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An example sbt project that compiles using Dotty

License: Creative Commons Zero v1.0 Universal

Scala 100.00%

dotty sbt epfl scala

scala3-example-project's Introduction

Example sbt project that compiles using Scala 3

Usage

This is a normal sbt project. You can start the sbt shell using sbt then compile code with compile, run the main method with run, run the tests with test and start a REPL using console.

If compiling this example project fails, you probably have a global sbt plugin that does not work with Scala 3. You might try disabling plugins in ~/.sbt/1.0/plugins and ~/.sbt/1.0.

Making a new Scala 3 project

The fastest way to start a new Scala 3 project is to use one of the following templates:

Using Scala 3 in an existing project

You will need to make the following adjustments to your build:

project/build.properties

sbt.version=1.9.9

You must use sbt 1.5.5 or newer; older versions of sbt are not supported.

build.sbt

Set the Scala 3 version:

scalaVersion := "3.4.1"

Getting your project to compile with Scala 3

For help with porting an existing Scala 2 project to Scala 3, see the Scala 3 migration guide.

Need help?

https://www.scala-lang.org/community/ has links.

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scala3-example-project's Issues

Type lambdas example not clear

I am a bit confused what this Map example shows here:
https://github.com/scala/scala3-example-project/blob/main/src/main/scala/TypeLambdas.scala#L6-L12

Since it works in Scala 2 also:
https://scalafiddle.io/sf/jjhjzwa/0

Sorry if I missed something.

SBT fails to resolve dependency: wartremover

I'm getting the following error message. By the way same error with sbt new lampepfl/dotty.g8 and sbt new lampepfl/dotty-cross.g8.

warn] ==== sonatype-releases: tried
[warn] https://oss.sonatype.org/content/repositories/releases/org/brianmckenna/wartremover_0.1/0.12/wartremover_0.1-0.12.pom
[info] Resolving org.scala-lang.modules#scala-xml_2.11;1.0.1 ...
[warn] ::::::::::::::::::::::::::::::::::::::::::::::
[warn] :: UNRESOLVED DEPENDENCIES ::
[warn] ::::::::::::::::::::::::::::::::::::::::::::::
[warn] :: org.brianmckenna#wartremover_0.1;0.12: not found
[warn] ::::::::::::::::::::::::::::::::::::::::::::::
[warn]
[warn] Note: Unresolved dependencies path:
[warn] org.brianmckenna:wartremover_0.1:0.12 ((sbt.BuildExtra) Defaults.scala#L2018)
[warn] +- dotty-example-project:dotty-example-project_0.1:0.1
sbt.ResolveException: unresolved dependency: org.brianmckenna#wartremover_0.1;0.12: not found
at sbt.IvyActions$.sbt$IvyActions$$resolve(IvyActions.scala:313)
at sbt.IvyActions$$anonfun$updateEither$1.apply(IvyActions.scala:191)
at sbt.IvyActions$$anonfun$updateEither$1.apply(IvyActions.scala:168)
at sbt.IvySbt$Module$$anonfun$withModule$1.apply(Ivy.scala:156)
at sbt.IvySbt$Module$$anonfun$withModule$1.apply(Ivy.scala:156)
at sbt.IvySbt$$anonfun$withIvy$1.apply(Ivy.scala:133)
at sbt.IvySbt.sbt$IvySbt$$action$1(Ivy.scala:57)
at sbt.IvySbt$$anon$4.call(Ivy.scala:65)
at xsbt.boot.Locks$GlobalLock.withChannel$1(Locks.scala:93)
at xsbt.boot.Locks$GlobalLock.xsbt$boot$Locks$GlobalLock$$withChannelRetries$1(Locks.scala:78)

    at xsbt.boot.Locks$GlobalLock$$anonfun$withFileLock$1.apply(Locks.scala:97)
    at xsbt.boot.Using$.withResource(Using.scala:10)
    at xsbt.boot.Using$.apply(Using.scala:9)
    at xsbt.boot.Locks$GlobalLock.ignoringDeadlockAvoided(Locks.scala:58)
    at xsbt.boot.Locks$GlobalLock.withLock(Locks.scala:48)
    at xsbt.boot.Locks$.apply0(Locks.scala:31)
    at xsbt.boot.Locks$.apply(Locks.scala:28)
    at sbt.IvySbt.withDefaultLogger(Ivy.scala:65)
    at sbt.IvySbt.withIvy(Ivy.scala:128)
    at sbt.IvySbt.withIvy(Ivy.scala:125)
    at sbt.IvySbt$Module.withModule(Ivy.scala:156)
    at sbt.IvyActions$.updateEither(IvyActions.scala:168)
    at sbt.Classpaths$$anonfun$sbt$Classpaths$$work$1$1.apply(Defaults.scala:1488)
    at sbt.Classpaths$$anonfun$sbt$Classpaths$$work$1$1.apply(Defaults.scala:1484)
    at sbt.Classpaths$$anonfun$doWork$1$1$$anonfun$121.apply(Defaults.scala:1519)
    at sbt.Classpaths$$anonfun$doWork$1$1$$anonfun$121.apply(Defaults.scala:1517)
    at sbt.Tracked$$anonfun$lastOutput$1.apply(Tracked.scala:37)
    at sbt.Classpaths$$anonfun$doWork$1$1.apply(Defaults.scala:1522)
    at sbt.Classpaths$$anonfun$doWork$1$1.apply(Defaults.scala:1516)
    at sbt.Tracked$$anonfun$inputChanged$1.apply(Tracked.scala:60)
    at sbt.Classpaths$.cachedUpdate(Defaults.scala:1539)
    at sbt.Classpaths$$anonfun$updateTask$1.apply(Defaults.scala:1466)
    at sbt.Classpaths$$anonfun$updateTask$1.apply(Defaults.scala:1418)
    at scala.Function1$$anonfun$compose$1.apply(Function1.scala:47)
    at sbt.$tilde$greater$$anonfun$$u2219$1.apply(TypeFunctions.scala:40)
    at sbt.std.Transform$$anon$4.work(System.scala:63)
    at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:228)
    at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:228)
    at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:17)
    at sbt.Execute.work(Execute.scala:237)
    at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:228)
    at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:228)
    at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:159)
    at sbt.CompletionService$$anon$2.call(CompletionService.scala:28)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

