TypeScript 2.1.4 - error compiling async/await with Promises typed as `this`

[ryanwe]

TypeScript Version: 2.1.4

Code

interface Bar extends Promise<void> {
 foo(): this;
 // also repros with `foo(): Bar;`
}

const buggy = async (param: Bar) => {
 await param.foo();
};

Expected behavior:
In TypeScript 2.0.3 this code will compile successfully.

Actual behavior:
In TypeScript 2.1.4 this code will not compile successfully and gives the error error TS1058: Operand for 'await' does not have a valid callable 'then' member.

[nevir]

FWIW, this crops up for the knex typings, too.
(QueryBuilder implements ChainableInterface implements Promise<any>)

No explicit this references, but lots of self references to QueryBuilder