ErrorWithCause
public protocol ErrorWithCause : ErrorUndocumented
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                  Depending on error type, returns an Errorobject, cause of the current error.DeclarationSwift var error: Swift.Error? { get }
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                  underlyingErrorExtension methodGet the first error cause DeclarationSwift public var underlyingError: Swift.Error? { get }
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                  errorStackExtension methodGet all error stack DeclarationSwift public var errorStack: [Swift.Error]? { get }
 ErrorWithCause Protocol Reference
        ErrorWithCause Protocol Reference