[error] (*:update) sbt.ResolveException: unresolved dependency: org.brianmckenna#wartremover_0.1;0.12: not found

upgrade to M3 and adjust code

CI told us on #46 that code adjustments will be needed

Move tests to GitHub Actions

scala 3 vs scala 2

Hi, a newbie question:
if I add println(Console.YELLOW + s"Scala version = ${util.Properties.versionString}") into Main.scala and run sbt run I got:

Scala version = 2.13.4
Trait Params example:
Hello Dotty!

...

Any idea why I'm getting 2.13.4 instead of Scala 3.0.0RC1? (the true is that I have installed Scala 2.13.4 on my local laptop)

How to use sbt plugin published in Scala 2 ?

This section described how to use normal dependencies published for Scala 2.

I think it would be great if the section also mention regarding sbt plugin, for people like me who lack of in-depth understadning sbt.

When I updated my project/plugins.sbt like below:

def dottySupport(moduleId: ModuleID): ModuleID = moduleId.withDottyCompat(scalaVersion.value)

addSbtPlugin(dottySupport("org.scala-js" % "sbt-scalajs" % "0.6.31"))
addSbtPlugin(dottySupport("org.scalameta" % "sbt-scalafmt" % "2.3.0"))

error: value withDottyCompat is not a member of sbt.ModuleID occured.

Travis CI Fails

Apparently, the failure is an infrastructural issue:

Expected feature release number in range of 9 to 13, but got: 8
The command "~/bin/install-jdk.sh --target "/home/travis/oraclejdk8" --workspace "/home/travis/.cache/install-jdk" --feature "8" --license "BCL"" failed and exited with 3 during .

Looks like Travis suddenly stopped digesting the JDK installation command.

Update Dotty to Scala 3 in README

doc link auto-parameter-tupling.html doesn't work

https://github.com/lampepfl/dotty-example-project/blob/2c1e96f4a4a0a7128e4a12690ccfba794b714fe8/src/main/scala/AutoParamTupling.scala#L3

`sbt compile` fails with global ammonite dependency

sbt compile in this project fails with the following error:

[warn]  ::::::::::::::::::::::::::::::::::::::::::::::
[warn]  ::          UNRESOLVED DEPENDENCIES         ::
[warn]  ::::::::::::::::::::::::::::::::::::::::::::::
[warn]  :: com.lihaoyi#ammonite_0.1-SNAPSHOT;0.7.0: not found
[warn]  ::::::::::::::::::::::::::::::::::::::::::::::

when I have the following in ~/.sbt/0.13/global.sbt:

libraryDependencies += "com.lihaoyi" % "ammonite" % "0.7.0" % "test" cross CrossVersion.full

It seems like the cross CrossVersion.full generates an invalid version in this case because there is no published SNAPSHOT version of ammonite?

I'm not sure if this is a bug or more of a pitfall to document. I'd be happy to make a PR adding warnings in the README if its a documentation issue.

Example usage @threadUnsafe annotation

Hi everyone.

This project include example to use lazy val field. In new proposal to Scala project have changed implementation of lazy val.

    /**
      * In order to get thread safety, you need to put @volatile before lazy vals.
      * https://dotty.epfl.ch/docs/reference/changed-features/lazy-vals-init.html
      */
    @volatile lazy val xs: List[String] = List("d", "o", "t", "t", "y")

As I understood to safe thread-safe sematics we need to attach @volatile annotation to lazy val field.

Dotty/Scala3 in std have scala.annotation.threadUnsafe annotation also. Is it still actual annotation? And if it is true in wich cases we need to use this annotation. Can you please add example?

