     }
   }
   
-  @usableFromInline internal var storage: Storage
+  @usableFromInline internal let storage: Storage
   @usableFromInline internal var nextPointer: UnsafeRawPointer
   @usableFromInline internal var endPointer: UnsafeRawPointer
   

  }
}

@frozen @usableFromInline
internal struct _AsyncBytesBuffer: @unchecked Sendable {
  @usableFromInline
  final class Storage: Sendable {
    fileprivate let buffer: UnsafeMutableRawBufferPointer
    
    init(

    }
    try Task.checkCancellation()
    do {
      let readSize: Int = try await readFunction(storage.buffer)
      if readSize == 0 {
        finished = true
