Scala3 出ましたね。コチラのページにある Try it now をやって、早速インストールしてみましょう。
インストール
Mac の場合 brew でインストールできるようです
% brew install lampepfl/brew/dotty
...
==> Installing dotty from lampepfl/brew
==> Downloading https://github.com/lampepfl/dotty/releases/download/3.0.0/scala3
==> Downloading from https://github-releases.githubusercontent.com/7035651/8e8e1
######################################################################## 100.0%
xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun
Error: An exception occurred within a child process:
CompilerSelectionError: lampepfl/brew/dotty cannot be built with any available compilers.
Install GNU's GCC:
brew install gcc
おやおや、 command line tools が必要なようです。下記コマンドを実行して、表示されたポップアップで同意するとインストールされます。
% xcode-select --install
改めてインストール
% brew install lampepfl/brew/dotty
...
==> Installing dotty from lampepfl/brew
==> Downloading https://github.com/lampepfl/dotty/releases/download/3.0.0/scala3
Already downloaded: ~/Library/Caches/Homebrew/downloads/b52826048b9eb57afa9ef5eb4a4409c759f5a4a3a6cce36fb031487e85bf558c--scala3-3.0.0.tar.gz
Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/local
Could not symlink bin/scala
Target /usr/local/bin/scala
is a symlink belonging to scala. You can unlink it:
brew unlink scala
To force the link and overwrite all conflicting files:
brew link --overwrite dotty
To list all files that would be deleted:
brew link --overwrite --dry-run dotty
Possible conflicting files are:
/usr/local/bin/scala -> /usr/local/Cellar/scala/2.13.5/bin/scala
/usr/local/bin/scalac -> /usr/local/Cellar/scala/2.13.5/bin/scalac
/usr/local/bin/scaladoc -> /usr/local/Cellar/scala/2.13.5/bin/scaladoc
==> Summary
🍺 /usr/local/Cellar/dotty/3.0.0: 50 files, 31.5MB, built in 3 seconds
すでに 2.13 がインストールされてるからだめって言われましたね。。。
% brew unlink scala
Unlinking /usr/local/Cellar/scala/2.13.5... 11 symlinks removed.
% brew install lampepfl/brew/dotty
Warning: lampepfl/brew/dotty 3.0.0 is already installed, it's just not linked.
To link this version, run:
brew link dotty
% brew link dotty
Linking /usr/local/Cellar/dotty/3.0.0... 48 symlinks created.
% scalac --version
Scala compiler version 3.0.0 -- Copyright 2002-2021, LAMP/EPFL
よし、いけたっぽいですね。
プロジェクトの作成
プロジェクトの生成は sbt でやるようです
% mkdir test
% cd test
% sbt new scala/scala3.g8
zsh: command not found: sbt
うーむ... sbt も brew で入れましょう
% brew install sbt
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 1 tap (homebrew/cask).
==> Updated Casks
Updated 1 cask.
==> Downloading https://ghcr.io/v2/homebrew/core/sbt/manifests/1.5.2
######################################################################## 100.0%
==> Downloading https://ghcr.io/v2/homebrew/core/sbt/blobs/sha256:97d2ea0187ad1c
==> Downloading from https://pkg-containers.githubusercontent.com/ghcr1/blobs/sh
######################################################################## 100.0%
==> Pouring sbt--1.5.2.all.bottle.tar.gz
==> Caveats
You can use $SBT_OPTS to pass additional JVM options to sbt.
Project specific options should be placed in .sbtopts in the root of your project.
Global settings should be placed in /usr/local/etc/sbtopts
==> Summary
🍺 /usr/local/Cellar/sbt/1.5.2: 13 files, 50.7MB
改めてプロジェクトを作成します。
% sbt new scala/scala3.g8
copying runtime jar...
[info] [launcher] getting org.scala-sbt sbt 1.5.2 (this may take some time)...
[info] [launcher] getting Scala 2.12.13 (for sbt)...
[info] welcome to sbt 1.5.2 (N/A Java 15.0.2)
[info] set current project to new (in build file:/private/var/folders/nf/wnm__wgn16vgswm89npfm9jw0000gn/T/sbt_f3f3a50f/new/)
[info] downloading https://repo1.maven.org/maven2/org/scala-sbt/sbt-giter8-resolver/sbt-giter8-resolver_2.12/0.13.1/sbt-giter8-resolver_2.12-0.13.1.jar ...
