proc create_source_code_location(String* file, int line, int col) -> Source_Code_Location* {
    if (!file)
        return nullptr;

    Source_Code_Location* ret = new(Source_Code_Location);
    ret->file   = file;
    ret->line   = line;
    ret->column = col;
    return ret;
}

proc Lisp_Object_Type_to_string(Lisp_Object_Type type) -> const char* {
    switch (type) {
    case(Lisp_Object_Type::Nil):          return "nil";
    case(Lisp_Object_Type::T):            return "t";
    case(Lisp_Object_Type::Number):       return "number";
    case(Lisp_Object_Type::String):       return "string";
    case(Lisp_Object_Type::Symbol):       return "symbol";
    case(Lisp_Object_Type::Keyword):      return "keyword";
    case(Lisp_Object_Type::Function):     return "function";
    case(Lisp_Object_Type::CFunction):    return "C-function";
    case(Lisp_Object_Type::Continuation): return "continuation";
    case(Lisp_Object_Type::Pair):         return "pair";
    case(Lisp_Object_Type::Vector):         return "vector";
    }
    return "unknown";
}

proc create_positional_argument_list(int initial_capacity) -> Positional_Arguments {
    Positional_Arguments ret;
    ret.symbols = create_Lisp_Object_array_list(initial_capacity);
    return ret;
}

proc append_to_positional_argument_list(Positional_Arguments* args, Lisp_Object* sym) -> void {
    append_to_array_list(&args->symbols, sym);
}

proc create_keyword_argument_list(int initial_capacity) -> Keyword_Arguments {
    Keyword_Arguments ret;
    ret.keywords = create_Lisp_Object_array_list(initial_capacity);
    ret.values   = create_Lisp_Object_array_list(initial_capacity);
    return ret;
}

proc append_to_keyword_argument_list(Keyword_Arguments* args,
                                     Lisp_Object* keyword,
                                     Lisp_Object* default_value) -> void
{
    append_to_array_list(&args->keywords, keyword);
    append_to_array_list(&args->values, default_value);
}