Intellisense does not work with [P in keyof T]

TypeScript Version: 2.1.5

Code

//Operators available for the object fields
export type Operators<T> = {
    $elementMatch?: T | Operators<T>;
    $in?: T[];
}

//Filter declaration. 
export type Filter<T> = {
    //field, you can assign a value, or an operator.
    [P in keyof T]: Operators<T[P]> | T[P];
}

function query<T>(filter: Filter<T>) {  }

//Sample class
class Sample {
    foo: string;
    bar: number;
}

query<Sample>({
    //We want to put on the "foo" operator "$in"
    value: {
        //Intellisense then no output
    }
});

Expected behavior:
Intellisense should display all available options.
For example:
$elementMatch
$in

Actual behavior:
Intellisense does not offer anything.
If the "[P in key of T]" is replaced by "[key: string]", then the Intellisense for operators begins to work, but in this case we lose the test fields.

使用包含 Operators、Filter 和 query 的 TypeScript 2.1.5 示例重现 IntelliSense 失败。首先跟踪映射类型 [P in keyof T] 的补全处理；当 $elementMatch 和 $in 选项出现在运算符对象中，且映射字段检查没有丢失时，即表示完成。