cannot compile: srfi-10 define-reader-ctor 'hash '#,(

[Jan Nieuwenhuizen <janneke@gnu.org>]

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Hi,

The attached hash.scm works fine with guile-1.8.  With Ubuntu 14.04's
guile-2.0.9 and latest GIT master

    5ded849 Convert slot allocation to use intsets

I do get output but compilation fails:

    $ guile  ./hash.scm
    ;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
    ;;;       or pass the --no-auto-compile argument to disable.
    ;;; compiling /home/janneke/vc/verum/development/language/asd/./hash.scm
    ;;; WARNING: compilation of /home/janneke/vc/verum/development/language/asd/./hash.scm failed:
    ;;; ERROR: unknown hash-comma tag  hash
    cat

Is this a bug in the documentation, in guile, or ...?

I need to produce a json file from a guile tree that currently
looks like

   ((event0 (state (var .  value) ...) (trace (loc0 loc1 ...))) ... )

contents of the tree are symbols and numbers.  I hacked guile-json to
grok and produce symbols too.  So far so good for lists.  

However, json wants hash maps.  SRFI-10 hash looked like a nice ascii
data exchange format for hash maps.  (I would like to have pretty-print
use that notation too, as an alternative for the opaque

   #<hash-table b87480 0/31>

I get a suspicious feeling that I'm doing something very wrong if no one
else is using this, please enlighten me?

Greetings,
Jan


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(use-modules (srfi srfi-10))

(define-reader-ctor 'hash
       (lambda elems
         (let ((table (make-hash-table)))
           (for-each (lambda (elem)
                       (apply hash-set! table elem))
                     elems)
           table)))

(define (animal->family animal)
  (hash-ref '#,(hash ("tiger" "cat")
                     ("lion"  "cat")
                     ("wolf"  "dog"))
            animal))

(display (animal->family "lion"))
(newline)

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-- 
Jan Nieuwenhuizen <janneke@gnu.org> | GNU LilyPond http://lilypond.org
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