Thank you

This is build.sbt

val dottyVersion = "3.0.0-M2"

lazy val root = project
  .in(file("."))
  .settings(
    name := "dotty-simple",
    version := "0.1.0",

    scalaVersion := dottyVersion
  )

sbt outputs the following:

/usr/lib/jvm/java-11-openjdk-amd64/bin/java -Djline.terminal=jline.UnsupportedTerminal -Dsbt.log.noformat=true -Dfile.encoding=UTF-8 -Didea.managed=true -Dfile.encoding=UTF-8 -jar /home/snet/.local/share/JetBrains/IntelliJIdea2020.3/Scala/launcher/sbt-launch.jar
[info] welcome to sbt 1.4.4 (Ubuntu Java 11.0.9.1)
[info] loading global plugins from /home/snet/.sbt/1.0/plugins
[info] loading settings for project dotty-workaround-build from plugins.sbt ...
[info] loading project definition from /home/snet/Documents/razvoj/dotty-workaround/project
[info] loading settings for project root from build.sbt,project\plugins.sbt ...
[info] set current project to dotty-simple (in build file:/home/snet/Documents/razvoj/dotty-workaround/)
[info] sbt server started at local:///home/snet/.sbt/1.0/server/026a91eb7bb819c87101/sock
[info] started sbt server
sbt:dotty-simple>
;set _root_.scala.collection.Seq(historyPath := None,shellPrompt := { _ => "" },SettingKey[_root_.scala.Option[_root_.sbt.File]]("sbtStructureOutputFile")
in _root_.sbt.Global := _root_.scala.Some(_root_.sbt.file("/tmp/sbt-structure.xml")),SettingKey[_root_.java.lang.String]("sbtStructureOptions")
in _root_.sbt.Global := "download, resolveClassifiers")
[info] Defining Global / sbtStructureOptions, Global / sbtStructureOutputFile and 1 others.
[info] The new values will be used by cleanKeepGlobs
[info] 	Run `last` for details.
[info] Reapplying settings...
[info] set current project to dotty-simple (in build file:/home/snet/Documents/razvoj/dotty-workaround/)
[info] Applying State transformations org.jetbrains.sbt.CreateTasks from /home/snet/.local/share/JetBrains/IntelliJIdea2020.3/Scala/repo/org.jetbrains/sbt-structure-extractor/scala_2.12/sbt_1.0/2020.3/jars/sbt-structure-extractor.jar
[info] Reapplying settings...
[info] set current project to dotty-simple (in build file:/home/snet/Documents/razvoj/dotty-workaround/)
[warn]
[warn] 	Note: Some unresolved dependencies have extra attributes.  Check that these dependencies exist with the requested attributes.
[warn] 		ch.epfl.lamp:sbt-dotty:0.4.6 (sbtVersion=1.0, scalaVersion=3.0.0-M2)
[warn]
[warn] 	Note: Unresolved dependencies path:
[error] stack trace is suppressed; run 'last update' for the full output
[error] stack trace is suppressed; run 'last ssExtractDependencies' for the full output
[error] (update) sbt.librarymanagement.ResolveException: Error downloading ch.epfl.lamp:sbt-dotty;sbtVersion=1.0;scalaVersion=3.0.0-M2:0.4.6
[error]   Not found
[error]   Not found
[error]   not found: /home/snet/.ivy2/local/ch.epfl.lamp/sbt-dotty/scala_3.0.0-M2/sbt_1.0/0.4.6/ivys/ivy.xml
[error]   not found: https://repo1.maven.org/maven2/ch/epfl/lamp/sbt-dotty_3.0.0-M2_1.0/0.4.6/sbt-dotty-0.4.6.pom
[error] Error downloading org.scala-lang:scala-library:3.0.0-M2
[error]   Not found
[error]   Not found
[error]   not found: /home/snet/.ivy2/local/org.scala-lang/scala-library/3.0.0-M2/ivys/ivy.xml
[error]   not found: https://repo1.maven.org/maven2/org/scala-lang/scala-library/3.0.0-M2/scala-library-3.0.0-M2.pom
[error] (ssExtractDependencies) sbt.librarymanagement.ResolveException: Error downloading ch.epfl.lamp:sbt-dotty;sbtVersion=1.0;scalaVersion=3.0.0-M2:0.4.6
[error]   Not found
[error]   Not found
[error]   not found: /home/snet/.ivy2/local/ch.epfl.lamp/sbt-dotty/scala_3.0.0-M2/sbt_1.0/0.4.6/ivys/ivy.xml
[error]   not found: https://repo1.maven.org/maven2/ch/epfl/lamp/sbt-dotty_3.0.0-M2_1.0/0.4.6/sbt-dotty-0.4.6.pom
[error] Error downloading org.scala-lang:scala-library:3.0.0-M2
[error]   Not found
[error]   Not found
[error]   not found: /home/snet/.ivy2/local/org.scala-lang/scala-library/3.0.0-M2/ivys/ivy.xml
[error]   not found: https://repo1.maven.org/maven2/org/scala-lang/scala-library/3.0.0-M2/scala-library-3.0.0-M2.pom
[error] Total time: 1 s, completed 16. dec. 2020 11:00:38
[info] shutting down sbt server

Travis fails: it takes an incorrect nightly build version

0.19.1-... is an incorrect latest build. The right latest nightly is 0.19.0-... (and tomorrow will be 0.20.0-...).

Move `scala3doc` branch to `dotty-staging/scala3-example-project`

@abgruszecki