Struct Envelope 

pub struct Envelope {
    pub format: u32,
    pub name: String,
    pub description: Option<String>,
    pub author: Option<String>,
    pub spec: Option<Value>,
    pub source: Option<String>,
    pub config: Option<Value>,
    pub universe: Option<Universe>,
    pub engine_version: Option<String>,
}

The parsed envelope document. Field presence mirrors the JSON; semantic validation (version, exactly-one-of spec/source, a well-formed spec) is done by check, not by deserialization alone.

Fields

format: u32

Envelope format version. Must equal FORMAT_VERSION.

name: String

Human-readable strategy name (must be non-empty).

description: Option<String>

author: Option<String>

spec: Option<Value>

A lowered Expr tree. Exactly one of spec / source must be present.

source: Option<String>

Lemon source text. Exactly one of spec / source must be present.

config: Option<Value>

Engine config knobs (fees, delist, etc.). Opaque at the language layer — the engine/runner interprets it; here we only require it be an object.

universe: Option<Universe>

engine_version: Option<String>

Free-form engine-version pin for reproducibility (e.g. "yuzu-core 0.4").

Trait Implementations

impl Debug for Envelope

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Envelope

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.