Enabled cross build with Scala 3.x for core

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
         with:
           java-version: ${{ matrix.java }}
       - uses: coursier/cache-action@v6
-      - run: "sbt test mimaReportBinaryIssues 'set sbtplugin/scriptedSbt := \"1.2.8\"' 'scripted sbt-mima-plugin/minimal'"
+      - run: "sbt +test mimaReportBinaryIssues 'set sbtplugin/scriptedSbt := \"1.2.8\"' 'scripted sbt-mima-plugin/minimal'"
   testFunctional:
     needs: build
     strategy:

build.sbt

@@ -26,6 +26,7 @@ commands += Command.command("testStaging") { state =>
 }
 
 val scala213 = "2.13.6"
+val scala3 = "3.0.2"
 
 val root = project.in(file(".")).settings(
   name := "mima",
@@ -39,7 +40,7 @@ val munit = "org.scalameta" %% "munit" % "0.7.29"
 
 val core = project.settings(
   name := "mima-core",
-  crossScalaVersions += scala213,
+  crossScalaVersions ++= Seq(scala213, scala3),
   libraryDependencies += munit % Test,
   testFrameworks += new TestFramework("munit.Framework"),
   MimaSettings.mimaSettings,

core/src/main/scala/com/typesafe/tools/mima/core/MimaUnpickler.scala

@@ -279,11 +279,12 @@ object MimaUnpickler {
     var idx = 0
     var res = 0L
     var b   = 0L
-    do {
+    while({
       b    = data(idx).toLong
       idx += 1
       res  = (res << 7) + (b & 0x7f)
-    } while ((b & 0x80) != 0L)
+      (b & 0x80) != 0L
+    }) ()
     res.toInt
   }
 

core/src/main/scala/com/typesafe/tools/mima/core/PickleBuffer.scala

@@ -12,10 +12,11 @@ final class PickleBuffer(val bytes: Array[Byte]) {
   def readLongNat(): Long = {
     var b = 0L
     var x = 0L
-    do {
+    while({
       b = readByte().toLong
       x = (x << 7) + (b & 0x7f)
-    } while ((b & 0x80) != 0L)
+      (b & 0x80) != 0L
+    }) ()
     x
   }
 

core/src/main/scala/com/typesafe/tools/mima/core/Signature.scala

@@ -30,8 +30,8 @@ class Signature(private val signature: String) {
     newer.isEmpty || // ignore losing signature on constructors
     signature.endsWith(newer.tail) // ignore losing the 1st (outer) param (.tail drops the leading '(')
 
-    // a method that takes no parameters and returns Object can have no signature
-    override def toString = if (signature.isEmpty) "<missing>" else signature
+  // a method that takes no parameters and returns Object can have no signature
+  override def toString = if (signature.isEmpty) "<missing>" else signature
 }
 
 object Signature {

core/src/main/scala/com/typesafe/tools/mima/core/TastyUnpickler.scala

@@ -122,7 +122,7 @@ object TastyUnpickler {
           if (nextByte == SELFDEF) skipTree(readByte())                                                        // self
           val classes = new ListBuffer[ClsDef]
           val meths = new ListBuffer[DefDef]
-          doUntil(end)(readByte match {
+          doUntil(end)(readByte() match {
             case TYPEDEF => readTypeDef() match { case clsDef: ClsDef => classes += clsDef case _ => }
             case  DEFDEF => meths += readDefDef()
             case tag     => skipTree(tag)
@@ -354,7 +354,7 @@ object TastyUnpickler {
 
   final case class SimpleName(raw: String)                                                   extends Name
   final case class ObjectName(base: Name)                                                    extends Name
-  final case class TypeName private (base: Name)                                             extends Name
+  final case class TypeName private[TastyUnpickler] (base: Name)                             extends Name
   final case class QualifiedName(qual: Name, sep: SimpleName, sel: SimpleName)               extends Name
 
   final case class UniqueName(qual: Name, sep: SimpleName, num: Int)                         extends Name