[Inference] Add ability to approximate local types in AbstractTypeApproximator

core/compiler.common/src/org/jetbrains/kotlin/types/model/TypeSystemContext.kt

@@ -304,6 +304,7 @@ interface TypeSystemContext : TypeSystemOptimizationContext {
     fun TypeConstructorMarker.isIntersection(): Boolean
     fun TypeConstructorMarker.isClassTypeConstructor(): Boolean
     fun TypeConstructorMarker.isIntegerLiteralTypeConstructor(): Boolean
+    fun TypeConstructorMarker.isLocalType(): Boolean
 
     fun TypeParameterMarker.getVariance(): TypeVariance
     fun TypeParameterMarker.upperBoundCount(): Int

core/descriptors/src/org/jetbrains/kotlin/types/checker/ClassicTypeSystemContext.kt

@@ -17,10 +17,7 @@ import org.jetbrains.kotlin.name.FqNameUnsafe
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.resolve.calls.inference.CapturedType
 import org.jetbrains.kotlin.resolve.constants.IntegerLiteralTypeConstructor
-import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameUnsafe
-import org.jetbrains.kotlin.resolve.descriptorUtil.hasExactAnnotation
-import org.jetbrains.kotlin.resolve.descriptorUtil.hasNoInferAnnotation
-import org.jetbrains.kotlin.resolve.descriptorUtil.isExactAnnotation
+import org.jetbrains.kotlin.resolve.descriptorUtil.*
 import org.jetbrains.kotlin.resolve.isInlineClass
 import org.jetbrains.kotlin.resolve.substitutedUnderlyingType
 import org.jetbrains.kotlin.types.*
@@ -42,6 +39,11 @@ interface ClassicTypeSystemContext : TypeSystemInferenceExtensionContext, TypeSy
         return this is IntegerLiteralTypeConstructor
     }
 
+    override fun TypeConstructorMarker.isLocalType(): Boolean {
+        require(this is TypeConstructor, this::errorMessage)
+        return declarationDescriptor?.classId?.isLocal == true
+    }
+
     override fun SimpleTypeMarker.possibleIntegerTypes(): Collection<KotlinTypeMarker> {
         val typeConstructor = typeConstructor()
         require(typeConstructor is IntegerLiteralTypeConstructor, this::errorMessage)