[racket] Another basic TR question

I've removed a lot of possibly-irrelevant stuff and boiled my current obstacle down to the following:

In #lang racket, the following works fine:

(for/sum [[ii 300]]
  pi)



In #lang typed/racket, I try to do the same thing:

(for/sum: : Flonum [[ii : Index 300]]
  pi)

and I get the type error "Expected Flonum, but got Zero".  Where is there a zero anywhere in this code?  And even if there were a zero, shouldn't Zero be a subtype of Flonum?

Don't tell me the Zero I'm running into is the initial value of for/sum's hidden accumulator....


Stephen Bloch
sbloch at adelphi.edu
GPG  key at http://adelphi.edu/sbloch/sbloch.pubkey.asc

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