internal WithField(CSharpPattern pattern, TupleFieldInfo field)
: base(pattern)
{
Field = field;
}
/// <summary>
/// Creates a positional subpattern that matches a component of a tuple.
/// </summary>
/// <param name="pattern">The pattern to apply to the object in the corresponding position.</param>
/// <param name="field">The field in the tuple to match.</param>
/// <returns>A <see cref="PositionalCSharpSubpattern" /> representing a positional subpattern.</returns>
public static PositionalCSharpSubpattern PositionalSubpattern(CSharpPattern pattern, TupleFieldInfo field)
{
RequiresNotNull(pattern, nameof(pattern));
RequiresNotNull(field, nameof(field));
if (field.Index < 0)
{
throw Error.TupleFieldIndexMustBePositive();
}
return(new PositionalCSharpSubpattern.WithField(pattern, field));
}