[info] downloading https://repo1.maven.org/maven2/org/foundweekends/giter8/giter8-launcher_2.12/0.13.1/giter8-launcher_2.12-0.13.1.jar ...
[info] downloading https://repo1.maven.org/maven2/org/scala-sbt/template-resolver/0.1/template-resolver-0.1.jar ...
[info] downloading https://repo1.maven.org/maven2/org/foundweekends/giter8/giter8-cli-git_2.12/0.13.1/giter8-cli-git_2.12-0.13.1.jar ...
[info] downloading https://repo1.maven.org/maven2/io/get-coursier/coursier_2.12/2.0.0-RC6-20/coursier_2.12-2.0.0-RC6-20.jar ...
[info] downloading https://repo1.maven.org/maven2/org/scala-lang/scala-library/2.12.13/scala-library-2.12.13.jar ...
[info] [SUCCESSFUL ] org.scala-sbt.sbt-giter8-resolver#sbt-giter8-resolver_2.12;0.13.1!sbt-giter8-resolver_2.12.jar (475ms)
[info] downloading https://repo1.maven.org/maven2/com/github/scopt/scopt_2.12/3.7.1/scopt_2.12-3.7.1.jar ...
[info] [SUCCESSFUL ] org.foundweekends.giter8#giter8-launcher_2.12;0.13.1!giter8-launcher_2.12.jar (741ms)
[info] downloading https://repo1.maven.org/maven2/org/eclipse/jgit/org.eclipse.jgit.pgm/5.8.0.202006091008-r/org.eclipse.jgit.pgm-5.8.0.202006091008-r.jar ...
[info] [SUCCESSFUL ] org.scala-sbt#template-resolver;0.1!template-resolver.jar (771ms)
[info] downloading https://repo1.maven.org/maven2/com/jcraft/jsch.agentproxy.jsch/0.0.9/jsch.agentproxy.jsch-0.0.9.jar ...
[info] [SUCCESSFUL ] org.foundweekends.giter8#giter8-cli-git_2.12;0.13.1!giter8-cli-git_2.12.jar (886ms)
[info] downloading https://repo1.maven.org/maven2/com/jcraft/jsch.agentproxy.sshagent/0.0.9/jsch.agentproxy.sshagent-0.0.9.jar ...
[info] [SUCCESSFUL ] com.github.scopt#scopt_2.12;3.7.1!scopt_2.12.jar (491ms)
[info] downloading https://repo1.maven.org/maven2/com/jcraft/jsch.agentproxy.connector-factory/0.0.9/jsch.agentproxy.connector-factory-0.0.9.jar ...
[info] [SUCCESSFUL ] com.jcraft#jsch.agentproxy.jsch;0.0.9!jsch.agentproxy.jsch.jar (466ms)
[info] downloading https://repo1.maven.org/maven2/org/eclipse/jgit/org.eclipse.jgit.ssh.jsch/5.8.0.202006091008-r/org.eclipse.jgit.ssh.jsch-5.8.0.202006091008-r.jar ...
[info] [SUCCESSFUL ] com.jcraft#jsch.agentproxy.sshagent;0.0.9!jsch.agentproxy.sshagent.jar(bundle) (459ms)
[info] downloading https://repo1.maven.org/maven2/commons-io/commons-io/2.6/commons-io-2.6.jar ...
[info] [SUCCESSFUL ] org.eclipse.jgit#org.eclipse.jgit.pgm;5.8.0.202006091008-r!org.eclipse.jgit.pgm.jar (742ms)
[info] downloading https://repo1.maven.org/maven2/args4j/args4j/2.33/args4j-2.33.jar ...
[info] [SUCCESSFUL ] com.jcraft#jsch.agentproxy.connector-factory;0.0.9!jsch.agentproxy.connector-factory.jar(bundle) (583ms)
[info] downloading https://repo1.maven.org/maven2/org/apache/commons/commons-compress/1.19/commons-compress-1.19.jar ...
[info] [SUCCESSFUL ] org.scala-lang#scala-library;2.12.13!scala-library.jar (1605ms)
[info] downloading https://repo1.maven.org/maven2/org/eclipse/jgit/org.eclipse.jgit.archive/5.8.0.202006091008-r/org.eclipse.jgit.archive-5.8.0.202006091008-r.jar ...
