UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3129.0 Safari/537.36

Steps to reproduce the problem:
1. Evaluate `[a] = {a:1}` in the Console

What is the expected behavior?
Console outputs more useful information. For example, Firefox outputs `TypeError: ({a:1}) is not iterable`

What went wrong?
Console outputs `Uncaught TypeError: undefined is not a function at <anonymous>:1:1`

Did this work before? No 

Chrome version: 61.0.3129.0  Channel: canary
OS Version: OS X 10.12.5
Flash Version: 

source: https://twitter.com/bfred_it/status/874805874568470529