Struct Evidence 

pub struct Evidence {
    pub message: String,
    pub pointer: Option<Pointer>,
}

One observation that supports a diagnosis.

message is the human-readable claim; pointer, when present, names the source the claim was derived from. Both fields are owned strings so an Evidence can survive being moved across rule boundaries without lifetime gymnastics.

Fields

message: String

Human-readable observation. Should be a single sentence; rendered as a bullet point in the report’s EVIDENCE: block.

pointer: Option<Pointer>

Where the observation came from. None is allowed for statements derived from multiple sources at once (e.g. “tolerance is 300 s; observed drift 4800 s”) — these are labelled computed in practice.

Implementations

impl Evidence

pub fn new(message: impl Into<String>) -> Self

Construct an evidence item with no source pointer.

Use this for derived statements that do not refer to a specific case field — for example, summary lines computed by the rule itself (“tolerance is 300 s; observed drift 4800 s”).

Examples

use api_debug_lab::Evidence;
let e = Evidence::new("Response status 401 Unauthorized");
assert!(e.pointer.is_none());

pub fn with(message: impl Into<String>, source: impl Into<String>) -> Self

Construct an evidence item that names a logical source but no specific line.

Most rule-emitted evidence uses this form. The source is a logical path into the case (see Pointer::source).

Examples

use api_debug_lab::Evidence;
let e = Evidence::with("Authorization header absent", "request.headers.authorization");
assert_eq!(e.pointer.unwrap().source, "request.headers.authorization");

pub fn at_line( message: impl Into<String>, source: impl Into<String>, line: u32, ) -> Self

Construct an evidence item that points at a specific 1-indexed line of a log file.

This is the form used when a rule has identified a single log line as the smoking gun. The CLI’s explain subcommand renders these as [server.log:42] message.

Examples

use api_debug_lab::Evidence;
let e = Evidence::at_line("timeout entry", "server.log", 3);
assert_eq!(e.pointer.unwrap().line, Some(3));

Trait Implementations

impl Clone for Evidence

fn clone(&self) -> Evidence

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Evidence

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Evidence

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for Evidence

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Evidence

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for Evidence

impl StructuralPartialEq for Evidence