On Jan 15, 2011, at 1:19 PM, Matthias Felleisen wrote:
> 2. I am not strictly opposed to your suggestion because I see value in your 
> reasoning. If we go with re-providing the identifier with its contract, I 
> would like to see the blame assignment shifted to the re-exporting module. 
> This does leave us with the "Carl" question: 
> 
> who is going to be blamed when module C imports f from A and (re-provided 
> from) B? 

It'll be a syntax error.  There's no way to change the positive blame 
information for the contract form that an identifier will expand into without 
changing the binding information.  That's why it'd have to be an explicit 
operation, even if it's inexpensive because the work is done at syntax time 
(just changing the syntax transformer) and not trying to recontract the already 
contracted value with new blame information.

Stevie
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