[info] [SUCCESSFUL ] org.eclipse.jgit#org.eclipse.jgit.ssh.jsch;5.8.0.202006091008-r!org.eclipse.jgit.ssh.jsch.jar (512ms)
[info] downloading https://repo1.maven.org/maven2/org/eclipse/jgit/org.eclipse.jgit/5.8.0.202006091008-r/org.eclipse.jgit-5.8.0.202006091008-r.jar ...
[info] [SUCCESSFUL ] commons-io#commons-io;2.6!commons-io.jar (602ms)
[info] downloading https://repo1.maven.org/maven2/org/eclipse/jgit/org.eclipse.jgit.ui/5.8.0.202006091008-r/org.eclipse.jgit.ui-5.8.0.202006091008-r.jar ...
[info] [SUCCESSFUL ] args4j#args4j;2.33!args4j.jar(bundle) (469ms)
[info] downloading https://repo1.maven.org/maven2/org/eclipse/jgit/org.eclipse.jgit.gpg.bc/5.8.0.202006091008-r/org.eclipse.jgit.gpg.bc-5.8.0.202006091008-r.jar ...
[info] [SUCCESSFUL ] org.eclipse.jgit#org.eclipse.jgit.archive;5.8.0.202006091008-r!org.eclipse.jgit.archive.jar (453ms)
[info] downloading https://repo1.maven.org/maven2/org/eclipse/jgit/org.eclipse.jgit.http.apache/5.8.0.202006091008-r/org.eclipse.jgit.http.apache-5.8.0.202006091008-r.jar ...
[info] [SUCCESSFUL ] org.apache.commons#commons-compress;1.19!commons-compress.jar (697ms)
[info] downloading https://repo1.maven.org/maven2/org/eclipse/jgit/org.eclipse.jgit.ssh.apache/5.8.0.202006091008-r/org.eclipse.jgit.ssh.apache-5.8.0.202006091008-r.jar ...
[info] [SUCCESSFUL ] org.eclipse.jgit#org.eclipse.jgit.gpg.bc;5.8.0.202006091008-r!org.eclipse.jgit.gpg.bc.jar (449ms)
[info] downloading https://repo1.maven.org/maven2/org/apache/httpcomponents/httpclient/4.5.10/httpclient-4.5.10.jar ...
[info] [SUCCESSFUL ] org.eclipse.jgit#org.eclipse.jgit.ui;5.8.0.202006091008-r!org.eclipse.jgit.ui.jar (455ms)
[info] downloading https://repo1.maven.org/maven2/org/slf4j/slf4j-api/1.7.2/slf4j-api-1.7.2.jar ...
[info] [SUCCESSFUL ] org.eclipse.jgit#org.eclipse.jgit.http.apache;5.8.0.202006091008-r!org.eclipse.jgit.http.apache.jar (455ms)
[info] downloading https://repo1.maven.org/maven2/org/slf4j/slf4j-log4j12/1.7.2/slf4j-log4j12-1.7.2.jar ...
[info] [SUCCESSFUL ] org.eclipse.jgit#org.eclipse.jgit.ssh.apache;5.8.0.202006091008-r!org.eclipse.jgit.ssh.apache.jar (466ms)
[info] downloading https://repo1.maven.org/maven2/log4j/log4j/1.2.15/log4j-1.2.15.jar ...
[info] [SUCCESSFUL ] org.eclipse.jgit#org.eclipse.jgit;5.8.0.202006091008-r!org.eclipse.jgit.jar (1078ms)
[info] downloading https://repo1.maven.org/maven2/org/eclipse/jetty/jetty-servlet/9.4.28.v20200408/jetty-servlet-9.4.28.v20200408.jar ...
[info] [SUCCESSFUL ] org.slf4j#slf4j-api;1.7.2!slf4j-api.jar (465ms)
[info] downloading https://repo1.maven.org/maven2/org/eclipse/jgit/org.eclipse.jgit.lfs/5.8.0.202006091008-r/org.eclipse.jgit.lfs-5.8.0.202006091008-r.jar ...
