fix: Reformat Visitor types to support old Swift versions

Tests/GraphQLTests/LanguageTests/VisitorTests.swift

@@ -8,24 +8,7 @@ class VisitorTests: XCTestCase {
  }
 
  func testValidatesPathArgument() throws {
- struct VisitedElement: Equatable {
- let direction: VisitDirection
- let path: [any IndexPathElement]
-
- init(_ direction: VisitDirection, _ path: [any IndexPathElement]) {
- self.direction = direction
- self.path = path
- }
-
- static func == (lhs: VisitedElement, rhs: VisitedElement) -> Bool {
- return lhs.direction == rhs.direction &&
- zip(lhs.path, rhs.path).allSatisfy { lhs, rhs in
- lhs.description == rhs.description
- }
- }
- }
-
- var visited = [VisitedElement]()
+ var visited = [VisitedPath]()
  let ast = try parse(source: "{ a }", noLocation: true)
 
  visit(root: ast, visitor: .init(
@@ -513,36 +496,7 @@ class VisitorTests: XCTestCase {
  }
 
  func testProperlyVisitsTheKitchenSinkQuery() throws {
- struct VisitedElement: Equatable, CustomDebugStringConvertible {
- var debugDescription: String {
- "(\(direction), \(kind), \(key.debugDescription), \(parentKind.debugDescription))"
- }
-
- let direction: VisitDirection
- let kind: Kind
- let key: (any IndexPathElement)?
- let parentKind: Kind?
-
- init(
- _ direction: VisitDirection,
- _ kind: Kind,
- _ key: (any IndexPathElement)?,
- _ parentKind: Kind?
- ) {
- self.direction = direction
- self.kind = kind
- self.key = key
- self.parentKind = parentKind
- }
-
- static func == (lhs: VisitedElement, rhs: VisitedElement) -> Bool {
- return lhs.direction == rhs.direction &&
- lhs.kind == rhs.kind &&
- lhs.key?.description == rhs.key?.description &&
- lhs.parentKind == rhs.parentKind
- }
- }
- var visited = [VisitedElement]()
+ var visited = [VisitedKindAndParent]()
 
  guard
  let url = Bundle.module.url(forResource: "kitchen-sink", withExtension: "graphql"),
@@ -884,6 +838,59 @@ enum VisitDirection: Equatable {
  case leave
 }
 
+struct VisitedPath {
+ let direction: VisitDirection
+ let path: [any IndexPathElement]
+
+ init(_ direction: VisitDirection, _ path: [any IndexPathElement]) {
+ self.direction = direction
+ self.path = path
+ }
+}
+
+extension VisitedPath: Equatable {
+ static func == (lhs: VisitedPath, rhs: VisitedPath) -> Bool {
+ return lhs.direction == rhs.direction &&
+ zip(lhs.path, rhs.path).allSatisfy { lhs, rhs in
+ lhs.description == rhs.description
+ }
+ }
+}
+
+struct VisitedKindAndParent {
+ let direction: VisitDirection
+ let kind: Kind
+ let key: (any IndexPathElement)?
+ let parentKind: Kind?
+
+ init(
+ _ direction: VisitDirection,
+ _ kind: Kind,
+ _ key: (any IndexPathElement)?,
+ _ parentKind: Kind?
+ ) {
+ self.direction = direction
+ self.kind = kind
+ self.key = key
+ self.parentKind = parentKind
+ }
+}
+
+extension VisitedKindAndParent: Equatable {
+ static func == (lhs: VisitedKindAndParent, rhs: VisitedKindAndParent) -> Bool {
+ return lhs.direction == rhs.direction &&
+ lhs.kind == rhs.kind &&
+ lhs.key?.description == rhs.key?.description &&
+ lhs.parentKind == rhs.parentKind
+ }
+}
+
+extension VisitedKindAndParent: CustomDebugStringConvertible {
+ var debugDescription: String {
+ "(\(direction), \(kind), \(key.debugDescription), \(parentKind.debugDescription))"
+ }
+}
+
 func checkVisitorFnArgs(
  _ ast: Document,
  _ node: Node,