Say goodbye to the 2.12 stdlib

It's too hard to maintain it on top of the 2.13 stdlib, too bad because
it's proven to be a great torture test of the compiler.

Author: smarter

compiler/test/dotty/tools/TestSources.scala

@@ -7,14 +7,6 @@ import scala.collection.JavaConverters._
 
 object TestSources {
 
-  // Std Lib
-  def stdLibSources: List[String] = {
-    val blacklisted = List(
-      "volatile.scala",          // see #5610
-    )
-    sources(Paths.get("tests/scala2-library/src/library/"), excludedFiles = blacklisted)
-  }
-
   // pos tests lists
 
   def posFromTastyBlacklistFile: String = "compiler/test/dotc/pos-from-tasty.blacklist"

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

@@ -32,16 +32,9 @@ class CompilationTests extends ParallelTesting {
 
   // Positive tests ------------------------------------------------------------
 
-  // @Test  // enable to test compileStdLib separately with detailed stats
-  def compileStdLibOnly: Unit = {
-    implicit val testGroup: TestGroup = TestGroup("compileStdLibOnly")
-    compileList("compileStdLib", TestSources.stdLibSources, scala2Mode.and("-migration", "-Yno-inline"))
-  }.checkCompile()
-
   @Test def pos: Unit = {
     implicit val testGroup: TestGroup = TestGroup("compilePos")
     aggregateTests(
-      compileList("compileStdLib", TestSources.stdLibSources, scala2Mode.and("-migration", "-Yno-inline")),
       compileFile("tests/pos/nullarify.scala", defaultOptions.and("-Ycheck:nullarify")),
       compileFile("tests/pos-scala2/rewrites.scala", scala2Mode.and("-rewrite")).copyToTarget(),
       compileFile("tests/pos-special/utf8encoded.scala", explicitUTF8),
@@ -51,43 +44,9 @@ class CompilationTests extends ParallelTesting {
       compileFile("tests/pos-special/completeFromSource/Test3.scala", defaultOptions.and("-sourcepath", "tests/pos-special", "-scansource")),
       compileFile("tests/pos-special/completeFromSource/nested/Test4.scala", defaultOptions.and("-sourcepath", "tests/pos-special", "-scansource")),
       compileFilesInDir("tests/pos-special/fatal-warnings", defaultOptions.and("-Xfatal-warnings", "-feature")),
-      compileList(
-        "compileMixed",
-        List(
-          "tests/pos/B.scala",
-          "tests/scala2-library/src/library/scala/collection/immutable/Seq.scala",
-          "tests/scala2-library/src/library/scala/collection/parallel/ParSeq.scala",
-          "tests/scala2-library/src/library/scala/package.scala",
-          "tests/scala2-library/src/library/scala/collection/GenSeqLike.scala",
-          "tests/scala2-library/src/library/scala/collection/SeqLike.scala",
-          "tests/scala2-library/src/library/scala/collection/generic/GenSeqFactory.scala"
-        ),
-        scala2Mode
-      ),
       compileFilesInDir("tests/pos-special/spec-t5545", defaultOptions),
       compileFilesInDir("tests/pos-special/strawman-collections", defaultOptions),
       compileFilesInDir("tests/pos-special/isInstanceOf", allowDeepSubtypes.and("-Xfatal-warnings")),
-      compileFile("tests/scala2-library/src/library/scala/collection/immutable/IndexedSeq.scala", defaultOptions),
-      compileFile("tests/scala2-library/src/library/scala/collection/parallel/mutable/ParSetLike.scala", defaultOptions),
-      compileList(
-        "parSetSubset",
-        List(
-         "tests/scala2-library/src/library/scala/collection/parallel/mutable/ParSetLike.scala",
-         "tests/scala2-library/src/library/scala/collection/parallel/mutable/ParSet.scala",
-         "tests/scala2-library/src/library/scala/collection/mutable/SetLike.scala"
-        ),
-        scala2Mode
-      ),
-      // FIXME: This fails with .times(2), see #2799
-      compileList(
-        "testPredefDeprecatedNonCyclic",
-        List(
-          "tests/scala2-library/src/library/scala/io/Position.scala",
-          "tests/scala2-library/src/library/scala/Predef.scala",
-          "tests/scala2-library/src/library/scala/deprecated.scala"
-        ),
-        scala2Mode
-      ),
       compileFilesInDir("tests/new", defaultOptions),
       compileFilesInDir("tests/pos-scala2", scala2Mode),
       compileFilesInDir("tests/pos", defaultOptions),

compiler/test/dotty/tools/dotc/parsing/ScannerTest.scala

@@ -57,9 +57,4 @@ class ScannerTest extends DottyTest {
   def scanDotty() = {
     scanDir("src")
   }
-
-  @Test
-  def scanScala() = {
-    scanDir("../tests/scala2-library/src")
-  }
 }

compiler/test/dotty/tools/dotc/parsing/desugarPackage.scala

@@ -12,7 +12,6 @@ object desugarPackage extends DeSugarTest {
     val start = System.nanoTime()
     val startNodes = Trees.ntrees
     parseDir("./src")
-    parseDir("./tests/scala2-library/src")
     val ms1 = (System.nanoTime() - start)/1000000
     val nodes = Trees.ntrees
     val buf = parsedTrees map desugarTree

compiler/test/dotty/tools/dotc/parsing/parsePackage.scala

@@ -66,7 +66,6 @@ object parsePackage extends ParserTest {
     nodes = 0
     val start = System.nanoTime()
     parseDir("./src")
-    parseDir("./tests/scala2-library/src")
     val ms1 = (System.nanoTime() - start)/1000000
     val buf = parsedTrees map transformer.transform
     val ms2 = (System.nanoTime() - start)/1000000