Re: The purpose of makunbound

[Kelly Dean]

Stefan Monnier wrote:
>> What's the use case of doing makunbound on a dynamically let-bound variable?
>
> What's the use case for disallowing it?

Catching errors. If some code F does makunbound on a symbol that it assumes is 
currently used as the global variable, but F is called from some other code 
that dynamically let-binds the symbol, then F will accidentally set the dynamic 
variable to the special unboundedness value rather than unbind the global 
variable.

If that's a bogus thing to do, then by disallowing it, the interpreter could 
catch the error. But if there's a legitimate use case for it, then of course it 
must be allowed. Is there one?