/// <inheritdoc /> public override TResult AcceptVisitor <TState, TResult>(ITypeSignatureVisitor <TState, TResult> visitor, TState state) => visitor.VisitSentinelType(this, state);
/// <inheritdoc /> public override TResult AcceptVisitor <TResult>(ITypeSignatureVisitor <TResult> visitor) => visitor.VisitSentinelType(this);