Struct field doesn't exist

struct User { id: u64, name: String }
let u = User { id: 1, name: "ada".into(), email: "a@b".into() };
// E0560: User has no field named `email`

Struct literal syntax must list exactly the declared fields. The compiler refuses unknown names — it's almost always a typo or stale caller after a refactor.

- Remove the extra field from the literal, or add it to the struct definition. - For optional fields, use Option<T> and ..Default::default() to fill the rest. - After renaming a field, search the codebase — the compiler points at every stale call. - For evolving APIs, consider #[non_exhaustive] on the struct so callers must use a constructor.