IndexSet import { IndexSet } from "destack:ops"; Interface for index assignment a[i] = v. a[i] = v becomes a.indexSet(i, v) through an exclusive receiver. Types that implement IndexSet should typically also implement Index. export newtype interface IndexSet { indexSet(key: I, value: V): void; } language/library/src/ops/subscript.ds:29:32 Members indexSet(key: I, value: V): void Store value at key.