[Larceny-users] error loading srfi-19 from r5 repl

[Felix Klock]

Marco-

On Jan 6, 2009, at 2:48 PM, Marco Maggi wrote:

> Sorry if this turns out to be my bad understanting
> of the documentation.  At the REPL I get:
>
> $ larceny
> ...
>> (require 'srfi-19)
> Error: Undefined global variable "srfi-6"
>
> and I notice that "(require 'srfi-6)" loads the
> SRFI with no errors.


My memory is that one needs to load or require srfi-0 in some manner  
before loading or requiring srfi-19.

 > (require 'srfi-0)
#t
 > (require 'srfi-19)
#t

Every time this problem has bitten me, I've had to look at the source  
code to figure out why its happening.

I believe the reason that srfi-19 does not do (require 'srfi-0) itself  
[[even though it *does* do (require 'time) itself]] is that srfi-0  
provides syntax definitions, and so adding that require invocation  
would only solve the problem for dynamic loading of the source text,  
but not for compiling the file ahead of time.

Having said that, the current situation does not seem terribly  
desirable to me.  I'll let Will decide whether he'd prefer to fix this  
by documenting the requirement, or adding a macro to srfi-6's source  
code that statically checks that srfi-0 has been loaded at expansion  
time, or some other solution to avoid the confusing behavior that you  
described, Marco.

-Felix