chore: initial commit

.envrc

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+use flake ~/nixos/dev-flakes/#scala

.gitignore

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+# macOS
+.DS_Store
+
+# sbt specific
+dist/*
+target/
+lib_managed/
+src_managed/
+project/boot/
+project/plugins/project/
+project/local-plugins.sbt
+.history
+.ensime
+.ensime_cache/
+.sbt-scripted/
+local.sbt
+
+# Bloop
+.bsp
+
+# VS Code
+.vscode/
+
+# Metals
+.bloop/
+.metals/
+metals.sbt
+
+# IDEA
+.idea
+.idea_modules
+/.worksheet/
+
+.direnv

README.md

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+## 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).

build.sbt

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+val scala3Version = "3.6.4"
+
+lazy val root = project
+  .in(file("."))
+  .settings(
+    name := "AOC2024",
+    version := "0.1.0-SNAPSHOT",
+
+    scalaVersion := scala3Version,
+
+    libraryDependencies += "org.scalameta" %% "munit" % "1.0.0" % Test
+  )

project/build.properties

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+sbt.version=1.10.11

src/main/scala/Main.scala

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+@main def hello(): Unit =
+  println("Hello world!")
+  println(msg)
+
+def msg = "I was compiled by Scala 3. :)"

src/test/scala/MySuite.scala

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+// For more information on writing tests, see
+// https://scalameta.org/munit/docs/getting-started.html
+class MySuite extends munit.FunSuite {
+  test("example test that succeeds") {
+    val obtained = 42
+    val expected = 42
+    assertEquals(obtained, expected)
+  }
+}