         ) rethrows -> R
 }
 
-@available(iOS 13.0, macOS 10.14, tvOS 13.0, watchOS 6.0, *)
+@available(iOS 9999, OSX 9999, tvOS 9999, watchOS 9999, *)
 public extension _ContiguousCollection {
     func withUnsafeBufferPointer<R>(
         _ body: (UnsafeBufferPointer<Element>) throws -> R


/// A collection that supports mutable access to its underlying contiguous
/// storage.
@available(iOS 13.0, macOS 10.14, tvOS 13.0, watchOS 6.0, *)
public protocol _MutableContiguousCollection: _ContiguousCollection, MutableCollection
where SubSequence: _MutableContiguousCollection {
    /// Calls the given closure with a pointer to the array's mutable contiguous

        ) rethrows -> R
}

@available(iOS 9999, OSX 9999, tvOS 9999, watchOS 9999, *)
extension _MutableContiguousCollection {
    public mutating func withUnsafeMutableBufferPointer<R>(
        _ body: (inout UnsafeMutableBufferPointer<Element>) throws -> R
