Re: ((cadr lst) (car lst) (caddr lst)) Won't work

[Charles Turner <chturne at gmail dot com>]

You could also do this without having to use EVAL by writing (list 1 +
2) instead of '(1 + 2), looked like you perhaps misunderstood the
QUOTE special form.

I attach a patch that cleans up the error message.

Charles.

On 13 June 2013 08:12, Per Bothner <per@bothner.com> wrote:
> On 06/12/2013 06:18 PM, Morven Sun wrote:
>>
>> After I defined (define lst '(1 + 2)),
>> ((cadr lst) (car lst) (caddr lst)) would not work as (+ 1 2), but
>> gives the error msg:
>> Argument '+' to 'apply-to-args' has wrong type
>
>
> Note the actual error message is:
>
> Argument  '+' to 'apply-to-args' has wrong type (gnu.mapping.SimpleSymbol)
> (expected: procedure)
>
> This should have given you a hint as to the problem.
> True - the raw Java classname "gnu.mapping.SimpleSymbol" is not
> as obvious as I'd like.  I'm considering defining a new type
> alias simple-symbol for SimpleSymbol, which would improve the
> error message to:
>
> Argument  '+' to 'apply-to-args' has wrong type (simple-ymbol) (expected:
> procedure)
> --
>         --Per Bothner
> per@bothner.com   http://per.bothner.com/

Attachment: simple_symbol.patch
Description: Binary data