Re: question about values

[Taylan Kammer]

On 18.03.2020 00:50, Massimiliano Gubinelli wrote:
> (let ((a (values "a" "b" "c"))) a)

The result of (values x y z) is not a kind of object that contains three 
values (like a list or vector).  It's three separate values that would 
need to be put into three separate variables.  But you're only naming 
one variable (a).  So strictly speaking the code is "wrong".

In Guile 1.8, multiple values were actually put into some special kind 
of object (which was not very efficient) so code like that still somehow 
worked even thought it's technically wrong.

Starting from Guile 2.0, providing multiple values in a context where 
only one is expected causes the extra values to be ignored.


Happy to answer further questions about this.  Multiple-values can be a 
tricky concept to grasp because most other programming languages don't 
have it.

- Taylan