Revert "guard nonisolated(unsafe) by experimental feature"

This reverts commit 0361e88.

Author: sophiapoirier

CodeGeneration/Sources/SyntaxSupport/ExperimentalFeatures.swift

@@ -18,7 +18,6 @@ public enum ExperimentalFeature: String, CaseIterable {
  case typedThrows
  case doExpressions
  case nonEscapableTypes
- case globalConcurrency
 
  /// The name of the feature, which is used in the doc comment.
  public var featureName: String {
@@ -33,8 +32,6 @@ public enum ExperimentalFeature: String, CaseIterable {
  return "'do' expressions"
  case .nonEscapableTypes:
  return "NonEscableTypes"
- case .globalConcurrency:
- return "strict concurrency for globals"
  }
  }
 

Sources/SwiftParser/Modifiers.swift

@@ -61,12 +61,7 @@ extension Parser {
  case (.declarationModifier(.unowned), let handle)?:
  elements.append(self.parseUnownedModifier(handle))
  case (.declarationModifier(.nonisolated), let handle)?:
- if experimentalFeatures.contains(.globalConcurrency) {
- elements.append(parseNonisolatedModifier(handle))
- } else {
- let (unexpectedBeforeKeyword, keyword) = self.eat(handle)
- elements.append(RawDeclModifierSyntax(unexpectedBeforeKeyword, name: keyword, detail: nil, arena: self.arena))
- }
+ elements.append(parseNonisolatedModifier(handle))
  case (.declarationModifier(.final), let handle)?,
  (.declarationModifier(.required), let handle)?,
  (.declarationModifier(.optional), let handle)?,

Sources/SwiftParser/generated/ExperimentalFeatures.swift

@@ -38,7 +38,4 @@ extension Parser.ExperimentalFeatures {
 
  /// Whether to enable the parsing of NonEscableTypes.
  public static let nonEscapableTypes = Self (rawValue: 1 << 4)
- 
- /// Whether to enable the parsing of strict concurrency for globals.
- public static let globalConcurrency = Self (rawValue: 1 << 5)
 }

Tests/SwiftParserTest/DeclarationTests.swift

@@ -265,8 +265,7 @@ final class DeclarationTests: ParserTestCase {
  nonisolated(unsafe) var c: Int { 0 }
  nonisolated(unsafe) let d = 0
  }
- """,
- experimentalFeatures: [.globalConcurrency]
+ """
  )
  }