[Chicken-users] problems with datatype and eopl 3-5

[Ulrich Vollert]

Hello,

while reading "Essentials of Programming Languages" 
(http://www.cs.indiana.edu/eopl/), I am learning Scheme and exercising 
with Chicken (thanks to Felix ;-))

While using datatype.egg and the source code from the book (see the URL 
above), I get an error with the examples from chapter 3.5. I did

  (load "r5rs.scm")

  (load "sllgen.scm")

  (require-for-syntax 'datatype)

  (load "test-harness.scm")

  (load "test-suite.scm")

  (load "3-5.scm")

  (run-all)

  Error: bad argument type to `cases'


Why?

When using syntax-case.egg and

  (for-each load

    '("r5rs.scm" "sllgen.scm" "define-datatype.scm"

       "test-harness.scm" "test-suite.scm"))

  (load "3-5.scm")

  (run-all)

everything is fine.

I found out that scan&parse of 3-5.scm produces a result, but seems to 
answer a different type as with the define-datatype.scm...???

Secondly, I was surprised about a performance comparison between chicken 
and scheme48 when trying out the above commands on my desktop:

(run-all) needs 3.187 seconds in csi, but only 0.28 seconds in scheme48 
- which is a factor of 11.

Even worse is this comparison on my tiny, but slow PDA Sharp Zaurus C860 
(from www.trisoft.de) which is running under Linux and where I compiled 
succesfully Chicken and Scheme48:

(run-all) takes 114.42 seconds in csi, but only 5.7 seconds in scheme48 
- which is a factor of 20.

Any explanation for this?

Kindly regards,
Ulrich