Enum ResultCallableKind 

pub enum ResultCallableKind {
    Map,
    MapErr,
    AndThen,
}

Identifies map / map_err / and_then as the callable-taking Result methods each engine handles inline. Returns None for anything else so the caller can fall through to result_method or the standard dispatcher.

Variants

Map

r.map(f) — Ok(v) becomes Ok(f(v)), Err(e) passes.

MapErr

r.map_err(f) — Err(e) becomes Err(f(e)), Ok(v) passes.

AndThen

r.and_then(f) — Ok(v) becomes f(v) (expected to return a Result), Err(e) passes.