[info] [SUCCESSFUL ] org.apache.httpcomponents#httpclient;4.5.10!httpclient.jar (484ms)
[info] downloading https://repo1.maven.org/maven2/org/eclipse/jgit/org.eclipse.jgit.lfs.server/5.8.0.202006091008-r/org.eclipse.jgit.lfs.server-5.8.0.202006091008-r.jar ...
[info] [SUCCESSFUL ] org.slf4j#slf4j-log4j12;1.7.2!slf4j-log4j12.jar (451ms)
[info] downloading https://repo1.maven.org/maven2/org/osgi/org.osgi.core/4.3.1/org.osgi.core-4.3.1.jar ...
[info] [SUCCESSFUL ] log4j#log4j;1.2.15!log4j.jar (477ms)
[info] downloading https://repo1.maven.org/maven2/com/googlecode/javaewah/JavaEWAH/1.1.7/JavaEWAH-1.1.7.jar ...
[info] [SUCCESSFUL ] org.eclipse.jetty#jetty-servlet;9.4.28.v20200408!jetty-servlet.jar (470ms)
[info] downloading https://repo1.maven.org/maven2/org/bouncycastle/bcpg-jdk15on/1.65/bcpg-jdk15on-1.65.jar ...
[info] [SUCCESSFUL ] org.eclipse.jgit#org.eclipse.jgit.lfs;5.8.0.202006091008-r!org.eclipse.jgit.lfs.jar (458ms)
[info] downloading https://repo1.maven.org/maven2/org/bouncycastle/bcprov-jdk15on/1.65.01/bcprov-jdk15on-1.65.01.jar ...
[info] [SUCCESSFUL ] org.eclipse.jgit#org.eclipse.jgit.lfs.server;5.8.0.202006091008-r!org.eclipse.jgit.lfs.server.jar (462ms)
[info] downloading https://repo1.maven.org/maven2/org/bouncycastle/bcpkix-jdk15on/1.65/bcpkix-jdk15on-1.65.jar ...
[info] [SUCCESSFUL ] org.osgi#org.osgi.core;4.3.1!org.osgi.core.jar (474ms)
[info] downloading https://repo1.maven.org/maven2/org/apache/httpcomponents/httpcore/4.4.12/httpcore-4.4.12.jar ...
[info] [SUCCESSFUL ] com.googlecode.javaewah#JavaEWAH;1.1.7!JavaEWAH.jar(bundle) (486ms)
[info] downloading https://repo1.maven.org/maven2/commons-logging/commons-logging/1.2/commons-logging-1.2.jar ...
[info] [SUCCESSFUL ] org.bouncycastle#bcpg-jdk15on;1.65!bcpg-jdk15on.jar (468ms)
[info] downloading https://repo1.maven.org/maven2/commons-codec/commons-codec/1.11/commons-codec-1.11.jar ...
[info] [SUCCESSFUL ] org.bouncycastle#bcpkix-jdk15on;1.65!bcpkix-jdk15on.jar (483ms)
[info] downloading https://repo1.maven.org/maven2/org/apache/sshd/sshd-osgi/2.4.0/sshd-osgi-2.4.0.jar ...
[info] [SUCCESSFUL ] org.apache.httpcomponents#httpcore;4.4.12!httpcore.jar (488ms)
[info] downloading https://repo1.maven.org/maven2/org/apache/sshd/sshd-sftp/2.4.0/sshd-sftp-2.4.0.jar ...
[info] [SUCCESSFUL ] commons-logging#commons-logging;1.2!commons-logging.jar (454ms)
[info] downloading https://repo1.maven.org/maven2/net/i2p/crypto/eddsa/0.3.0/eddsa-0.3.0.jar ...
[info] [SUCCESSFUL ] org.bouncycastle#bcprov-jdk15on;1.65.01!bcprov-jdk15on.jar (896ms)
[info] downloading https://repo1.maven.org/maven2/org/apache/sshd/sshd-core/2.4.0/sshd-core-2.4.0.jar ...
[info] [SUCCESSFUL ] commons-codec#commons-codec;1.11!commons-codec.jar (471ms)
[info] downloading https://repo1.maven.org/maven2/org/apache/sshd/sshd-common/2.4.0/sshd-common-2.4.0.jar ...
