[racket] DrRacket indent of "let:"

DrRacket 5.0.2 isn't indenting Typed Racket "let:" forms idiomatically.  
It indents them in the default way rather than a special way like it 
does for Racket "let" forms.

In case anyone wants to fix this, here's how Quack currently indents 
"let:" (leading space characters replaced here with "." so email clients 
don't eat them):

(let: ((x : Any)
.......(y : Any))
..x
..y)

(let: loop : Any ((x : Any)
..................(y : Any))
..x
..y)

(let: loop : Any
......((x : Any)
.......(y : Any))
..x
..y)

(let: loop
....: Any
....((x : Any)
.....(y : Any))
..x
..y)

The difference in indentation of the second line in the 3rd and 4th 
examples is an accident of how some existing Emacs code works, not a 
decision on my part.  In that regard, I would probably change Quack to 
do whatever Racket ultimately does.

-- 
http://www.neilvandyke.org/