xuwei-k

/* Example of encoding Functor/Applicative/Monad from cats with Dotty 0.15 features.
 * Derived in part from Cats -- see https://github.com/typelevel/cats/blob/master/COPYING for full license & copyright.
 */
package structures

import scala.annotation._

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

xuwei-k

import java.util.Arrays;

public class A {
  public class B {
    public class C1 {
      public C1(int a1) {}
    }

    public class C2 {
      public C2(String a1) {}

xuwei-k

object A {
  trait B {
    // include outer param in getGenericParameterTypes
    case class C1(a1: Int)
    case class C2(a1: String)
    case class C3(a1: Array[Int])

    // NOT include outer
    case class C4(a1: Option[Int])
    case class C5(a1: List[Int])

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object A {
  trait B {
    case class C(a1: Int, a2: Option[Int])
  }

  object D extends B
}

object Main {
  def main(args: Array[String]): Unit = {

xuwei-k

[error] java.lang.RuntimeException: Session not initialized.
[error] 	at scala.sys.package$.error(package.scala:30)
[error] 	at sbt.Project$.$anonfun$getOrError$1(Project.scala:441)
[error] 	at scala.Option.getOrElse(Option.scala:138)
[error] 	at sbt.Project$.getOrError(Project.scala:441)
[error] 	at sbt.Project$.session(Project.scala:447)
[error] 	at sbt.Project$.extract(Project.scala:452)
[error] 	at sbt.BuiltinCommands$.$anonfun$setParser$1(Main.scala:602)
[error] 	at sbt.Command$.$anonfun$applyEffect$3(Command.scala:144)
[error] 	at sbt.Command$.$anonfun$argParser$1(Command.scala:165)

xuwei-k

find . -name "*.scala" -exec perl -i -pe 's/⇒/=>/g' {} \;
find . -name "*.scala" -exec perl -i -pe 's/→/->/g' {} \;
find . -name "*.scala" -exec perl -i -pe 's/←/<-/g' {} \;
git commit -am "avoid deprecated unicode arrow chars

https://github.com/scala/scala/commit/9e264483d04f48513f3a82e91365667f01a2f5f3"

xuwei-k

自分もどこまで正確に把握しているのが怪しいが、知ってる限りの情報を書いておくと

• 基本的にsonatypeのreleasesとmaven centralは同じものがあるだけ(以下に例外を書いてる)
• 運営元も同じ
• 基本的に最近はsonatypeを経由してmaven centralにpublishする
• 一部例外的にapacheのものや、古いgoogleのもの(例: protobuf)で、"maven centralに存在するがsonatypeのreleasesには存在しない"ものがあった
  • 何らかの歴史的経緯か、特別扱いにより、sonatypeのreleasesを経由してmaven centralにpublishしてない
• sonatypeのreleasesにpublishされてもmaven centralに同期するのに時間がかかっていた(平均1時間前後？速いと数分。遅いと1日近く)
• "大抵のものはsonatypeを経由してpublishする" かつ、上記の "同期するのに時間がかかる" ということにより、sonatypeのreleasesのresolverを追加しておくと、publishされたばかりのものについて、maven centalに同期を待たないですぐ取得できる、というメリットだけあった
• 同期が遅れている、という要因以外で、その逆の "sonatypeのreleasesに存在するがmaven centalには存在しない" というものはなかったはず

xuwei-k

[error] GC overhead limit exceeded
[error] java.util.Arrays.copyOf(Arrays.java:3332)
[error] java.lang.AbstractStringBuilder.ensureCapacityInternal(AbstractStringBuilder.java:124)
[error] java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:649)
[error] java.lang.StringBuilder.append(StringBuilder.java:202)
[error] scala.collection.mutable.StringBuilder.append(StringBuilder.scala:266)
[error] scala.collection.mutable.StringBuilder.$plus$eq(StringBuilder.scala:174)
[error] scala.collection.mutable.StringBuilder.$plus$eq(StringBuilder.scala:30)
[error] scala.collection.generic.Growable.$anonfun$$plus$plus$eq$1(Growable.scala:58)
[error] scala.collection.generic.Growable$$Lambda$47/1002021887.apply(Unknown Source)

xuwei-k

class org.scalatest.InsertionOrderSet is declared final in scalatest_2.12-3.0.6.jar version
class org.scalatest.easymock.EasyMockSugar#MockObjects does not have a correspondent in scalatest_2.12-3.0.6.jar version
class org.scalatest.jmock.JMockCycle does not have a correspondent in scalatest_2.12-3.0.6.jar version
class org.scalatest.jmock.JMockExpectations does not have a correspondent in scalatest_2.12-3.0.6.jar version
class org.scalatest.junit.JUnit3Suite does not have a correspondent in scalatest_2.12-3.0.6.jar version
class org.scalatest.junit.JUnitRunner does not have a correspondent in scalatest_2.12-3.0.6.jar version
class org.scalatest.junit.JUnitSuite does not have a correspondent in scalatest_2.12-3.0.6.jar version
class org.scalatest.junit.JUnitTestFailedError does not have a correspondent in scalatest_2.12-3.0.6.jar version
class org.scalatest.junit.JUnitWrapperSuite does not have a correspondent in scalatest_2.12-3.0.6.jar version
class org.scalatest.junit.MyRunListener does not have a correspo

xuwei-k

scala -Ywarn-adapted-args -language:_
Welcome to Scala 2.12.8 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_192).
Type in expressions for evaluation. Or try :help.

scala> def printInt(i: Int) = println(i)
printInt: (i: Int)Unit

scala> implicit def toOneInt(is: (Int, Int)): Int = is._1 + is._2
toOneInt: (is: (Int, Int))Int