[racket] future

From: Shriram Krishnamurthi (sk at cs.brown.edu)
Date: Mon Aug 29 21:33:13 EDT 2011

On the contrary, these are introducing new control structures, which is am
extremely legitimate use of a macro. Indeed, the presence of the macro
should alert the reader that control may behave a little differently here.
That these do so by introducing just a thunk is an artifact of how much the
underlying functional primitive does - not the macro's "fault".

Pardon terseness and mistakes -- sent from phone.
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