chore: drop the old scala2-library-tasty projects

.github/workflows/ci.yaml

@@ -157,59 +157,6 @@ jobs:
         run: |
           ./project/scripts/sbt ";sjsSandbox/run ;sjsSandbox/test ;sjsJUnitTests/test ;set sjsJUnitTests/scalaJSLinkerConfig ~= switchToESModules ;sjsJUnitTests/test ;sjsCompilerTests/test"
 
-      - name: Test with Scala 2 library TASTy (fast)
-        run: ./project/scripts/sbt ";set ThisBuild/Build.scala2Library := Build.Scala2LibraryTasty ;scala3-bootstrapped/testCompilation i5; scala3-bootstrapped/testCompilation tests/run/typelevel-peano.scala; scala3-bootstrapped/testOnly dotty.tools.backend.jvm.DottyBytecodeTests" # only test a subset of test to avoid doubling the CI execution time
-
-      - name: Test with Scala 2 library with CC TASTy (fast)
-        run: ./project/scripts/sbt ";set ThisBuild/Build.scala2Library := Build.Scala2LibraryCCTasty; scala2-library-cc/compile; scala2-library-cc-tasty/compile; scala3-bootstrapped/testCompilation i3"
-
-  test_scala2_library_tasty:
-    runs-on: [self-hosted, Linux]
-    container:
-      image: lampepfl/dotty:2024-10-18
-      options: --cpu-shares 4096
-      volumes:
-        - ${{ github.workspace }}/../../cache/sbt:/root/.sbt
-        - ${{ github.workspace }}/../../cache/ivy:/root/.ivy2/cache
-        - ${{ github.workspace }}/../../cache/general:/root/.cache
-    if: "github.event_name == 'schedule' && github.repository == 'scala/scala3'
-         || (
-           github.event_name == 'pull_request'
-           && contains(github.event.pull_request.body, '[test_scala2_library_tasty]')
-         )
-         || (
-           github.event_name == 'workflow_dispatch'
-           && github.repository == 'scala/scala3'
-         )"
-
-    steps:
-      - name: Set JDK 17 as default
-        run: echo "/usr/lib/jvm/java-17-openjdk-amd64/bin" >> $GITHUB_PATH
-
-      - name: Reset existing repo
-        run: |
-          git config --global --add safe.directory $GITHUB_WORKSPACE
-          git -c "http.https://github.com/.extraheader=" fetch --recurse-submodules=no "https://github.com/scala/scala3" && git reset --hard FETCH_HEAD || true
-
-      - name: Checkout cleanup script
-        uses: actions/checkout@v5
-
-      - name: Cleanup
-        run: .github/workflows/cleanup.sh
-
-      - name: Git Checkout
-        uses: actions/checkout@v5
-
-      - name: Add SBT proxy repositories
-        run: cp -vf .github/workflows/repositories /root/.sbt/ ; true
-
-      - name: Test with Scala 2 library TASTy
-        run: ./project/scripts/sbt ";set ThisBuild/Build.scala2Library := Build.Scala2LibraryTasty ;scala3-bootstrapped/test"
-
-      - name: Test with Scala 2 library with CC TASTy
-        run: ./project/scripts/sbt ";set ThisBuild/Build.scala2Library := Build.Scala2LibraryCCTasty ;scala3-bootstrapped/test"
-
-
   test_windows_fast:
     runs-on: [self-hosted, Windows]
     if: "(
@@ -334,12 +281,7 @@ jobs:
 
       - name: MiMa
         run: |
-          ./project/scripts/sbt ";scala3-interfaces/mimaReportBinaryIssues ;scala3-library-bootstrapped/mimaReportBinaryIssues ;scala3-library-bootstrappedJS/mimaReportBinaryIssues; tasty-core-bootstrapped/mimaReportBinaryIssues; scala2-library-bootstrapped/mimaReportBinaryIssues"
-
-      - name: TASTy MiMa
-        run: |
-          # This script cleans the compiler and recompiles it from scratch (keep as last run)
-          ./project/scripts/scala2-library-tasty-mima.sh
+          ./project/scripts/sbt ";scala3-interfaces/mimaReportBinaryIssues ;scala3-library-bootstrapped/mimaReportBinaryIssues ;scala3-library-bootstrappedJS/mimaReportBinaryIssues; tasty-core-bootstrapped/mimaReportBinaryIssues;"
 
   community_build_a:
     runs-on: [self-hosted, Linux]

build.sbt

@@ -28,10 +28,6 @@ val `scala3-language-server` = Build.`scala3-language-server`
 val `scala3-bench` = Build.`scala3-bench`
 val `scala3-bench-bootstrapped` = Build.`scala3-bench-bootstrapped`
 val `scala3-bench-micro` = Build.`scala3-bench-micro`
-val `scala2-library-bootstrapped` = Build.`scala2-library-bootstrapped`
-val `scala2-library-tasty` = Build.`scala2-library-tasty`
-val `scala2-library-cc` = Build.`scala2-library-cc`
-val `scala2-library-cc-tasty` = Build.`scala2-library-cc-tasty`
 val `tasty-core` = Build.`tasty-core`
 val `tasty-core-nonbootstrapped` = Build.`tasty-core-nonbootstrapped`
 val `tasty-core-bootstrapped-new` = Build.`tasty-core-bootstrapped-new`

compiler/test/dotty/Properties.scala

@@ -81,14 +81,11 @@ object Properties {
   /** scala-library jar */
   def scalaLibrary: String = sys.props("dotty.tests.classes.scalaLibrary")
 
