stdlib: Backward deployment of Span and RawSpan

slavapestov · slavapestov · commit 4d8b4992ac5d · 2025-03-05T15:17:35.000-05:00
diff --git a/stdlib/public/core/Span/RawSpan.swift b/stdlib/public/core/Span/RawSpan.swift
@@ -22,7 +22,8 @@ import Swift
 /// owning the contiguous memory, ensuring temporal safety and avoiding
 /// use-after-free errors. Operations on `RawSpan` are bounds-checked,
 /// ensuring spcial safety and avoiding buffer overflow errors.
-@available(SwiftStdlib 6.1, *)
+@available(SwiftStdlib 5.0, *)
+@_originallyDefinedIn(module: "Swift", _linkerModule: "Compatibility62", SwiftStdlib 6.0)
 @frozen
 @safe
 public struct RawSpan: ~Escapable, Copyable, BitwiseCopyable {
@@ -83,10 +84,10 @@ public struct RawSpan: ~Escapable, Copyable, BitwiseCopyable {
   }
 }
 
-@available(SwiftStdlib 6.1, *)
+@available(SwiftStdlib 5.0, *)
 extension RawSpan: @unchecked Sendable {}
 
-@available(SwiftStdlib 6.1, *)
+@available(SwiftStdlib 5.0, *)
 extension RawSpan {
 
   /// Unsafely create a `RawSpan` over initialized memory.
@@ -302,7 +303,7 @@ extension RawSpan {
   }
 }
 
-@available(SwiftStdlib 6.1, *)
+@available(SwiftStdlib 5.0, *)
 extension RawSpan {
 
   /// The number of bytes in the span.
@@ -331,7 +332,7 @@ extension RawSpan {
 }
 
 // MARK: extracting sub-spans
-@available(SwiftStdlib 6.1, *)
+@available(SwiftStdlib 5.0, *)
 extension RawSpan {
 
   /// Constructs a new span over the bytes within the supplied range of
@@ -441,7 +442,7 @@ extension RawSpan {
   }
 }
 
-@available(SwiftStdlib 6.1, *)
+@available(SwiftStdlib 5.0, *)
 extension RawSpan {
 
   /// Calls the given closure with a pointer to the underlying bytes of
@@ -466,7 +467,7 @@ extension RawSpan {
   }
 }
 
-@available(SwiftStdlib 6.1, *)
+@available(SwiftStdlib 5.0, *)
 extension RawSpan {
 
   /// View the bytes of this span as type `T`
@@ -498,7 +499,7 @@ extension RawSpan {
 }
 
 // MARK: load
-@available(SwiftStdlib 6.1, *)
+@available(SwiftStdlib 5.0, *)
 extension RawSpan {
 
   /// Returns a new instance of the given type, constructed from the raw memory
@@ -612,7 +613,7 @@ extension RawSpan {
   }
 }
 
-@available(SwiftStdlib 6.1, *)
+@available(SwiftStdlib 5.0, *)
 extension RawSpan {
   /// Returns a Boolean value indicating whether two `RawSpan` instances
   /// refer to the same region in memory.
@@ -644,7 +645,7 @@ extension RawSpan {
 }
 
 // MARK: prefixes and suffixes
-@available(SwiftStdlib 6.1, *)
+@available(SwiftStdlib 5.0, *)
 extension RawSpan {
 
   /// Returns a span containing the initial bytes of this span,
diff --git a/stdlib/public/core/Span/Span.swift b/stdlib/public/core/Span/Span.swift
@@ -23,7 +23,8 @@ import Swift
 /// use-after-free errors. Operations on `Span` are bounds-checked,
 /// ensuring spcial safety and avoiding buffer overflow errors.
 @frozen
-@available(SwiftStdlib 6.1, *)
+@available(SwiftStdlib 5.0, *)
+@_originallyDefinedIn(module: "Swift", _linkerModule: "Compatibility62", SwiftStdlib 6.0)
 @safe
 public struct Span<Element: ~Copyable & ~Escapable>
 : ~Escapable, Copyable, BitwiseCopyable {
@@ -85,10 +86,10 @@ public struct Span<Element: ~Copyable & ~Escapable>
   }
 }
 
-@available(SwiftStdlib 6.1, *)
+@available(SwiftStdlib 5.0, *)
 extension Span: @unchecked Sendable where Element: Sendable {}
 
-@available(SwiftStdlib 6.1, *)
+@available(SwiftStdlib 5.0, *)
 extension Span where Element: ~Copyable {
 
   /// Unsafely create a `Span` over initialized memory.
@@ -162,7 +163,7 @@ extension Span where Element: ~Copyable {
   }
 }
 
