Adapt codebase for Swift 5.6 release version (#876)

* Fix SwiftSyntax dep in Package descriptor * Fix SwiftSyntax import * Fix tests by making Actorable class final * Workaround SwiftSyntax parser dependency * Update Package.swift Co-authored-by: Konrad `ktoso` Malawski <konrad.malawski@project13.pl>

Author: segabor

Package.swift

@@ -18,6 +18,12 @@ var globalConcurrencyFlags: [String] = []
 // ])
 // #endif
 
+#if swift(>=5.6)
+let swiftSyntaxDependencyName = "SwiftSyntaxParser"
+#else
+let swiftSyntaxDependencyName = "SwiftSyntax"
+#endif
+
 if ProcessInfo.processInfo.environment["SACT_WARNINGS_AS_ERRORS"] != nil {
  print("SACT_WARNINGS_AS_ERRORS enabled, passing `-warnings-as-errors`")
  var allUnsafeFlags = globalConcurrencyFlags
@@ -68,7 +74,7 @@ var targets: [PackageDescription.Target] = [
  name: "GenActorsLib",
  dependencies: [
  "DistributedActors",
- .product(name: "SwiftSyntax", package: "SwiftSyntax"),
+ .product(name: swiftSyntaxDependencyName, package: "SwiftSyntax"),
  .product(name: "Logging", package: "swift-log"),
  .product(name: "ArgumentParser", package: "swift-argument-parser"),
 
@@ -307,7 +313,7 @@ dependencies.append(
 )
 #elseif swift(>=5.6)
 dependencies.append(
- .package(name: "SwiftSyntax", url: "https://github.com/apple/swift-syntax.git", .exact("0.50600.0"))
+ .package(name: "SwiftSyntax", url: "https://github.com/apple/swift-syntax.git", .exact("0.50600.1"))
 )
 #elseif swift(>=5.5)
 dependencies.append(

Sources/GenActorsLib/GenerateActors.swift

@@ -17,7 +17,11 @@ import DistributedActors
 import Files
 import Foundation
 import Logging
+#if swift(>=5.6)
+import SwiftSyntaxParser
+#else
 import SwiftSyntax
+#endif
 
 final class GenerateActors {
  var log: Logger

Tests/GenActorsTests/ClassStructEtcActorable/ClassStructEtc+Actorable.swift

@@ -14,7 +14,7 @@
 
 import DistributedActors
 
-class ClassActorable: Actorable {
+final class ClassActorable: Actorable {
  // @actor
  func hello() -> String {
  "Hello."