SV: 2D or not 2E

According to HyperSpec, 5d should not be treated as a symbol,
see 2.3.1.1 Potential Numbers as Tokens.

So is is better to avoid using such names.

Pavel Grozman


> -----Ursprungligt meddelande-----
> Fran: Kenny Tilton [mailto:ktilton@xxxxxxxxxx]
> Skickat: den 8 mars 2003 23:24
> Till: cormanlisp@xxxxxxxxxxxxxxx
> Amne: [cormanlisp] 2D or not 2E
>
>
> FYI (and that is no typo below, the compiler complains "no 5E-H" on a
> reference to 5d-h!!! and the subject above comes from the original code
> in which I named a point structure 2d--got to 5D while experimenting
> with variations):
>
> (defstruct 5d
>    (h 0 :type fixnum)
>    (v 0 :type fixnum)
>    )
> 5D
> (let ((p (make-5d :h 1 :v 2)))
>      (setf (5d-h p) 3))
> ;;; An error occurred in function MACROEXPAND:
> ;;; Error: There is no SETF expansion method defined for (5E-H P)
> ;;; Entering Corman Lisp debug loop.
> ;;; Use :C followed by an option to exit. Type :HELP for help.
> ;;; Restart options:
> ;;; 1   Abort to top level.
> :c 1
>
> ;;; Returning to top level loop.
> (defstruct 5k
>    (h 0 :type fixnum)
>    (v 0 :type fixnum)
>    )
> 5K
> (let ((p (make-5k :h 1 :v 2)))
>      (setf (5k-h p) 3))
> 3
>
> --
>
>   kenny tilton
>   clinisys, inc
>   http://www.tilton-technology.com/
>   ---------------------------------------------------------------
> "Cells let us walk, talk, think, make love and realize
>   the bath water is cold." -- Lorraine Lee Cudmore
>
>
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