Type not suggested when implementing an interface's overloaded method

[bruce965]

TypeScript Version: 2.5.2 / nightly (2.6.0-dev.20170910)

Code

interface MyInterface {
	exec(action: 'action_1'): void;
	exec(action: 'action_2'): void;
	exec(action: string): void;
}

const test: MyInterface = {
	exec(arg) {
		// `arg` type is `any`
	}
};

Expected behavior:

I would expect arg type to be "action1"|"action2"|string.

Actual behavior:

arg type is any.

[mhegazy]

Contextual types do not flow from overloads. this issue has been reported in #16019 and there is a proposed change for it in #17819

[RyanCavanaugh]

Declining due to lack of interest.