Struct Sym 

pub struct Sym(pub u32);

符号（intern 名字 id）。VarRef/Member/MethodRef 的名字字段—— 87% 重复率（实测 jdk-sources：4754 个名字节点仅 669 个唯一）， String→Sym 后：构造去重、比较 u32、clone 零分配（copy_subtree/ clone_node 全线受益）。

Tuple Fields

0: u32

Trait Implementations

impl Clone for Sym

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Sym

impl Debug for Sym

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Sym

fn default() -> Self

Returns the “default value” for a type.

impl Eq for Sym

impl Hash for Sym

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Sym

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Sym