Change how local variables compile at the prompt that's inside the
debug repl? You should have the complete set of them, I think. Compile
them into looking into a table other than the namespace.

Robby


On Wed, Jan 11, 2017 at 5:41 PM, Alex Knauth <alexan...@knauth.org> wrote:
> Hello,
>
> I want to shadow instead of mutate.
>
> The ideal solution would be to create a new environment that extends the old
> one, so that new definitions in the new environment shadow the old
> definitions instead of mutating them.
>
> But if that isn't feasible with the way namespaces work right now, is there
> a way to copy a namespace so that mutating the copy doesn't mutate the
> original? If there isn't, is there a way to functionally update a namespace
> to add new definitions?
>
> I need this for my debug-repl package so I avoid mangling the namespace in
> examples like this:
>
>> (define x 1)
>> x
> 1 ; outside the debug-repl, x is 1
>> (define (f x) (debug-repl))
>> (f 2)
> -> x
> 2 ; inside the debug-repl, x is 2
> -> ; exit the debug-repl
>> x
> 2 ; x should be 1, but it mangled the namespace
>
> Is there a way to do this without mangling the original namespace?
>
> Alex Knauth
>
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