[info] [SUCCESSFUL ] org.apache.sshd#sshd-osgi;2.4.0!sshd-osgi.jar (508ms)
[info] downloading https://repo1.maven.org/maven2/com/jcraft/jsch/0.1.55/jsch-0.1.55.jar ...
[info] [SUCCESSFUL ] org.apache.sshd#sshd-sftp;2.4.0!sshd-sftp.jar (474ms)
[info] downloading https://repo1.maven.org/maven2/com/jcraft/jzlib/1.1.1/jzlib-1.1.1.jar ...
[info] [SUCCESSFUL ] net.i2p.crypto#eddsa;0.3.0!eddsa.jar(bundle) (463ms)
[info] downloading https://repo1.maven.org/maven2/javax/mail/mail/1.4/mail-1.4.jar ...
[info] [SUCCESSFUL ] org.apache.sshd#sshd-core;2.4.0!sshd-core.jar (484ms)
[info] downloading https://repo1.maven.org/maven2/javax/activation/activation/1.1/activation-1.1.jar ...
[info] [SUCCESSFUL ] org.apache.sshd#sshd-common;2.4.0!sshd-common.jar (485ms)
[info] downloading https://repo1.maven.org/maven2/org/eclipse/jetty/jetty-security/9.4.28.v20200408/jetty-security-9.4.28.v20200408.jar ...
[info] [SUCCESSFUL ] com.jcraft#jsch;0.1.55!jsch.jar (468ms)
[info] downloading https://repo1.maven.org/maven2/org/eclipse/jetty/jetty-server/9.4.28.v20200408/jetty-server-9.4.28.v20200408.jar ...
[info] [SUCCESSFUL ] com.jcraft#jzlib;1.1.1!jzlib.jar (448ms)
[info] downloading https://repo1.maven.org/maven2/javax/servlet/javax.servlet-api/3.1.0/javax.servlet-api-3.1.0.jar ...
[info] [SUCCESSFUL ] javax.activation#activation;1.1!activation.jar (451ms)
[info] downloading https://repo1.maven.org/maven2/org/eclipse/jetty/jetty-http/9.4.28.v20200408/jetty-http-9.4.28.v20200408.jar ...
[info] [SUCCESSFUL ] javax.mail#mail;1.4!mail.jar (566ms)
[info] downloading https://repo1.maven.org/maven2/org/eclipse/jetty/jetty-io/9.4.28.v20200408/jetty-io-9.4.28.v20200408.jar ...
[info] [SUCCESSFUL ] org.eclipse.jetty#jetty-security;9.4.28.v20200408!jetty-security.jar (466ms)
[info] downloading https://repo1.maven.org/maven2/org/eclipse/jetty/jetty-util/9.4.28.v20200408/jetty-util-9.4.28.v20200408.jar ...
[info] [SUCCESSFUL ] javax.servlet#javax.servlet-api;3.1.0!javax.servlet-api.jar (452ms)
[info] downloading https://repo1.maven.org/maven2/com/google/code/gson/gson/2.8.2/gson-2.8.2.jar ...
[info] [SUCCESSFUL ] org.eclipse.jetty#jetty-server;9.4.28.v20200408!jetty-server.jar (494ms)
[info] downloading https://repo1.maven.org/maven2/com/jcraft/jsch.agentproxy.core/0.0.9/jsch.agentproxy.core-0.0.9.jar ...
[info] [SUCCESSFUL ] org.eclipse.jetty#jetty-io;9.4.28.v20200408!jetty-io.jar (450ms)
[info] downloading https://repo1.maven.org/maven2/com/jcraft/jsch.agentproxy.usocket-jna/0.0.9/jsch.agentproxy.usocket-jna-0.0.9.jar ...
[info] [SUCCESSFUL ] org.eclipse.jetty#jetty-http;9.4.28.v20200408!jetty-http.jar (462ms)
[info] downloading https://repo1.maven.org/maven2/com/jcraft/jsch.agentproxy.usocket-nc/0.0.9/jsch.agentproxy.usocket-nc-0.0.9.jar ...
[info] [SUCCESSFUL ] org.eclipse.jetty#jetty-util;9.4.28.v20200408!jetty-util.jar (467ms)
[info] downloading https://repo1.maven.org/maven2/com/jcraft/jsch.agentproxy.pageant/0.0.9/jsch.agentproxy.pageant-0.0.9.jar ...
