[stdlib] Use hasFeature(Foo) instead of opaque $Foo syntax

lorentey · lorentey · commit 2a1f15587ec6 · 2024-03-18T11:03:49.000-07:00
diff --git a/stdlib/public/core/Optional.swift b/stdlib/public/core/Optional.swift
@@ -212,7 +212,7 @@ extension Optional where Wrapped: ~Copyable {
     }
   }
 
-#if $BorrowingSwitch
+#if hasFeature(BorrowingSwitch)
   @_alwaysEmitIntoClient
   public borrowing func borrowingMap<U: ~Copyable, E: Error>(
     _ transform: (borrowing Wrapped) throws(E) -> U
@@ -274,7 +274,7 @@ extension Optional where Wrapped: ~Copyable {
     }
   }
 
-#if $BorrowingSwitch
+#if hasFeature(BorrowingSwitch)
   @_alwaysEmitIntoClient
   public func borrowingFlatMap<U: ~Copyable, E: Error>(
     _ transform: (borrowing Wrapped) throws(E) -> U?
@@ -542,7 +542,7 @@ public struct _OptionalNilComparisonType: ExpressibleByNilLiteral {
   }
 }
 
-#if $BorrowingSwitch
+#if hasFeature(BorrowingSwitch)
 extension Optional where Wrapped: ~Copyable {
   /// Returns a Boolean value indicating whether an argument matches `nil`.
   ///

Original file line number	Diff line number	Diff line change
`@@ -212,7 +212,7 @@ extension Optional where Wrapped: ~Copyable {`
`212`	`212`	`}`
`213`	`213`	`}`
`214`	`214`
`215`		`-#if $BorrowingSwitch`
	`215`	`+#if hasFeature(BorrowingSwitch)`
`216`	`216`	`@_alwaysEmitIntoClient`
`217`	`217`	`public borrowing func borrowingMap<U: ~Copyable, E: Error>(`
`218`	`218`	`_ transform: (borrowing Wrapped) throws(E) -> U`
`@@ -274,7 +274,7 @@ extension Optional where Wrapped: ~Copyable {`
`274`	`274`	`}`
`275`	`275`	`}`
`276`	`276`
`277`		`-#if $BorrowingSwitch`
	`277`	`+#if hasFeature(BorrowingSwitch)`
`278`	`278`	`@_alwaysEmitIntoClient`
`279`	`279`	`public func borrowingFlatMap<U: ~Copyable, E: Error>(`
`280`	`280`	`_ transform: (borrowing Wrapped) throws(E) -> U?`
`@@ -542,7 +542,7 @@ public struct _OptionalNilComparisonType: ExpressibleByNilLiteral {`
`542`	`542`	`}`
`543`	`543`	`}`
`544`	`544`
`545`		`-#if $BorrowingSwitch`
	`545`	`+#if hasFeature(BorrowingSwitch)`
`546`	`546`	`extension Optional where Wrapped: ~Copyable {`
`547`	`547`	/// Returns a Boolean value indicating whether an argument matches `nil`.
`548`	`548`	`///`