[racket] list of safe/unsafe future primitives

safe thing is always the present.  future is too uncertain.

On Wed, Nov 17, 2010 at 6:21 PM, Jon Rafkind <rafkind at cs.utah.edu> wrote:
> Is there a known list of either safe or unsafe futures operations? A
> user wanted to know if a certain operation was ok to use in a future
> (without having to test it) and I couldn't find a list in the docs.
> Could one be made?
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