[info] [SUCCESSFUL ] com.jcraft#jsch.agentproxy.core;0.0.9!jsch.agentproxy.core.jar(bundle) (454ms)
[info] downloading https://repo1.maven.org/maven2/net/java/dev/jna/jna/4.1.0/jna-4.1.0.jar ...
[info] [SUCCESSFUL ] com.google.code.gson#gson;2.8.2!gson.jar (467ms)
[info] downloading https://repo1.maven.org/maven2/net/java/dev/jna/jna-platform/4.1.0/jna-platform-4.1.0.jar ...
[info] [SUCCESSFUL ] com.jcraft#jsch.agentproxy.usocket-jna;0.0.9!jsch.agentproxy.usocket-jna.jar(bundle) (442ms)
[info] downloading https://repo1.maven.org/maven2/io/get-coursier/coursier-core_2.12/2.0.0-RC6-20/coursier-core_2.12-2.0.0-RC6-20.jar ...
[info] [SUCCESSFUL ] com.jcraft#jsch.agentproxy.usocket-nc;0.0.9!jsch.agentproxy.usocket-nc.jar(bundle) (451ms)
[info] downloading https://repo1.maven.org/maven2/io/get-coursier/coursier-cache_2.12/2.0.0-RC6-20/coursier-cache_2.12-2.0.0-RC6-20.jar ...
[info] [SUCCESSFUL ] com.jcraft#jsch.agentproxy.pageant;0.0.9!jsch.agentproxy.pageant.jar(bundle) (456ms)
[info] downloading https://repo1.maven.org/maven2/com/github/alexarchambault/argonaut-shapeless_6.2_2.12/1.2.0-M12/argonaut-shapeless_6.2_2.12-1.2.0-M12.jar ...
[info] [SUCCESSFUL ] net.java.dev.jna#jna-platform;4.1.0!jna-platform.jar (505ms)
[info] downloading https://repo1.maven.org/maven2/io/get-coursier/coursier-util_2.12/2.0.0-RC6-20/coursier-util_2.12-2.0.0-RC6-20.jar ...
[info] [SUCCESSFUL ] net.java.dev.jna#jna;4.1.0!jna.jar (575ms)
[info] downloading https://repo1.maven.org/maven2/org/scala-lang/modules/scala-xml_2.12/1.3.0/scala-xml_2.12-1.3.0.jar ...
[info] [SUCCESSFUL ] io.get-coursier#coursier-core_2.12;2.0.0-RC6-20!coursier-core_2.12.jar (483ms)
[info] downloading https://repo1.maven.org/maven2/io/github/alexarchambault/windows-ansi/windows-ansi/0.0.3/windows-ansi-0.0.3.jar ...
[info] [SUCCESSFUL ] io.get-coursier#coursier-cache_2.12;2.0.0-RC6-20!coursier-cache_2.12.jar (474ms)
[info] downloading https://repo1.maven.org/maven2/org/fusesource/jansi/jansi/1.18/jansi-1.18.jar ...
[info] [SUCCESSFUL ] com.github.alexarchambault#argonaut-shapeless_6.2_2.12;1.2.0-M12!argonaut-shapeless_6.2_2.12.jar (460ms)
[info] downloading https://repo1.maven.org/maven2/io/argonaut/argonaut_2.12/6.2.4/argonaut_2.12-6.2.4.jar ...
[info] [SUCCESSFUL ] io.get-coursier#coursier-util_2.12;2.0.0-RC6-20!coursier-util_2.12.jar (474ms)
[info] downloading https://repo1.maven.org/maven2/com/chuusai/shapeless_2.12/2.3.3/shapeless_2.12-2.3.3.jar ...
[info] [SUCCESSFUL ] org.scala-lang.modules#scala-xml_2.12;1.3.0!scala-xml_2.12.jar(bundle) (481ms)
[info] downloading https://repo1.maven.org/maven2/org/scala-lang/scala-reflect/2.12.13/scala-reflect-2.12.13.jar ...
[info] [SUCCESSFUL ] io.github.alexarchambault.windows-ansi#windows-ansi;0.0.3!windows-ansi.jar (454ms)
[info] downloading https://repo1.maven.org/maven2/org/typelevel/macro-compat_2.12/1.1.1/macro-compat_2.12-1.1.1.jar ...
