> On Jan 24, 2018, at 12:57 AM, Ryan Culpepper <ry...@ccs.neu.edu>
> wrote:
>
> It might make sense to `(set! new-parameterization #f)` at the end so
> that the parameterization (and the values it holds) can be GC'd sooner
> when splicing-parameterize is used at top level or module level.
The tricky thing about doing this is maintaining the evaluation result.
If I add a (set! new-parameterization #f) to the end of
splicing-parameterize, then this:
(let ()
(splicing-parameterize ([my-param #t])
42))
...evaluates to #<void> instead of 42. It’s theoretically possible to
figure out if the last form is a definition or an expression, and if
it’s the latter, insert a use of begin0, but this means the final
expression is not called in tail position. This probably isn’t a
problem, though, so maybe it’s still worth it?
Alexis
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