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import java.util.{Collections, Map => JavaMap} | |
import scala.collection.JavaConverters._ | |
trait EnvHacker { | |
/** | |
* Portable method for setting env vars on both *nix and Windows. | |
* @see http://stackoverflow.com/a/7201825/293064 | |
*/ | |
def setEnv(newEnv: Map[String, String]): Unit = { | |
try { |
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import Experiments_1.Q2 | |
object Experiments_1: | |
// class Q1[+T]: | |
// def enqueue(x: T): Unit = println(s"Q1 enqueued $x") | |
// val x1: Q1[Any] = new Q1[Int] | |
class Q2[-T]: | |
def enqueue(x: T): Unit = println(s"Q2 enqueued $x") |
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class Test extends AnyFlatSpec with Matchers { | |
"transformer" should "work" in { | |
// source: https://contributors.scala-lang.org/t/ability-to-force-the-caller-to-specify-a-type-parameter-for-a-polymorphic-method/2116/26 | |
sealed trait NotNothing[-T] | |
object NotNothing { | |
@implicitAmbiguous("inst() method needs a generic parameter type, which is missing") | |
implicit val nothingIsNothing = new NotNothing[Nothing]{} | |
implicit def notNothing[T] = new NotNothing[T] {} |
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/** | |
* An example of a polynomial applicative functor `1+X×X` build from two monads, 1+ and X×X, and | |
* which is not a monad. | |
* | |
* Idea: https://stackoverflow.com/questions/49742377/is-data-poe-a-empty-pair-a-a-a-monad/49742857#49742857 | |
*/ | |
object NotMonad { | |
sealed trait SquarePlusOne[+A] { | |
def map[B](f: A => B): SquarePlusOne[B] | |
} |
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#!/bin/bash | |
Try all available JDKs to find which one works for your Scala and sbt. | |
clear && printf '\e[3J' | |
function testWith(){ | |
java=$1 | |
echo Y | sdk install java "$java" | |
sdk use java "$java" | |
sbt clean test package 2>$java.log && rm $java.log && return 0 || return 1 |
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