Struct TypeWitness 

pub struct TypeWitness {
    pub type: String,
    pub witness: Option<Value>,
}

A type witness — a concrete value that satisfies (expected) or violates (found) the type constraint at the diagnostic site, per ADR-006 §9.3.

r#type is the type’s surface name (e.g. "int", "string", "Array<int>"). witness is an optional concrete example value.

For simple primitive types (int, number, bool, string), the emitter is encouraged to populate witness. For recursive / generic / trait-bounded types, witness may be None; the surface name alone communicates the constraint.

Fields

type: String

Surface name of the type ("int", "Option<string>", …).

witness: Option<Value>

Optional concrete value satisfying or violating the constraint. Encoded as a JSON value; LLM consumers parse it directly.

Implementations

impl TypeWitness

pub fn new(type_name: impl Into<String>, witness: Option<Value>) -> Self

Construct a witness from a type name and an optional JSON value.

pub fn type_only(type_name: impl Into<String>) -> Self

Construct a witness with only a type name and no concrete value.

Trait Implementations

impl Clone for TypeWitness

fn clone(&self) -> TypeWitness

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TypeWitness

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for TypeWitness

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for TypeWitness

fn eq(&self, other: &TypeWitness) -> 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 TypeWitness

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for TypeWitness