a little parsing challenge ☺

[python at bdurham.com]

Xah,

1. Is the following string considered legal?

[ { ( ] ) }

Note: Each type of brace opens and closes in the proper sequence. But
inter-brace opening and closing does not make sense.

Or must a closing brace always balance out with the most recent opening
brace like so?

[ { ( ) } ]

2. If there are multiple unclosed braces at EOF, is the answer you're
looking for the position of the first open brace that hasn't been closed
out yet?

Malcolm