Prevent crash on Catalina from missing symbol (#2385)

Author: jaredh159

Sources/ComposableArchitecture/SwiftUI/FullScreenCover.swift

@@ -1,66 +1,68 @@
 import SwiftUI
 
-extension View {
-  /// Presents a modal view that covers as much of the screen as possible using the store you
-  /// provide as a data source for the sheet's content.
-  ///
-  /// > This is a Composable Architecture-friendly version of SwiftUI's `fullScreenCover` view
-  /// > modifier.
-  ///
-  /// - Parameters:
-  ///   - store: A store that is focused on ``PresentationState`` and ``PresentationAction`` for
-  ///     a modal. When `store`'s state is non-`nil`, the system passes a store of unwrapped `State`
-  ///     and `Action` to the modifier's closure. You use this store to power the content in a sheet
-  ///     you create that the system displays to the user. If `store`'s state is `nil`-ed out, the
-  ///     system dismisses the currently displayed sheet.
-  ///   - onDismiss: The closure to execute when dismissing the modal view.
-  ///   - content: A closure returning the content of the modal view.
-  @available(iOS 14, tvOS 14, watchOS 7, *)
-  @available(macOS, unavailable)
-  public func fullScreenCover<State, Action, Content: View>(
-    store: Store<PresentationState<State>, PresentationAction<Action>>,
-    onDismiss: (() -> Void)? = nil,
-    @ViewBuilder content: @escaping (_ store: Store<State, Action>) -> Content
-  ) -> some View {
-    self.presentation(store: store) { `self`, $item, destination in
-      self.fullScreenCover(item: $item, onDismiss: onDismiss) { _ in
-        destination(content)
+#if !os(macOS)
+  extension View {
+    /// Presents a modal view that covers as much of the screen as possible using the store you
+    /// provide as a data source for the sheet's content.
+    ///
+    /// > This is a Composable Architecture-friendly version of SwiftUI's `fullScreenCover` view
+    /// > modifier.
+    ///
+    /// - Parameters:
+    ///   - store: A store that is focused on ``PresentationState`` and ``PresentationAction`` for
+    ///     a modal. When `store`'s state is non-`nil`, the system passes a store of unwrapped `State`
+    ///     and `Action` to the modifier's closure. You use this store to power the content in a sheet
+    ///     you create that the system displays to the user. If `store`'s state is `nil`-ed out, the
+    ///     system dismisses the currently displayed sheet.
+    ///   - onDismiss: The closure to execute when dismissing the modal view.
+    ///   - content: A closure returning the content of the modal view.
+    @available(iOS 14, tvOS 14, watchOS 7, *)
+    @available(macOS, unavailable)
+    public func fullScreenCover<State, Action, Content: View>(
+      store: Store<PresentationState<State>, PresentationAction<Action>>,
+      onDismiss: (() -> Void)? = nil,
+      @ViewBuilder content: @escaping (_ store: Store<State, Action>) -> Content
+    ) -> some View {
+      self.presentation(store: store) { `self`, $item, destination in
+        self.fullScreenCover(item: $item, onDismiss: onDismiss) { _ in
+          destination(content)
+        }
       }
     }
-  }
-
-  /// Presents a modal view that covers as much of the screen as possible using the store you
-  /// provide as a data source for the sheet's content.
-  ///
-  /// > This is a Composable Architecture-friendly version of SwiftUI's `fullScreenCover` view
-  /// > modifier.
-  ///
-  /// - Parameters:
-  ///   - store: A store that is focused on ``PresentationState`` and ``PresentationAction`` for
-  ///     a modal. When `store`'s state is non-`nil`, the system passes a store of unwrapped `State`
-  ///     and `Action` to the modifier's closure. You use this store to power the content in a sheet
-  ///     you create that the system displays to the user. If `store`'s state is `nil`-ed out, the
-  ///     system dismisses the currently displayed sheet.
-  ///   - toDestinationState: A transformation to extract modal state from the presentation state.
-  ///   - fromDestinationAction: A transformation to embed modal actions into the presentation
-  ///     action.
-  ///   - onDismiss: The closure to execute when dismissing the modal view.
-  ///   - content: A closure returning the content of the modal view.
-  @available(iOS 14, tvOS 14, watchOS 7, *)
-  @available(macOS, unavailable)
-  public func fullScreenCover<State, Action, DestinationState, DestinationAction, Content: View>(
-    store: Store<PresentationState<State>, PresentationAction<Action>>,
-    state toDestinationState: @escaping (_ state: State) -> DestinationState?,
-    action fromDestinationAction: @escaping (_ destinationAction: DestinationAction) -> Action,
-    onDismiss: (() -> Void)? = nil,
-    @ViewBuilder content: @escaping (_ store: Store<DestinationState, DestinationAction>) -> Content
-  ) -> some View {
-    self.presentation(
-      store: store, state: toDestinationState, action: fromDestinationAction
-    ) { `self`, $item, destination in
-      self.fullScreenCover(item: $item, onDismiss: onDismiss) { _ in
-        destination(content)
+  
+    /// Presents a modal view that covers as much of the screen as possible using the store you
+    /// provide as a data source for the sheet's content.
+    ///
+    /// > This is a Composable Architecture-friendly version of SwiftUI's `fullScreenCover` view
+    /// > modifier.
+    ///
+    /// - Parameters:
+    ///   - store: A store that is focused on ``PresentationState`` and ``PresentationAction`` for
+    ///     a modal. When `store`'s state is non-`nil`, the system passes a store of unwrapped `State`
+    ///     and `Action` to the modifier's closure. You use this store to power the content in a sheet
+    ///     you create that the system displays to the user. If `store`'s state is `nil`-ed out, the
+    ///     system dismisses the currently displayed sheet.
+    ///   - toDestinationState: A transformation to extract modal state from the presentation state.
+    ///   - fromDestinationAction: A transformation to embed modal actions into the presentation
+    ///     action.
+    ///   - onDismiss: The closure to execute when dismissing the modal view.
+    ///   - content: A closure returning the content of the modal view.
+    @available(iOS 14, tvOS 14, watchOS 7, *)
+    @available(macOS, unavailable)
+    public func fullScreenCover<State, Action, DestinationState, DestinationAction, Content: View>(
+      store: Store<PresentationState<State>, PresentationAction<Action>>,
+      state toDestinationState: @escaping (_ state: State) -> DestinationState?,
+      action fromDestinationAction: @escaping (_ destinationAction: DestinationAction) -> Action,
+      onDismiss: (() -> Void)? = nil,
+      @ViewBuilder content: @escaping (_ store: Store<DestinationState, DestinationAction>) -> Content
+    ) -> some View {
+      self.presentation(
+        store: store, state: toDestinationState, action: fromDestinationAction
+      ) { `self`, $item, destination in
+        self.fullScreenCover(item: $item, onDismiss: onDismiss) { _ in
+          destination(content)
+        }
       }
     }
   }
-}
+#endif