Duration;Lscala/concurrent/CanAwait;)TT;^Ljava/lang/Exception;
   filter with: ProblemFilters.exclude[IncompatibleSignatureProblem]("scala.concurrent.Awaitable.result")
 * static method result(scala.concurrent.Awaitable,scala.concurrent.duration.Duration)java.lang.Object in class scala.concurrent.Await has a different signature in current version, where it is <T:Ljava/lang/Object;>(Lscala/concurrent/Awaitable<TT;>;Lscala/concurrent/duration/Duration;)TT;^Ljava/util/concurrent/TimeoutException;^Ljava/lang/InterruptedException; rather than <T:Ljava/lang/Object;>(Lscala/concurrent/Awaitable<TT;>;Lscala/concurrent/duration/Duration;)TT;

xuwei-k

Classfile /Users/kenji/structural-subtype-javap/A.class
  Last modified Aug 12, 2019; size 2453 bytes
  MD5 checksum dc2e1948b339005c82b1948b25e9356f
  Compiled from "A.scala"
public class A
  minor version: 0
  major version: 52
  flags: ACC_PUBLIC, ACC_SUPER
Constant pool:
    #1 = Utf8               A

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Classfile /Users/kenji/boolean-plus-string/A.class
  Last modified Aug 11, 2019; size 1859 bytes
  MD5 checksum 45a441997ea15f8a84c80f23f1f0bfe1
  Compiled from "A.scala"
public class A
  minor version: 0
  major version: 52
  flags: ACC_PUBLIC, ACC_SUPER
Constant pool:
   #1 = Utf8               A

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// https://github.com/xuwei-k/replace-symbol-literals

{
  val Scalafix = "Scalafix"
  val removeCommand = "removeTemporaryScalafix"

  def tempPluginDotSbtFile (base: File) =
    base / "project" / ("temporaryScalafix.sbt")

  Seq(

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package scala_guice_macro

import com.google.inject.Injector
import scala.reflect.macros.blackbox
import scala.language.experimental.macros

object InjectorOps {
  implicit def toInjectorOps(i: Injector): InjectorOps = new InjectorOps(i)
}