Remove library/src-3.x

Author: nicolasstucki

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

@@ -250,7 +250,7 @@ class CompilationTests extends ParallelTesting {
       Array("-Ycheck-reentrant", "-Yemit-tasty-in-class")
     )
 
-    val libraryDirs = List(Paths.get("library/src"), Paths.get("library/src-3.x"), Paths.get("library/src-bootstrapped"))
+    val libraryDirs = List(Paths.get("library/src"), Paths.get("library/src-bootstrapped"))
     val librarySources = libraryDirs.flatMap(sources(_))
 
     val lib =

project/Build.scala

@@ -708,28 +708,15 @@ object Build {
     // Needed so that the library sources are visible when `dotty.tools.dotc.core.Definitions#init` is called
     scalacOptions in Compile ++= Seq("-sourcepath", (scalaSource in Compile).value.getAbsolutePath),
 
-    // To be removed once we stop cross-compiling with Scala 2
-    unmanagedSourceDirectories in Compile += {
-      val baseDir = baseDirectory.value
-      if (!isDotty.value)
-        baseDir / "src-2.x"
-      else
-        baseDir / "src-3.x"
-    },
-
     // Add version-specific source directories:
     // - files in src-non-bootstrapped will only be compiled by the reference compiler
     // - files in src-bootstrapped will only be compiled by the current dotty compiler (non-bootstrapped and bootstrapped)
     unmanagedSourceDirectories in Compile ++= {
       val baseDir = baseDirectory.value
-      if (isDotty.value) {
-        if (scalaVersion.value == referenceVersion)
-          Seq(baseDir / "src-non-bootstrapped")
-        else
-          Seq(baseDir / "src-bootstrapped")
-      }
+      if (scalaVersion.value == referenceVersion)
+        Seq(baseDir / "src-non-bootstrapped")
       else
-        Seq()
+        Seq(baseDir / "src-bootstrapped")
     }
   )