Thanks for your answer.
Did i understand it correct that neither quasisyntax nor quasisyntax/loc
recognize quasisyntax/loc inside. So if these are used, quasisyntax/loc
must currently be in the outmost layer?
On Tue, 04 Jun 2013 12:07:39 +0200, Matthew Flatt <[email protected]>
wrote:
The problem is that `quasisyntax' doesn't recognize `quasisyntax/loc'
as a kind of quasiquote.
In terms of plain quasiquote, your example is analogous to
> (define-syntax-rule (qq e) (quasiquote e))
> `(qq ,(+ 1 2))
'(qq 3)
as opposed to
> `(quasiquote ,(+ 1 2))
'`,(+ 1 2)
A difference is that `quasisyntax/loc' is predefined --- so, in some
sense, you're not supposed to know that it's a macro, and maybe it
should just work.
Offhand, I can imagine ways to fix the interaction of `quasisyntax' and
`quasisyntax/loc', but I'll have to think it more.
At Tue, 4 Jun 2013 11:52:27 +0200, Tobias Hammer wrote:
Hi,
i have a problem with nested quasisyntax, quasisyntax/loc and unsyntax.
Two quasisyntax with one unsyntax gets me one level up, as expected. But
two quasisyntax/loc with unsyntax somehow gets me to the outmost level.
Can anybody tell me if this is intended or explain why this happens?
Tobias
; --- examples
(define-syntax (noloc stx)
(syntax-case stx ()
[(_)
(let ([var 'outer])
(quasisyntax
(let ([var 'inner])
(quasisyntax
#,var))))]))
(noloc)
> #<syntax:10:29 outer>
(define-syntax (loc stx)
(syntax-case stx ()
[(_)
(let ([var 'outer])
(quasisyntax/loc stx
(let ([var 'inner])
(quasisyntax/loc #'here
#,var))))]))
(loc)
> #<syntax inner>
--
---------------------------------------------------------
Tobias Hammer
DLR / Robotics and Mechatronics Center (RMC)
Muenchner Str. 20, D-82234 Wessling
Tel.: 08153/28-1487
Mail: [email protected]
____________________
Racket Users list:
http://lists.racket-lang.org/users
--
---------------------------------------------------------
Tobias Hammer
DLR / Robotics and Mechatronics Center (RMC)
Muenchner Str. 20, D-82234 Wessling
Tel.: 08153/28-1487
Mail: [email protected]
____________________
Racket Users list:
http://lists.racket-lang.org/users
