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    # checkoutその他は省略
    - run: sbt compileなどの他のタスク色々 writeExternalDependencies
    - name: upload dependencies.txt
      if: github.event_name == 'push'
      run: |
        # いい感じにuploadとdownloadできれば、
        # github actionsのartifactでもなんでも良い。
        # 最近某所ではS3の方が便利というか楽なので、それ使ったりもしているので、その場合の例
        aws s3 cp target/dependencies.txt s3://適当なURI/${{github.ref_name}}/dependencies.txt
    - id: get_previous_dependencies

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commands += {
  def getProjects(s: State): Seq[String] = {
    val extracted = Project.extract(s)
    val currentBuildUri = extracted.currentRef.build
    val buildStructure = extracted.structure
    val buildUnitsMap = buildStructure.units
    val currentBuildUnit = buildUnitsMap(currentBuildUri)
    val projectsMap = currentBuildUnit.defined
    projectsMap.values.map(_.id).toVector
  }

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trait Functor[F[_]]
  def map      [A, B](fa: F[A])(f:   A  =>   B ): F[B]

trait Applicative[F[_]]
  def ap       [A, B](fa: F[A])(f: F[A  =>   B]): F[B]

trait Monad[F[_]]
  def bind     [A, B](fa: F[A])(f:   A  => F[B]): F[B]

trait Contravariant[F[_]]

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addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.8.18" exclude ("com.typesafe.play", "twirl-api_2.12"))

resolvers += Resolver.sbtPluginRepo("releases")

import scala.sys.process.Process

Seq(Compile, Test).map { x =>
  (x / TaskKey[File]("dependencySvg")) := {
    val output = target.value / s"dependencies-${x.name}.svg"
    Process(Seq(

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 * class org.slf4j.event.EventRecodingLogger does not have a correspondent in current version
   filter with: ProblemFilters.exclude[MissingClassProblem]("org.slf4j.event.EventRecodingLogger")
 * abstract method getMarker()org.slf4j.Marker in interface org.slf4j.event.LoggingEvent does not have a correspondent in current version
   filter with: ProblemFilters.exclude[DirectMissingMethodProblem]("org.slf4j.event.LoggingEvent.getMarker")
 * abstract method getArguments()java.util.List in interface org.slf4j.event.LoggingEvent is present only in current version
   filter with: ProblemFilters.exclude[ReversedMissingMethodProblem]("org.slf4j.event.LoggingEvent.getArguments")
 * abstract method getMarkers()java.util.List in interface org.slf4j.event.LoggingEvent is present only in current version
   filter with: ProblemFilters.exclude[ReversedMissingMethodProblem]("org.slf4j.event.LoggingEvent.getMarkers")
 * abstract method getKeyValuePairs()java.util.List in interface org.slf4j.event.LoggingEvent is present only 

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$ scala --version
Scala code runner version 2.13.10 -- Copyright 2002-2022, LAMP/EPFL and Lightbend, Inc.
$ scala -Wperformance -Xprint:jvm -e "def foo: Int = { var a = 10; @annotation.tailrec def loop(): Int = if (a == 0) 3 else { a -= 1 ; loop() } ; loop() }"
/var/folders/nz/vb2z3s8j7719gg71zgz9gj_40000gn/T/scalacmd2181293633408592115.scala:1: warning: Modification of variable a within a closure causes it to be boxed.
def foo: Int = { var a = 10; @annotation.tailrec def loop(): Int = if (a == 0) 3 else { a -= 1 ; loop() } ; loop() }
                     ^
[[syntax trees at end of                       jvm]] // scalacmd2181293633408592115.scala
package <empty> {
  object Main extends Object {
    def main(args: Array[String]): Unit = {

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package either_and_future_sample

import scalaz._
import scala.concurrent.{ExecutionContext, Future}
import scalaz.std.scalaFuture._ // for scalaz 7.1.0
// import scalaz.contrib.std.scalaFuture._ // for scalaz 7.0.x
import either_and_future_sample.Main.{UserId, context}

sealed trait Error
/** 引数であたえられたUserIdのUserが、そもそも存在しなかった場合 */

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$ scala -version
Scala code runner version 2.13.9 -- Copyright 2002-2022, LAMP/EPFL and Lightbend, Inc.
$ java -version      
openjdk version "17.0.3" 2022-04-19 LTS
OpenJDK Runtime Environment Zulu17.34+19-CA (build 17.0.3+7-LTS)
OpenJDK 64-Bit Server VM Zulu17.34+19-CA (build 17.0.3+7-LTS, mixed mode, sharing)
$ scala -release:help
Usage: -release:<release> where <release> choices are 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 (default: 17).

$ jenv shell 11      

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package example

import dotty.tools.dotc.CompilationUnit
import dotty.tools.dotc.core.Contexts.Context
import dotty.tools.dotc.core.Phases.Phase
import dotty.tools.dotc.plugins.ResearchPlugin
import dotty.tools.dotc.transform.Inlining

class InliningProfile extends ResearchPlugin {
  override val name: String = "my-inlining"

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package fix

import scalafix.Diagnostic
import scalafix.Patch
import scalafix.v1.SyntacticDocument
import scalafix.v1.SyntacticRule
import scala.meta.Term
import scalafix.lint.LintSeverity

class WrongStringInterpolation extends SyntacticRule("WrongStringInterpolation") {