Code that used to work is now failing with a pull of the master today. I can't 
reproduce it in small amounts of code, which makes me think it's another weird 
JIT problem.

I have a harness of this kind:
(define (print-values . vs) (for ([v vs]) (display v) (newline)))
 (with-limits 3600 4096 (call-with-values (lambda () (begin0 (time (analysis 
program)) (dump-memory-stats))) print-values)

The dump is not reached. Instead, (analysis program) finishes with the expected 
number of values, and once those values pass out of the expression, I get an 
error of the following kind:
exn:fail:contract:arity

It expects 1 value instead of the arbitrary amount it should expect for the 
print-values.
I can supply a large amount of code that exercises this behavior, but if this 
is enough to go off, great.
Thanks,
-Ian
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