Add NonescapableTypes feature

Author: grynspan

Package.swift

@@ -171,6 +171,7 @@ extension Array where Element == PackageDescription.SwiftSetting {
       .unsafeFlags(["-require-explicit-sendable"]),
       .enableUpcomingFeature("ExistentialAny"),
       .enableExperimentalFeature("SuppressedAssociatedTypes"),
+      .enableExperimentalFeature("NonescapableTypes"),
       .enableExperimentalFeature("LifetimeDependence"),
 
       .enableExperimentalFeature("AccessLevelOnImport"),

cmake/modules/shared/CompilerSettings.cmake

@@ -15,6 +15,7 @@ add_compile_options(
 add_compile_options(
   "SHELL:$<$<COMPILE_LANGUAGE:Swift>:-Xfrontend -enable-experimental-feature -Xfrontend AccessLevelOnImport>"
   "SHELL:$<$<COMPILE_LANGUAGE:Swift>:-Xfrontend -enable-experimental-feature -Xfrontend SuppressedAssociatedTypes>"
+  "SHELL:$<$<COMPILE_LANGUAGE:Swift>:-Xfrontend -enable-experimental-feature -Xfrontend NonescapableTypes>"
   "SHELL:$<$<COMPILE_LANGUAGE:Swift>:-Xfrontend -enable-experimental-feature -Xfrontend LifetimeDependence>")
 add_compile_options(
   "SHELL:$<$<COMPILE_LANGUAGE:Swift>:-Xfrontend -enable-upcoming-feature -Xfrontend ExistentialAny>"