BabyHint mis-interprets undefined variable as a mis-spelling

Take a look at this simplified example program: https://www.khanacademy.org/computer-programming/oh-noes-misfire/6562709088370688
I usually run into this problem when I carelessly cut and paste code around, and forget to bring the variables that the code snippet depends on. The problem is that oh noes instead of reminding me that (for example) "bw is not defined" gets confused and thinks pos should be pop..
"Oh noes!
Did you mean to type pop instead of pos?
Show me where"