Separate features related to tracked into a separate sub-feature

Author: KacperFKorban

.github/workflows/ci.yaml

@@ -1125,7 +1125,7 @@ jobs:
     needs: [build-msi-package]
     with:
       # Ensure that version starts with prefix 3.
-      # In the future it can be adapted to compare with with git tag or version set in the build.s 
+      # In the future it can be adapted to compare with with git tag or version set in the build.s
       version: "3."
       java-version: 8
 

compiler/src/dotty/tools/dotc/config/Feature.scala

@@ -35,6 +35,7 @@ object Feature:
   val captureChecking = experimental("captureChecking")
   val into = experimental("into")
   val modularity = experimental("modularity")
+  val tracked = experimental("tracked")
   val betterMatchTypeExtractors = experimental("betterMatchTypeExtractors")
   val quotedPatternsWithPolymorphicFunctions = experimental("quotedPatternsWithPolymorphicFunctions")
   val betterFors = experimental("betterFors")
@@ -66,6 +67,7 @@ object Feature:
     (captureChecking, "Enable experimental capture checking"),
     (into, "Allow into modifier on parameter types"),
     (modularity, "Enable experimental modularity features"),
+    (tracked, "Enable tracked modifier"),
     (betterMatchTypeExtractors, "Enable better match type extractors"),
     (betterFors, "Enable improvements in `for` comprehensions")
   )
@@ -111,7 +113,7 @@ object Feature:
    *                    feature is defined.
    */
   def enabled(feature: TermName)(using Context): Boolean =
-    enabledBySetting(feature) || enabledByImport(feature) || feature == modularity
+    enabledBySetting(feature) || enabledByImport(feature)
 
   /** Is auto-tupling enabled? */
   def autoTuplingEnabled(using Context): Boolean = !enabled(nme.noAutoTupling)
@@ -127,6 +129,8 @@ object Feature:
 
   def betterForsEnabled(using Context) = enabled(betterFors)
 
+  def trackedEnabled(using Context) = enabled(tracked) || enabled(modularity)
+
   def genericNumberLiteralsEnabled(using Context) = enabled(genericNumberLiterals)
 
   def scala2ExperimentalMacroEnabled(using Context) = enabled(scala2macros)

compiler/src/dotty/tools/dotc/core/tasty/TreeUnpickler.scala

@@ -924,7 +924,7 @@ class TreeUnpickler(reader: TastyReader,
           val resType =
             if name == nme.CONSTRUCTOR then
               effectiveResultType(sym, paramss)
-            else if sym.isAllOf(Given | Method) && Feature.enabled(Feature.modularity) then
+            else if sym.isAllOf(Given | Method) && Feature.trackedEnabled then
               addParamRefinements(tpt.tpe, paramss)
             else
               tpt.tpe

compiler/src/dotty/tools/dotc/parsing/Parsers.scala

@@ -3525,7 +3525,7 @@ object Parsers {
         if isErasedKw then
           mods = addModifier(mods)
         if paramOwner.isClass then
-          if isIdent(nme.tracked) && in.featureEnabled(Feature.modularity) && !in.lookahead.isColon then
+          if isIdent(nme.tracked) && (in.featureEnabled(Feature.tracked) || in.featureEnabled(Feature.modularity)) && !in.lookahead.isColon then
             mods = addModifier(mods)
           mods = addFlag(modifiers(start = mods), ParamAccessor)
           mods =
@@ -3601,7 +3601,7 @@ object Parsers {
                     || isIdent
                         && (in.name == nme.inline    // inline starts a name binding
                            || in.name == nme.tracked // tracked starts a name binding under x.modularity
-                              && in.featureEnabled(Feature.modularity)
+                              && (in.featureEnabled(Feature.tracked) || in.featureEnabled(Feature.modularity))
                            || in.lookahead.isColon)  // a following `:` starts a name binding
                   (mods, paramsAreNamed)
               val params =

compiler/src/dotty/tools/dotc/transform/PostTyper.scala

@@ -378,7 +378,7 @@ class PostTyper extends MacroTransform with InfoTransformer { thisPhase =>
               def checkClassType(tpe: Type, stablePrefixReq: Boolean) =
                 ctx.typer.checkClassType(tpe, tree.srcPos,
                     traitReq = false, stablePrefixReq = stablePrefixReq,
-                    refinementOK = Feature.enabled(Feature.modularity))
+                    refinementOK = Feature.trackedEnabled)
               checkClassType(tree.tpe, true)
               if !nu.tpe.isLambdaSub then
                 // Check the constructor type as well; it could be an illegal singleton type

compiler/src/dotty/tools/dotc/typer/Checking.scala

@@ -197,7 +197,7 @@ object Checking {
    *  and that the instance conforms to the self type of the created class.
    */
   def checkInstantiable(tp: Type, srcTp: Type, pos: SrcPos)(using Context): Unit =
-    tp.underlyingClassRef(refinementOK = Feature.enabled(modularity)) match
+    tp.underlyingClassRef(refinementOK = Feature.trackedEnabled) match
       case tref: TypeRef =>
         val cls = tref.symbol
         if (cls.isOneOf(AbstractOrTrait)) {

compiler/src/dotty/tools/dotc/typer/Namer.scala

@@ -294,7 +294,7 @@ class Namer { typer: Typer =>
 
         val completer = tree match
           case tree: TypeDef => TypeDefCompleter(tree)(cctx)
-          case tree: ValOrDefDef if Feature.enabled(Feature.modularity) && isNonInferingTree(tree) =>
+          case tree: ValOrDefDef if Feature.trackedEnabled && isNonInferingTree(tree) =>
             NonInferingCompleter(tree)(cctx)
           case _ => Completer(tree)(cctx)
         val info = adjustIfModule(completer, tree)
@@ -1614,7 +1614,7 @@ class Namer { typer: Typer =>
         if (cls.isRefinementClass) ptype
         else {
           val pt = checkClassType(
-              if Feature.enabled(modularity)
+              if Feature.trackedEnabled
               then ptype.separateRefinements(cls, parentRefinements)
               else ptype,
               parent.srcPos,
@@ -1790,8 +1790,7 @@ class Namer { typer: Typer =>
     index(constr.leadingTypeParams)
     sym.owner.typeParams.foreach(_.ensureCompleted())
     completeTrailingParamss(constr, sym, indexingCtor = true)
-    if Feature.enabled(modularity) then
-      // println(i"[indexConstructor] Checking if params of $constr need tracked")
+    if Feature.trackedEnabled then
       constr.termParamss.foreach(_.foreach(setTracked))
 