[info] [SUCCESSFUL ] org.fusesource.jansi#jansi;1.18!jansi.jar (483ms)
[info] [SUCCESSFUL ] io.argonaut#argonaut_2.12;6.2.4!argonaut_2.12.jar (479ms)
[info] [SUCCESSFUL ] com.chuusai#shapeless_2.12;2.3.3!shapeless_2.12.jar(bundle) (621ms)
[info] [SUCCESSFUL ] org.scala-lang#scala-reflect;2.12.13!scala-reflect.jar (628ms)
[info] [SUCCESSFUL ] org.typelevel#macro-compat_2.12;1.1.1!macro-compat_2.12.jar (453ms)
[info] [SUCCESSFUL ] io.get-coursier#coursier_2.12;2.0.0-RC6-20!coursier_2.12.jar (60373ms)
[info] resolving Giter8 0.13.1...
A template to demonstrate a minimal Scala 3 application
name [Scala 3 Project Template]: test
Template applied in ~/test/./test
なるほど、別でフォルダを作る必要はなかったようですね。
フォルダを見てみましょう
% cd test
% ls
README.md build.sbt project src
ふむふむ。
% cat README.md
## sbt project compiled with Scala 3
### Usage
This is a normal sbt project. You can compile code with `sbt compile`, run it with `sbt run`, and `sbt console` will start a Scala 3 REPL.
For more information on the sbt-dotty plugin, see the
[scala3-example-project](https://github.com/scala/scala3-example-project/blob/main/README.md).
実行
sbt run で実行できるようです。やってみましょう。
% sbt run
[info] welcome to sbt 1.5.2 (N/A Java 15.0.2)
[info] loading project definition from /Users/kizuki.yasue/aaa/test/project
[info] Updating
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[info] Resolved dependencies
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[info] Fetched artifacts of
[info] loading settings for project root from build.sbt ...
[info] set current project to scala3-simple (in build file:/Users/kizuki.yasue/aaa/test/)
[info] Updating
[info] Resolved dependencies
[info] Updating
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[info] Updating
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[info] Updating
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[info] Resolved dependencies
[info] Fetching artifacts of
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[info] Fetching artifacts of
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[info] Fetched artifacts of
[info] compiling 1 Scala source to ~/test/test/target/scala-3.0.0-RC3/classes ...
[info] running hello
Hello world!
I was compiled by Scala 3. :)
[success] Total time: 8 s, completed 2021/05/16 17:22:47
出力が多いですね... --warn でログレベルを warn 以上にできるようなので、それで再度実行してみましょう。
% sbt --warn run
Hello world!
I was compiled by Scala 3. :)
なるほど。いわゆる Hello world がわかりやすくなりました。
ソースコードも見てみましょう。
% cat src/main/scala/Main.scala
@main def hello: Unit =
println("Hello world!")
println(msg)
def msg = "I was compiled by Scala 3. :)"
おお、噂には聞いていましたがインデント構文ですね。あと @main という見慣れないアノテーションもありますね。後で調べてみますか。
テスト
テストもあるようです。
% cat src/test/scala/Test1.scala
import org.junit.Test
import org.junit.Assert.*
class Test1:
@Test def t1(): Unit =
assertEquals("I was compiled by Scala 3. :)", msg)
junit を使っているようですね。scalatest じゃないんだ、というのが最初の印象。
% sbt test
[info] welcome to sbt 1.5.2 (N/A Java 15.0.2)
[info] loading project definition from /Users/kizuki.yasue/aaa/test/project
[info] loading settings for project root from build.sbt ...
[info] set current project to scala3-simple (in build file:/Users/kizuki.yasue/aaa/test/)
[info] Passed: Total 1, Failed 0, Errors 0, Passed 1
[success] Total time: 1 s, completed 2021/05/16 17:31:09
なるほど。@Test の使い方を見ると、やはり @main はアノテーションのようですね。
まとめ
一通り Scala3 の導入ページにある機能を触ってみました。
- brew にてインストールができること
- command line tools をインストールする必要がある
- 以前に scala 2系を入れている場合は unlink する必要がある
- sbt にて新規プロジェクトを作成できる
- sbt は brew でインストールできる
- サンプルソースはインデント構文ベース
- サンプルテストはjunitベース
以上です。