-@available(SwiftStdlib 6.1, *)
+@available(SwiftStdlib 5.0, *)
 extension Span {
 
   /// Unsafely create a `Span` over initialized memory.
@@ -206,7 +207,7 @@ extension Span {
   }
 }
 
-@available(SwiftStdlib 6.1, *)
+@available(SwiftStdlib 5.0, *)
 extension Span where Element: BitwiseCopyable {
 
   /// Unsafely create a `Span` over initialized memory.
@@ -361,7 +362,7 @@ extension Span where Element: BitwiseCopyable {
   }
 }
 
-@available(SwiftStdlib 6.1, *)
+@available(SwiftStdlib 5.0, *)
 extension Span where Element: ~Copyable {
 
   /// The number of elements in the span.
@@ -392,7 +393,7 @@ extension Span where Element: ~Copyable {
   }
 }
 
-@available(SwiftStdlib 6.1, *)
+@available(SwiftStdlib 5.0, *)
 extension Span where Element: ~Copyable {
 
   /// Accesses the element at the specified position in the `Span`.
@@ -439,7 +440,7 @@ extension Span where Element: ~Copyable {
   }
 }
 
-@available(SwiftStdlib 6.1, *)
+@available(SwiftStdlib 5.0, *)
 extension Span where Element: BitwiseCopyable {
 
   /// Accesses the element at the specified position in the `Span`.
@@ -480,7 +481,7 @@ extension Span where Element: BitwiseCopyable {
 }
 
 // MARK: sub-spans
-@available(SwiftStdlib 6.1, *)
+@available(SwiftStdlib 5.0, *)
 extension Span where Element: ~Copyable {
 
   /// Constructs a new span over the items within the supplied range of
@@ -594,7 +595,7 @@ extension Span where Element: ~Copyable {
 }
 
 // MARK: UnsafeBufferPointer access hatch
-@available(SwiftStdlib 6.1, *)
+@available(SwiftStdlib 5.0, *)
 extension Span where Element: ~Copyable  {
 
   /// Calls a closure with a pointer to the viewed contiguous storage.
@@ -624,7 +625,7 @@ extension Span where Element: ~Copyable  {
   }
 }
 
-@available(SwiftStdlib 6.1, *)
+@available(SwiftStdlib 5.0, *)
 extension Span where Element: BitwiseCopyable {
 
   /// Calls the given closure with a pointer to the underlying bytes of
@@ -651,7 +652,7 @@ extension Span where Element: BitwiseCopyable {
   }
 }
 
-@available(SwiftStdlib 6.1, *)
+@available(SwiftStdlib 5.0, *)
 extension Span where Element: ~Copyable {
   /// Returns a Boolean value indicating whether two `Span` instances
   /// refer to the same region in memory.
@@ -684,7 +685,7 @@ extension Span where Element: ~Copyable {
 }
 
 // MARK: prefixes and suffixes
-@available(SwiftStdlib 6.1, *)
+@available(SwiftStdlib 5.0, *)
 extension Span where Element: ~Copyable {
 
