Write "pre-release" flag to class files, do not allow usages in release

core/descriptor.loader.java/src/org/jetbrains/kotlin/load/kotlin/DeserializedDescriptorResolver.kt

@@ -16,6 +16,7 @@
 
 package org.jetbrains.kotlin.load.kotlin
 
+import org.jetbrains.kotlin.config.KotlinCompilerVersion
 import org.jetbrains.kotlin.descriptors.ClassDescriptor
 import org.jetbrains.kotlin.descriptors.PackageFragmentDescriptor
 import org.jetbrains.kotlin.load.kotlin.header.KotlinClassHeader
@@ -49,7 +50,7 @@ class DeserializedDescriptorResolver(private val errorReporter: ErrorReporter) {
         val classData = parseProto(kotlinClass) {
             JvmProtoBufUtil.readClassDataFrom(data, strings)
         }
-        val sourceElement = KotlinJvmBinarySourceElement(kotlinClass)
+        val sourceElement = KotlinJvmBinarySourceElement(kotlinClass, !IS_PRE_RELEASE && kotlinClass.classHeader.isPreRelease)
         return ClassDataWithSource(classData, sourceElement)
     }
 
@@ -92,5 +93,8 @@ class DeserializedDescriptorResolver(private val errorReporter: ErrorReporter) {
 
         private val KOTLIN_FILE_FACADE_OR_MULTIFILE_CLASS_PART =
                 setOf(KotlinClassHeader.Kind.FILE_FACADE, KotlinClassHeader.Kind.MULTIFILE_CLASS_PART)
+
+        var IS_PRE_RELEASE = KotlinCompilerVersion.IS_PRE_RELEASE
+            @Deprecated("Should only be used in tests") set
     }
 }

core/descriptor.loader.java/src/org/jetbrains/kotlin/load/kotlin/JvmPackagePartSource.kt

@@ -30,6 +30,9 @@ class JvmPackagePartSource(val className: JvmClassName, val facadeClassName: Jvm
             }
     )
 
+    // TODO
+    override val isPreReleaseInvisible: Boolean get() = false
+
     val simpleName: Name get() = Name.identifier(className.internalName.substringAfterLast('/'))
 
     val classId: ClassId get() = ClassId(className.packageFqName, simpleName)

core/descriptor.loader.java/src/org/jetbrains/kotlin/load/kotlin/KotlinJvmBinarySourceElement.kt

@@ -18,8 +18,13 @@ package org.jetbrains.kotlin.load.kotlin
 
 import org.jetbrains.kotlin.descriptors.SourceElement
 import org.jetbrains.kotlin.descriptors.SourceFile
+import org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedContainerSource
 
-class KotlinJvmBinarySourceElement(val binaryClass: KotlinJvmBinaryClass) : SourceElement {
-    override fun toString() = "${javaClass.simpleName}: $binaryClass"
+class KotlinJvmBinarySourceElement(
+        val binaryClass: KotlinJvmBinaryClass,
+        override val isPreReleaseInvisible: Boolean = false
+) : DeserializedContainerSource {
     override fun getContainingFile(): SourceFile = SourceFile.NO_SOURCE_FILE
+
+    override fun toString() = "${javaClass.simpleName}: $binaryClass"
 }