Throwing an error synchronously within a closure isn't caught -- Streamline bug?

closure_error_.js

console.log('will throw error in one second...');

try {
    // simulate async step here:
    setTimeout(_, 1000);
    
    // then *synchronously* throw error here:
    (function closure() {
        throw new Error();
    })();
} catch (e) {
    // this should kick in, no? it doesn't:
    console.log('successfully received error!');
}

console.log('did it get properly suppressed?');