Merge pull request swiftlang#3015 from DougGregor/nonisolated-conformance

Allow parsing of "nonisolated" as a type specifier along with "isolated"

Author: DougGregor

CodeGeneration/Sources/SyntaxSupport/TypeNodes.swift

@@ -648,6 +648,7 @@ public let TYPE_NODES: [Node] = [
           .keyword(.__shared),
           .keyword(.__owned),
           .keyword(.isolated),
+          .keyword(.nonisolated),
           .keyword(._const),
           .keyword(.borrowing),
           .keyword(.consuming),

Sources/SwiftParser/generated/Parser+TokenSpecSet.swift

@@ -765,6 +765,21 @@ final class DeclarationTests: ParserTestCase {
     )
   }
 
+  func testParseIsolatedConformances() {
+    assertParse(
+      """
+      extension Int: nonisolated Q {}
+      """
+    )
+
+    assertParse(
+      """
+      extension Int: @MainActor P {}
+      """
+    )
+
+  }
+
   func testParseDynamicReplacement() {
     assertParse(
       """