[racket] quasisyntax vs quasisyntax/loc

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: tobias.hammer at dlr.de
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