Add the required OptIn annotations

Author: dkhalanskyjb

core/build.gradle.kts

@@ -399,4 +399,4 @@ tasks.configureEach {
 with(org.jetbrains.kotlin.gradle.targets.js.nodejs.NodeJsRootPlugin.apply(rootProject)) {
     nodeVersion = "21.0.0-v8-canary202309167e82ab1fa2"
     nodeDownloadBaseUrl = "https://nodejs.org/download/v8-canary"
-}
+}

core/linux/src/TimeZoneNative.kt

@@ -3,6 +3,7 @@
  * Use of this source code is governed by the Apache 2.0 License that can be found in the LICENSE.txt file.
  */
 
+@file:OptIn(ExperimentalForeignApi::class)
 package kotlinx.datetime
 
 import kotlinx.cinterop.*
@@ -64,8 +65,8 @@ internal actual fun currentTime(): Instant = memScoped {
         val errorStr: String = strerror(errno)?.toKString() ?: "Unknown error"
         throw IllegalStateException("Could not obtain the current clock readings from the system: $errorStr")
     }
-    val seconds: Long = tm.tv_sec
-    val nanoseconds: Int = tm.tv_nsec.toInt()
+    val seconds: Long = tm.tv_sec.convert<Long>()
+    val nanoseconds: Int = tm.tv_nsec.convert<Int>()
     try {
         require(nanoseconds in 0 until NANOS_PER_ONE)
         return Instant(seconds, nanoseconds)
@@ -74,5 +75,4 @@ internal actual fun currentTime(): Instant = memScoped {
     }
 }
 
-@ThreadLocal
 private val tzdbOnFilesystem = TzdbOnFilesystem(Path.fromString("/usr/share/zoneinfo"))

core/linux/test/TimeZoneRulesCompleteTest.kt

@@ -59,6 +59,7 @@ class TimeZoneRulesCompleteTest {
     }
 }
 
+@OptIn(ExperimentalForeignApi::class)
 private inline fun runUnixCommand(command: String): Sequence<String> = sequence {
     val pipe = popen(command, "r") ?: error("Failed to run command: $command")
     try {

core/nix/src/internal/filesystem.kt

@@ -3,6 +3,7 @@
  * Use of this source code is governed by the Apache 2.0 License that can be found in the LICENSE.txt file.
  */
 
+@file:OptIn(ExperimentalForeignApi::class)
 package kotlinx.datetime.internal
 
 import kotlinx.cinterop.*
@@ -81,7 +82,6 @@ internal fun Path.traverseDirectory(exclude: Set<String> = emptySet(), stripLead
     }
 }
 
-
 internal fun Path.readBytes(): ByteArray {
     val handler = fopen(this.toString(), "rb") ?: throw RuntimeException("Cannot open file $this")
     try {

core/windows/src/TimeZoneNative.kt

@@ -2,7 +2,7 @@
  * Copyright 2019-2023 JetBrains s.r.o. and contributors.
  * Use of this source code is governed by the Apache 2.0 License that can be found in the LICENSE.txt file.
  */
-
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 package kotlinx.datetime
 
 import kotlinx.cinterop.*

core/windows/src/TzdbInRegistry.kt

@@ -2,7 +2,7 @@
  * Copyright 2019-2023 JetBrains s.r.o. and contributors.
  * Use of this source code is governed by the Apache 2.0 License that can be found in the LICENSE.txt file.
  */
-
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
 package kotlinx.datetime
 
 import kotlinx.cinterop.*