From 6e919fa7104863165296d2db3c8a09ac4967e867 Mon Sep 17 00:00:00 2001
From: Orhan Yigit Yazicilar <y_yazicilar@apple.com>
Date: Tue, 23 Sep 2025 14:55:57 +0000
Subject: [PATCH 1/2] Drop Swift 5.10

---
 Package.swift | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/Package.swift b/Package.swift
index 582d905..6fc7fde 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,9 +1,9 @@
-// swift-tools-version:5.10
+// swift-tools-version:6.0
 //===----------------------------------------------------------------------===//
 //
 // This source file is part of the SwiftASN1 open source project
 //
-// Copyright (c) 2019-2023 Apple Inc. and the SwiftASN1 project authors
+// Copyright (c) 2019-2025 Apple Inc. and the SwiftASN1 project authors
 // Licensed under Apache License v2.0
 //
 // See LICENSE.txt for license information
@@ -16,10 +16,19 @@
 import PackageDescription
 import class Foundation.ProcessInfo
 
-let upcomingFeatureSwiftSettings: [SwiftSetting] = [
-    .enableUpcomingFeature("ExistentialAny"),
-    .enableUpcomingFeature("StrictConcurrency"),
-]
+let strictConcurrencyDevelopment = false
+
+let strictConcurrencySettings: [SwiftSetting] = {
+    var initialSettings: [SwiftSetting] = []
+
+    if strictConcurrencyDevelopment {
+        // -warnings-as-errors here is a workaround so that IDE-based development can
+        // get tripped up on -require-explicit-sendable.
+        initialSettings.append(.unsafeFlags(["-require-explicit-sendable", "-warnings-as-errors"]))
+    }
+
+    return initialSettings
+}()
 
 let package = Package(
     name: "swift-asn1",
@@ -30,12 +39,12 @@ let package = Package(
         .target(
             name: "SwiftASN1",
             exclude: ["CMakeLists.txt"],
-            swiftSettings: upcomingFeatureSwiftSettings
+            swiftSettings: strictConcurrencySettings
         ),
         .testTarget(
             name: "SwiftASN1Tests",
             dependencies: ["SwiftASN1"],
-            swiftSettings: upcomingFeatureSwiftSettings
+            swiftSettings: strictConcurrencySettings
         ),
     ]
 )

From 1ff7d7d2694b14500b36533080a5c8c0f27f038a Mon Sep 17 00:00:00 2001
From: Orhan Yigit Yazicilar <y_yazicilar@apple.com>
Date: Tue, 23 Sep 2025 16:25:22 +0100
Subject: [PATCH 2/2] Re-enable ExistentialAny

---
 Package.swift | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Package.swift b/Package.swift
index 6fc7fde..8dec772 100644
--- a/Package.swift
+++ b/Package.swift
@@ -19,7 +19,9 @@ import class Foundation.ProcessInfo
 let strictConcurrencyDevelopment = false
 
 let strictConcurrencySettings: [SwiftSetting] = {
-    var initialSettings: [SwiftSetting] = []
+    var initialSettings: [SwiftSetting] = [
+        .enableUpcomingFeature("ExistentialAny")
+    ]
 
     if strictConcurrencyDevelopment {
         // -warnings-as-errors here is a workaround so that IDE-based development can