@private on constructor function in a block causes crash

[sandersn]

Crashes when inside a block, but not at toplevel.

{
    /** @private */
    function C() {
        this.x = 1
    }
    new C()
}

Introduced in the recent PR that supports @private in jsdoc.
Behaviour is incorrect at top-level too; @private on a constructor function doesn't make sense, but the compiler gives an error on new C() saying that it can only be constructed inside the class itself. But there is nowhere else to construct the class?