TypeScript Version: 2.7.0-dev.201xxxxx

Code

    /** @type {!Set<function()>} */
    this._listeners = new Set();

Expected behavior:
No error, strongly typed this._listeners

Actual behavior:

front_end/bindings/BlackboxManager.js(22,21): error TS1005: '>' expected.

(A parse error on function claiming a closing > is expected)