/// <summary>
/// Creates a <see cref="IFunctionScope"/> inside this scope.
/// Its name is automatically extracted from the header that may contain the
/// opening curly brace '{' or not (in such case it is automatically appended).
/// </summary>
/// <param name="this">This scope.</param>
/// <param name="header">The header of the function. Must not be null.</param>
/// <returns>The new function scope.</returns>
public static IFunctionScope CreateFunction(this IFunctionDefinerScope @this, string header)
{
if (header == null)
{
throw new ArgumentNullException(nameof(header));
}
return(@this.CreateFunction(t => t.Append(header)));
}