Struct Stamp 

pub struct Stamp {
    pub abi: String,
    pub source: String,
}

WT.3: what a cached artifact was built from and against.

The stamp used to record only the source fingerprint, which left one case unrepresentable and therefore invisible: a source that did not change, built against an ABI that did. That artifact looked current, was loaded, failed to instantiate, and said nothing — which is the whole reported failure.

Rendered as two prefixed lines so it stays greppable by a human looking at a broken install, and so a later field can be added without another format break:

abi:1c4e9f2a70b3d581
source:mtime:1756...:files:12

Fields

abi: String

The lattice-wit package fingerprint the component was compiled against.

source: String

The source-tree fingerprint from source_stamp.

Implementations

impl Stamp

pub fn current(source_dir: &Path) -> Self

The stamp for source_dir as built by this lattice, right now.

pub fn parse(text: &str) -> Option<Self>

Parse a stamp file’s contents.

None for anything without both fields — which includes every stamp written by a lattice predating this slice. That is deliberate and is the conservative direction: an unparseable stamp makes no claim, so the artifact is rebuilt rather than trusted. Treating a legacy stamp as a match would keep exactly the artifacts most likely to be skewed.

Trait Implementations

impl Clone for Stamp

fn clone(&self) -> Stamp

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Stamp

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

Formats the value using the given formatter.

impl Eq for Stamp

impl PartialEq for Stamp

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Stamp