public static void ReportCannotApplyUnaryOperator(this ICollection <Diagnostic> diagnostics, TextSpan span, UnaryOperatorKind operatorKind, Type type)
{
var operatorName = operatorKind.ToDisplayName();
var argumentTypeName = type.ToDisplayName();
diagnostics.Report(span, DiagnosticId.CannotApplyUnaryOperator, operatorName, argumentTypeName);
}