Can blocks using unevaluated variables be nested?

[qw23]

Further to a forum topic on passing a variable by reference I'm wondering if blocks using unevaluated variables can be nested. Let me present an example showing what I mean.

First, a custom block using an unevaluated variable ("Any (unevaluated)", to be precise):

It works like you would expect, the variable itself is updated:

Now suppose a similar custom block (I'm calling it a wrapper) is going to outsource the actual work to another custom block that also takes an unevaluated variable as input:

This however does not work as (at least I) expected (or hoped for ):

I must be doing something wrong.

I tried several variations, involving RUN, CALL, grey rings, e.g.:

... but nothing worked:

Does anyone know how (or if) a wrapper like this can at all be implemented in Snap! ?

[dardoro]

Kind of working

with hand-crafted ref unwinding

More generic ref unwinding (flattening)

used as

[qw23]

Nice approach. FLATTEN REF should be considered a serious candidate for a library, I think (I’m not sure which library though).

[dardoro]

There is a serious issue. Unwinding goes too far...

There is no hidden magic in the treatment of the unevaluated params.
So the simplest form is explicitly passing the actual variable reference by value (applicative order).