Struct DeclFingerprint 

pub struct DeclFingerprint {
    pub name: String,
    pub kind: DeclKind,
    pub body_hash: u64,
}

A stable, span-independent identity hash for a top-level declaration.

Two declarations with the same DeclFingerprint are structurally identical modulo source positions. The body_hash is computed over the Debug representation of the inner Decl value (not the surrounding Located<_>), so spans do not contribute to the hash.

Fields

name: String

Declaration name (empty string for anonymous or unnamed decls).

kind: DeclKind

Coarse kind of the declaration.

body_hash: u64

FNV-1a hash of format!("{:?}", located_decl.value).

Because we hash .value (not the Located wrapper), the span is not included in the hash.

Implementations

impl DeclFingerprint

pub fn of(decl: &Located<Decl>) -> Self

Compute the fingerprint of a located declaration.

The body hash is derived from the pretty-printed representation of the inner Decl value via print_decl. This is truly span-independent because print_decl takes &Decl (not &Located<Decl>) and does not print any source positions.

Using format!("{:?}", decl.value) would be incorrect here because Decl contains Located<SurfaceExpr> sub-expressions whose Debug output includes span information, making the hash span-dependent.

pub fn is_modified_version_of(&self, other: &DeclFingerprint) -> bool

Returns true if self and other have the same name and kind but a different body hash — i.e. the body was modified.

Trait Implementations

impl Clone for DeclFingerprint

fn clone(&self) -> DeclFingerprint

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DeclFingerprint

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

Formats the value using the given formatter.

impl Eq for DeclFingerprint

impl Hash for DeclFingerprint

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 DeclFingerprint

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for DeclFingerprint