BIND/NEW fails inside FUNCTION body

[giuliolunati]

f: function [] [ a: 0 bind/new 'b 'a ] f
=>
** Internal Error: locked series expansion
(Obviously enough, func works well.)

[hostilefork]

(Obviously enough, func works well.)

Unfortunately, it's not necessarily obvious!

Currently BIND is a mutating operation, on the code you run it on. That means if you are to rebind a function body, you will be rebinding it for all calls to that function. I don't like this (at least most of the time, it's not what you want).

This is why I've spoken about "virtual binding" so much. I had suggested maybe IN would be non-mutating (hence allowed on const/locked arrays) while BIND would be mutating (not allowed on const/locked arrays).

Thinking about what are the rules of the Rebol game is hard, I do not know if you read this:

https://forum.rebol.info/t/compatibility-map-each-and-problems-therewith/1192

Binding needs a lot of thought... I'm thinking on it (!)