Namespaced exports reported as duplicate identifiers

[aryzing]

// AB.ts
export type A = {};
export type B = {};

// ABFeature.ts
export type * as AB from "./AB.ts";

// foo.ts
export type A = {};

// index.ts
export * from "ABFeature.ts"; // Error: duplicate identifier `A`
export * from "foo.ts";       // Error: duplicate identifier `A`

There are no duplicate identifiers. Symbol A can't be accessed through ABFeature.ts, and can only be accessed as AB.A.