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/// A macro for concisely constructing YSCL nodes.
///
/// ## Usage
///
/// ```rust
/// use yscl::prelude::*;
///
/// let atom = yscl_node!("hello");
/// let atom_verbose = Node::Atom(Atom { value: "hello".to_string() });
/// assert_eq!(atom, atom_verbose);
/// ```
///
/// ## More examples
///
/// Maps
///
/// ```rust
/// # use yscl::prelude::*;
/// let map = yscl_node!({
/// hello = "world",
/// this_is = "a map"
/// });
/// let map_verbose = Node::Map(Map { entries: vec![
/// MapEntry {
/// key: Identifier::new("hello".to_string()).unwrap(),
/// value: Node::Atom(Atom { value: "world".to_string() }),
/// },
/// MapEntry {
/// key: Identifier::new("this_is".to_string()).unwrap(),
/// value: Node::Atom(Atom { value: "a map".to_string() }),
/// },
/// ]});
/// assert_eq!(map, map_verbose);
/// ```
///
/// Lists
///
/// ```rust
/// # use yscl::prelude::*;
/// let list = yscl_node!([
/// "hello",
/// "world"
/// ]);
/// let list_verbose = Node::List(List { elements: vec![
/// Node::Atom(Atom { value: "hello".to_string() }),
/// Node::Atom(Atom { value: "world".to_string() }),
/// ]});
/// assert_eq!(list, list_verbose);
/// ```
///
/// Nested
///
/// ```rust
/// # use yscl::prelude::*;
/// let complex = yscl_node!({
/// kantu_version = "1.0.0",
/// name = "fibonacci",
/// license = [
/// "MIT",
/// "Apache-2.0"
/// ],
/// dependencies = {
/// yscl = "1.0.0",
/// json = "1.0.0"
/// },
/// author = "xeklan (黒🐑)"
/// });
///
/// let complex_verbose = Node::Map(Map {
/// entries: vec![
/// MapEntry {
/// key: Identifier::new("kantu_version".to_owned()).unwrap(),
/// value: Node::Atom(
/// Atom {
/// value: "1.0.0".to_owned(),
/// },
/// ),
/// },
/// MapEntry {
/// key: Identifier::new("name".to_owned()).unwrap(),
/// value: Node::Atom(
/// Atom {
/// value: "fibonacci".to_owned(),
/// },
/// ),
/// },
/// MapEntry {
/// key: Identifier::new("license".to_owned()).unwrap(),
/// value: Node::List(
/// List {
/// elements: vec![
/// Node::Atom(
/// Atom {
/// value: "MIT".to_owned(),
/// },
/// ),
/// Node::Atom(
/// Atom {
/// value: "Apache-2.0".to_owned(),
/// },
/// ),
/// ],
/// },
/// ),
/// },
/// MapEntry {
/// key: Identifier::new("dependencies".to_owned()).unwrap(),
/// value: Node::Map(
/// Map {
/// entries: vec![
/// MapEntry {
/// key: Identifier::new("yscl".to_owned()).unwrap(),
/// value: Node::Atom(
/// Atom {
/// value: "1.0.0".to_owned(),
/// },
/// ),
/// },
/// MapEntry {
/// key: Identifier::new("json".to_owned()).unwrap(),
/// value: Node::Atom(
/// Atom {
/// value: "1.0.0".to_owned(),
/// },
/// ),
/// },
/// ],
/// },
/// ),
/// },
/// MapEntry {
/// key: Identifier::new("author".to_owned()).unwrap(),
/// value: Node::Atom(
/// Atom {
/// value: "xeklan (黒🐑)".to_owned(),
/// },
/// ),
/// },
/// ],
/// });
///
/// assert_eq!(complex, complex_verbose);
/// ```
///
/// ## Limitations
/// Trailing commas are currently not supported.
/// However, if someone wants to implement this, I'd be happy to accept a PR.