/// <summary>
/// Define a function symbol within this scope.
/// </summary>
/// <param name="func">The function metadata</param>
/// <param name="functionExpr">The function expression object that can execute the function</param>
public virtual void DefineFunction(FunctionMetaData func, object functionExpr)
{
_current.DefineFunction(func, functionExpr);
}
/// <summary>
/// Define a function symbol within this scope.
/// </summary>
/// <param name="func">The function metadata</param>
public void DefineFunction(FunctionMetaData func)
{
_current.DefineFunction(func);
}