[Rd] Capturing environment associated with a promise

[Hadley Wickham]

> Promises are an implementation detail -- we need to be able to change
> them, optimize them away, etc, so there is a limit on what we want to
> expose.  Allowing a query of whether a binding is delayed or not
> should be OK but would want to think that through more carefully
> before committing to this.

Ok, thanks.

Hadley


-- 
RStudio / Rice University
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