Fix fatal bug in is(_:) (#142)

* fix

* add test code

* wip

---------

Co-authored-by: Stephen Celis <stephen@stephencelis.com>

Sources/CasePaths/CasePathable.swift

@@ -410,10 +410,15 @@ extension CasePathable {
  /// userActions.filter { $0.is(\.home) } // [UserAction.home(.onAppear)]
  /// userActions.filter { $0.is(\.settings) } // [UserAction.settings(.subscribeButtonTapped)]
  /// ```
+ @_disfavoredOverload
  public func `is`(_ keyPath: PartialCaseKeyPath<Self>) -> Bool {
  self[case: keyPath] != nil
  }
 
+ public func `is`<Wrapped>(_ keyPath: CaseKeyPath<Self, Wrapped?>) -> Bool {
+ self[case: keyPath] != nil
+ }
+
  /// Unwraps and yields a mutable associated value to a closure.
  ///
  /// > Warning: If the enum's case does not match the given case key path, the mutation will not be

Tests/CasePathsTests/CasePathsTests.swift

@@ -132,14 +132,14 @@ final class CasePathsTests: XCTestCase {
  func testMatch() {
  switch Foo.bar(.int(42)) {
  case \.bar.int:
- return
+ break
  default:
  XCTFail()
  }
 
  switch Foo.bar(.int(42)) {
  case \.bar:
- return
+ break
  default:
  XCTFail()
  }
@@ -150,6 +150,10 @@ final class CasePathsTests: XCTestCase {
  XCTAssertFalse(Foo.bar(.int(42)).is(\.baz.string))
  XCTAssertFalse(Foo.bar(.int(42)).is(\.blob))
  XCTAssertFalse(Foo.bar(.int(42)).is(\.fizzBuzz))
+ XCTAssertTrue(Foo.foo(nil).is(\.foo))
+ XCTAssertTrue(Foo.foo(nil).is(\.foo.none))
+ XCTAssertTrue(Foo.foo("").is(\.foo))
+ XCTAssertFalse(Foo.foo(nil).is(\.bar))
  }
 
  func testPartialCaseKeyPath() {
@@ -169,6 +173,7 @@ final class CasePathsTests: XCTestCase {
  case baz(Baz)
  case fizzBuzz
  case blob(Blob)
+ case foo(String?)
  }
  @CasePathable @dynamicMemberLookup enum Bar: Equatable {
  case int(Int)