Variable assignment with destructuring incorrectly marks locals as read

[calebsander]

TypeScript Version: 3.1.0-dev.20180809

Search Terms:
noUnusedLocals
destructuring assignment
declared but its value is never read

Code

// Compile with --noUnusedLocals

{
    const abc = 1 // 'abc' is declared but its value is never read.
    let def: number // 'def' is declared but its value is never read.
    def = 2
}
{
    const {abc} = {abc: 1} // 'abc' is declared but its value is never read.
    let def: number // no compiler error
    ({def} = {def: 2})
}
{
    const [abc] = [1] // 'abc' is declared but its value is never read.
    let def: number // no compiler error
    [def] = [2]
}

Expected behavior:
All 6 variable declarations should cause a compiler error because they are declared but never read. It should not matter whether the variable is assigned to where it is declared, or afterwards.

Actual behavior:
Destructuring assignments to variables after they are declared marks them as read, even though they are only written to. Direct assignments work as expected.

Playground Link:
N/A; playground doesn't support noUnusedLocals