Property used in destructuring assignment marked unused

[ghost]

TypeScript Version: 3.1.0-dev.20180810

Code

class C {
    private x = 0;
    m(): number {
        let x: number;
        ({ x } = this);
        return x;
    }
}

Expected behavior:

No error.

Actual behavior:

src/a.ts:2:13 - error TS6133: 'x' is declared but its value is never read.

2     private x = 0;