I upgraded as you requested and tried to also upgrade my software.
Previously, I had been allowed to pass quotations around on the stack, store
them in symbols and get them out again, and generally treat them as
first-class datums. Now I'm getting an error message that says: "Got a
computed value where a literal quotation was expected." This is a serious
problem for me because my Forth programming relies heavily upon passing cfa
values (the Forth equivalent of quotations) as parameters, and I'm largely
trying to port Forth to Factor. I think modern terminology refers to these
as "closures," although I'm not very familiar with the computer-sciency
terms that people use nowadays.
Specifically, the problem arises on the definition of traverse is shown
below (see www.rosycrew.org/list.factor for the entire program):
<PRIVATE
SYMBOLS: first-node toucher ; ! these parameters
are unchanging throughout recursion
: <traverse> ( node -- )
dup fore>> swap ! --
next-node node
toucher get call ! --
next-node
dup first-node get eq? [ drop ] [ <traverse> ] if ;
inline recursive
! <traverse> gets next-node before calling toucher on node, in case toucher
clobbers the node
PRIVATE>
: traverse ( node toucher -- )
over first-node set toucher set ! -- node
<traverse> ;
> Message: 5
> Date: Thu, 10 Sep 2009 21:44:26 -0500
> From: Slava Pestov <[email protected]>
> Subject: Re: [Factor-talk] confusion
> To: [email protected]
> Message-ID:
> <[email protected]>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Hugh,
>
> Please update to the latest Factor release from the download grid at
> http://factorcode.org. Stack effect declarations are now mandatory,
> and have been since January or so. Your code below won't work with the
> latest Factor.
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