   /** The signature of a module valdef.
@@ -1941,7 +1940,7 @@ class Namer { typer: Typer =>
           wasSet = true
       wasSet
 
-    if Feature.enabled(modularity) then addTrackedIfNeeded(ddef, sym.maybeOwner)
+    if Feature.trackedEnabled then addTrackedIfNeeded(ddef, sym.maybeOwner)
 
     if isConstructor then
       // set result type tree to unit, but take the current class as result type of the symbol
@@ -1950,7 +1949,7 @@ class Namer { typer: Typer =>
       if sym.isPrimaryConstructor then checkCaseClassParamDependencies(mt, sym.owner)
       mt
     else
-      val paramFn = if Feature.enabled(Feature.modularity) && sym.isAllOf(Given | Method) then wrapRefinedMethType else wrapMethType
+      val paramFn = if Feature.trackedEnabled && sym.isAllOf(Given | Method) then wrapRefinedMethType else wrapMethType
       valOrDefDefSig(ddef, sym, paramSymss, paramFn)
   end defDefSig
 

compiler/src/dotty/tools/dotc/typer/Typer.scala

@@ -1145,7 +1145,7 @@ class Typer(@constructorOnly nestingLevel: Int = 0) extends Namer
         if templ1.parents.isEmpty
             && isFullyDefined(pt, ForceDegree.flipBottom)
             && isSkolemFree(pt)
-            && isEligible(pt.underlyingClassRef(refinementOK = Feature.enabled(modularity)))
+            && isEligible(pt.underlyingClassRef(refinementOK = Feature.trackedEnabled))
         then
           templ1 = cpy.Template(templ)(parents = untpd.TypeTree(pt) :: Nil)
         for case parent: RefTree <- templ1.parents do
@@ -4705,7 +4705,7 @@ class Typer(@constructorOnly nestingLevel: Int = 0) extends Namer
           cpy.Ident(qual)(qual.symbol.name.sourceModuleName.toTypeName)
         case _ =>
           errorTree(tree, em"cannot convert from $tree to an instance creation expression")
-      val tycon = ctorResultType.underlyingClassRef(refinementOK = Feature.enabled(modularity))
+      val tycon = ctorResultType.underlyingClassRef(refinementOK = Feature.trackedEnabled)
       typed(
         untpd.Select(
           untpd.New(untpd.TypedSplice(tpt.withType(tycon))),

library/src/scala/runtime/stdLibPatches/language.scala

@@ -112,6 +112,13 @@ object language:
     @compileTimeOnly("`modularity` can only be used at compile time in import statements")
     object modularity
 
+    /** Experimental support for tracked modifier
+     *
+     * `tracked` is a subset of `modularity`
+     */
+    @compileTimeOnly("`tracked` can only be used at compile time in import statements")
+    object tracked
+
     /** Was needed to add support for relaxed imports of extension methods.
       * The language import is no longer needed as this is now a standard feature since SIP was accepted.
       * @see [[http://dotty.epfl.ch/docs/reference/contextual/extension-methods]]

scaladoc/src/dotty/tools/scaladoc/tasty/TastyParser.scala

@@ -127,7 +127,6 @@ case class ScaladocTastyInspector()(using ctx: DocContext) extends Inspector:
       topLevels ++= intrinsicTypeDefs
       val scalaPckg = defn.ScalaPackage
       given parser.qctx.type = parser.qctx
-      import parser.dri
       topLevels += "scala" -> Member(scalaPckg.fullName, "", scalaPckg.dri, Kind.Package)
       topLevels += mergeAnyRefAliasAndObject(parser)
 

tests/pos/infer-tracked-1.scala

@@ -1,4 +1,4 @@
-import scala.language.experimental.modularity
+import scala.language.experimental.tracked
 import scala.language.future
 
 trait Ordering {

tests/pos/infer-tracked-parent-refinements.scala

@@ -1,4 +1,4 @@
-import scala.language.experimental.modularity
+import scala.language.experimental.tracked
 import scala.language.future
 
 trait WithValue { type Value = Int }

tests/pos/infer-tracked-parsercombinators-expanded.scala

@@ -1,4 +1,4 @@
-import scala.language.experimental.modularity
+import scala.language.experimental.tracked
 import scala.language.future
 
 import collection.mutable

tests/pos/infer-tracked-parsercombinators-givens.scala

@@ -1,4 +1,4 @@
-import scala.language.experimental.modularity
+import scala.language.experimental.tracked
 import scala.language.future
 import collection.mutable
 

tests/pos/infer-tracked-vector.scala

@@ -1,4 +1,4 @@
-import scala.language.experimental.modularity
+import scala.language.experimental.tracked
 import scala.language.future
 
 object typeparams:

tests/pos/infer-tracked.scala

@@ -1,4 +1,4 @@
-import scala.language.experimental.modularity
+import scala.language.experimental.tracked
 import scala.language.future
 
 abstract class C: