Standard Error struct

Problem

You want consistent, idiomatic error payloads that are easy to pattern-match and inspect.

Idiom: Throw Error { ... } literals

Slug’s standard library defines a conventional Error struct in slug.std. Use struct literals at the throw site so stacktraces point at the exact source line.

throw Error { type: "ValidationError", msg: "name is required" }

Add context via data or chain failures via cause:

var openConfig = fn(path) {
    defer onerror(err) {
        // Wrap and rethrow with context
        throw Error { type: "ConfigError", msg: "failed to open config", data: { path: path }, cause: err }
    }

    readFile(path) // throws its own Error on failure
}