   /// Returns a span containing the initial elements of this span,

Original file line number	Diff line number	Diff line change
`@@ -22,7 +22,8 @@ import Swift`
`22`	`22`	`/// owning the contiguous memory, ensuring temporal safety and avoiding`
`23`	`23`	/// use-after-free errors. Operations on `RawSpan` are bounds-checked,
`24`	`24`	`/// ensuring spcial safety and avoiding buffer overflow errors.`
`25`		`-@available(SwiftStdlib 6.1, *)`
	`25`	`+@available(SwiftStdlib 5.0, *)`
	`26`	`+@_originallyDefinedIn(module: "Swift", _linkerModule: "Compatibility62", SwiftStdlib 6.0)`
`26`	`27`	`@frozen`
`27`	`28`	`@safe`
`28`	`29`	`public struct RawSpan: ~Escapable, Copyable, BitwiseCopyable {`
`@@ -83,10 +84,10 @@ public struct RawSpan: ~Escapable, Copyable, BitwiseCopyable {`
`83`	`84`	`}`
`84`	`85`	`}`
`85`	`86`
`86`		`-@available(SwiftStdlib 6.1, *)`
	`87`	`+@available(SwiftStdlib 5.0, *)`
`87`	`88`	`extension RawSpan: @unchecked Sendable {}`
`88`	`89`
`89`		`-@available(SwiftStdlib 6.1, *)`
	`90`	`+@available(SwiftStdlib 5.0, *)`
`90`	`91`	`extension RawSpan {`
`91`	`92`
`92`	`93`	/// Unsafely create a `RawSpan` over initialized memory.
`@@ -302,7 +303,7 @@ extension RawSpan {`
`302`	`303`	`}`
`303`	`304`	`}`
`304`	`305`
`305`		`-@available(SwiftStdlib 6.1, *)`
	`306`	`+@available(SwiftStdlib 5.0, *)`
`306`	`307`	`extension RawSpan {`
`307`	`308`
`308`	`309`	`/// The number of bytes in the span.`
`@@ -331,7 +332,7 @@ extension RawSpan {`
`331`	`332`	`}`
`332`	`333`
`333`	`334`	`// MARK: extracting sub-spans`
`334`		`-@available(SwiftStdlib 6.1, *)`
	`335`	`+@available(SwiftStdlib 5.0, *)`
`335`	`336`	`extension RawSpan {`
`336`	`337`
`337`	`338`	`/// Constructs a new span over the bytes within the supplied range of`
`@@ -441,7 +442,7 @@ extension RawSpan {`
`441`	`442`	`}`
`442`	`443`	`}`
`443`	`444`
`444`		`-@available(SwiftStdlib 6.1, *)`
	`445`	`+@available(SwiftStdlib 5.0, *)`
`445`	`446`	`extension RawSpan {`
`446`	`447`
`447`	`448`	`/// Calls the given closure with a pointer to the underlying bytes of`
`@@ -466,7 +467,7 @@ extension RawSpan {`
`466`	`467`	`}`
`467`	`468`	`}`
`468`	`469`
`469`		`-@available(SwiftStdlib 6.1, *)`
	`470`	`+@available(SwiftStdlib 5.0, *)`
`470`	`471`	`extension RawSpan {`
`471`	`472`
`472`	`473`	/// View the bytes of this span as type `T`
`@@ -498,7 +499,7 @@ extension RawSpan {`
`498`	`499`	`}`
`499`	`500`
`500`	`501`	`// MARK: load`
`501`		`-@available(SwiftStdlib 6.1, *)`
	`502`	`+@available(SwiftStdlib 5.0, *)`
`502`	`503`	`extension RawSpan {`
`503`	`504`
`504`	`505`	`/// Returns a new instance of the given type, constructed from the raw memory`
`@@ -612,7 +613,7 @@ extension RawSpan {`
`612`	`613`	`}`
`613`	`614`	`}`
`614`	`615`
`615`		`-@available(SwiftStdlib 6.1, *)`
	`616`	`+@available(SwiftStdlib 5.0, *)`
`616`	`617`	`extension RawSpan {`
`617`	`618`	/// Returns a Boolean value indicating whether two `RawSpan` instances
`618`	`619`	`/// refer to the same region in memory.`
`@@ -644,7 +645,7 @@ extension RawSpan {`
`644`	`645`	`}`
`645`	`646`
`646`	`647`	`// MARK: prefixes and suffixes`
`647`		`-@available(SwiftStdlib 6.1, *)`
	`648`	`+@available(SwiftStdlib 5.0, *)`
`648`	`649`	`extension RawSpan {`
`649`	`650`
`650`	`651`	`/// Returns a span containing the initial bytes of this span,`
Original file line number	Diff line number	Diff line change
`@@ -23,7 +23,8 @@ import Swift`
`23`	`23`	/// use-after-free errors. Operations on `Span` are bounds-checked,
`24`	`24`	`/// ensuring spcial safety and avoiding buffer overflow errors.`
`25`	`25`	`@frozen`
`26`		`-@available(SwiftStdlib 6.1, *)`
	`26`	`+@available(SwiftStdlib 5.0, *)`
	`27`	`+@_originallyDefinedIn(module: "Swift", _linkerModule: "Compatibility62", SwiftStdlib 6.0)`
`27`	`28`	`@safe`
`28`	`29`	`public struct Span<Element: ~Copyable & ~Escapable>`
`29`	`30`	`: ~Escapable, Copyable, BitwiseCopyable {`