-  /** scala-library TASTy jar */
-  def scalaLibraryTasty: Option[String] = sys.props.get("dotty.tests.tasties.scalaLibrary")
+  // TODO: Remove this once we migrate the test suite
+  def usingScalaLibraryCCTasty: Boolean = false
 
-  /** If we are using the scala-library TASTy jar */
-  def usingScalaLibraryTasty: Boolean = scalaLibraryTasty.isDefined
-  /** If we are using the scala-library TASTy jar */
-
-  def usingScalaLibraryCCTasty: Boolean = scalaLibraryTasty.exists(_.contains("scala2-library-cc-tasty"))
+  // TODO: Remove this once we migrate the test suite
+  def usingScalaLibraryTasty: Boolean = false
 
   /** scala-asm jar */
   def scalaAsm: String = sys.props("dotty.tests.classes.scalaAsm")

compiler/test/dotty/tools/dotc/BootstrappedOnlyCompilationTests.scala

@@ -7,6 +7,7 @@ import scala.language.unsafeNulls
 import org.junit.{ Test, BeforeClass, AfterClass }
 import org.junit.Assert._
 import org.junit.Assume._
+import org.junit.Ignore
 import org.junit.experimental.categories.Category
 
 import scala.concurrent.duration._
@@ -131,7 +132,7 @@ class BootstrappedOnlyCompilationTests {
     aggregateTests(tests*).checkRuns()
   }
 
-  @Test def runScala2LibraryFromTasty: Unit = {
+  @Ignore @Test def runScala2LibraryFromTasty: Unit = {
     implicit val testGroup: TestGroup = TestGroup("runScala2LibraryFromTasty")
     // These tests recompile the entire scala2-library from TASTy,
     // they are resource intensive and should not run alongside other tests to avoid timeouts

compiler/test/dotty/tools/vulpix/TestConfiguration.scala

@@ -25,14 +25,12 @@ object TestConfiguration {
     "-Xverify-signatures"
   )
 
-  val basicClasspath = mkClasspath(
-    Properties.scalaLibraryTasty.toList ::: List(
+  val basicClasspath = mkClasspath(List(
     Properties.scalaLibrary,
     Properties.dottyLibrary
   ))
 
-  val withCompilerClasspath = mkClasspath(
-    Properties.scalaLibraryTasty.toList ::: List(
+  val withCompilerClasspath = mkClasspath(List(
     Properties.scalaLibrary,
     Properties.scalaAsm,
     Properties.jlineTerminal,

docs/_docs/contributing/testing.md

@@ -162,41 +162,6 @@ To run `testCompilation` on a bootstrapped Dotty compiler, use
 Some tests can only be run in bootstrapped compilers; that includes all tests
 with `with-compiler` in their name.
 
-### Scala 2 library TASTy tests
-
-Usually we use the Scala 2 library JAR (with classfiles) generated by Scala 2. We can
-also use a special version of the library that we generate with only TASTy files. This
-JAR is added to the classpath before the Scala 2 library JAR. This allows the compiler
-to load the TASTy and the runtime to load the original classfiles.
-
-The library is compiled in `scala2-library-bootstrapped` with TASTy and classfiles.
-These classfiles should not be used. The `scala2-library-tasty` project repackages the
-JAR `scala2-library-bootstrapped` to only keep TASTy files.
-
-We can enable this library in the build using the SBT setting `useScala2LibraryTasty`. This setting can only be used by bootstrapped compiler tests and is currently only supported for `test` (or `testCompilation`) and `scalac` (or `run`).
-
-```
-$ sbt
-> set ThisBuild/Build.scala2Library := Build.Scala2LibraryTasty
-> scala3-compiler-bootstrapped/scalac MyFile.scala
-> scala3-compiler-bootstrapped/test
-> scala3-compiler-bootstrapped/testCompilation
-```
-
-By default `scala2Library` is set to `Scala2LibraryJar`. This setting can be set to stop using the Scala 2 library TASTy.
-```
-> set ThisBuild/Build.scala2Library := Build.Scala2LibraryJar
-```
-
-#### Scala 2 library with CC TASTy tests
-These follow the same structure as the _Scala 2 library TASTy tests_ but add captured checked signatures to the library. The library is compiled in `scala2-library-cc` (instead of `scala2-library-bootstrapped`) and `scala2-library-cc-tasty` (instead of `scala2-library-cc-tasty`).
-
-We can also enable this library in the build using the SBT setting `useScala2LibraryTasty`.
-```
-> set ThisBuild/Build.scala2Library := Build.Scala2LibraryCCTasty
-```
-
-
 ### From TASTy tests
 
 `testCompilation` has an additional mode to run tests that compile code from a `.tasty` file.