`@@ -85,10 +86,10 @@ public struct Span<Element: ~Copyable & ~Escapable>`
`85`	`86`	`}`
`86`	`87`	`}`
`87`	`88`
`88`		`-@available(SwiftStdlib 6.1, *)`
	`89`	`+@available(SwiftStdlib 5.0, *)`
`89`	`90`	`extension Span: @unchecked Sendable where Element: Sendable {}`
`90`	`91`
`91`		`-@available(SwiftStdlib 6.1, *)`
	`92`	`+@available(SwiftStdlib 5.0, *)`
`92`	`93`	`extension Span where Element: ~Copyable {`
`93`	`94`
`94`	`95`	/// Unsafely create a `Span` over initialized memory.
`@@ -162,7 +163,7 @@ extension Span where Element: ~Copyable {`
`162`	`163`	`}`
`163`	`164`	`}`
`164`	`165`
`165`		`-@available(SwiftStdlib 6.1, *)`
	`166`	`+@available(SwiftStdlib 5.0, *)`
`166`	`167`	`extension Span {`
`167`	`168`
`168`	`169`	/// Unsafely create a `Span` over initialized memory.
`@@ -206,7 +207,7 @@ extension Span {`
`206`	`207`	`}`
`207`	`208`	`}`
`208`	`209`
`209`		`-@available(SwiftStdlib 6.1, *)`
	`210`	`+@available(SwiftStdlib 5.0, *)`
`210`	`211`	`extension Span where Element: BitwiseCopyable {`
`211`	`212`
`212`	`213`	/// Unsafely create a `Span` over initialized memory.
`@@ -361,7 +362,7 @@ extension Span where Element: BitwiseCopyable {`
`361`	`362`	`}`
`362`	`363`	`}`
`363`	`364`
`364`		`-@available(SwiftStdlib 6.1, *)`
	`365`	`+@available(SwiftStdlib 5.0, *)`
`365`	`366`	`extension Span where Element: ~Copyable {`
`366`	`367`
`367`	`368`	`/// The number of elements in the span.`
`@@ -392,7 +393,7 @@ extension Span where Element: ~Copyable {`
`392`	`393`	`}`
`393`	`394`	`}`
`394`	`395`
`395`		`-@available(SwiftStdlib 6.1, *)`
	`396`	`+@available(SwiftStdlib 5.0, *)`
`396`	`397`	`extension Span where Element: ~Copyable {`
`397`	`398`
`398`	`399`	/// Accesses the element at the specified position in the `Span`.
`@@ -439,7 +440,7 @@ extension Span where Element: ~Copyable {`
`439`	`440`	`}`
`440`	`441`	`}`
`441`	`442`
`442`		`-@available(SwiftStdlib 6.1, *)`
	`443`	`+@available(SwiftStdlib 5.0, *)`
`443`	`444`	`extension Span where Element: BitwiseCopyable {`
`444`	`445`
`445`	`446`	/// Accesses the element at the specified position in the `Span`.
`@@ -480,7 +481,7 @@ extension Span where Element: BitwiseCopyable {`
`480`	`481`	`}`
`481`	`482`
`482`	`483`	`// MARK: sub-spans`
`483`		`-@available(SwiftStdlib 6.1, *)`
	`484`	`+@available(SwiftStdlib 5.0, *)`
`484`	`485`	`extension Span where Element: ~Copyable {`
`485`	`486`
`486`	`487`	`/// Constructs a new span over the items within the supplied range of`
`@@ -594,7 +595,7 @@ extension Span where Element: ~Copyable {`
`594`	`595`	`}`
`595`	`596`
`596`	`597`	`// MARK: UnsafeBufferPointer access hatch`
`597`		`-@available(SwiftStdlib 6.1, *)`
	`598`	`+@available(SwiftStdlib 5.0, *)`
`598`	`599`	`extension Span where Element: ~Copyable {`
`599`	`600`
`600`	`601`	`/// Calls a closure with a pointer to the viewed contiguous storage.`
`@@ -624,7 +625,7 @@ extension Span where Element: ~Copyable {`
`624`	`625`	`}`
`625`	`626`	`}`
`626`	`627`
`627`		`-@available(SwiftStdlib 6.1, *)`
	`628`	`+@available(SwiftStdlib 5.0, *)`
`628`	`629`	`extension Span where Element: BitwiseCopyable {`
`629`	`630`
`630`	`631`	`/// Calls the given closure with a pointer to the underlying bytes of`
`@@ -651,7 +652,7 @@ extension Span where Element: BitwiseCopyable {`
`651`	`652`	`}`
`652`	`653`	`}`
`653`	`654`
`654`		`-@available(SwiftStdlib 6.1, *)`
	`655`	`+@available(SwiftStdlib 5.0, *)`
`655`	`656`	`extension Span where Element: ~Copyable {`
`656`	`657`	/// Returns a Boolean value indicating whether two `Span` instances
`657`	`658`	`/// refer to the same region in memory.`
`@@ -684,7 +685,7 @@ extension Span where Element: ~Copyable {`
`684`	`685`	`}`
`685`	`686`
`686`	`687`	`// MARK: prefixes and suffixes`
`687`		`-@available(SwiftStdlib 6.1, *)`
	`688`	`+@available(SwiftStdlib 5.0, *)`
`688`	`689`	`extension Span where Element: ~Copyable {`
`689`	`690`
`690`	`691`	`/// Returns a span containing the initial elements of this span,`