Marc:

In my array code I do lots of things like:

(define (Interval-dimension interval) (or (and (not (Interval? interval)) (error "Interval-dimension: argument is not an interval: " interval)) (##Interval-dimension interval)))

If I make a mistake and pass a large object that is not an Interval (like an array with a few million elements in it) to Interval- dimension, the code in _repl.scm writes out the whole argument to error and I have to try to hit ^C really, really fast before the location of the error scrolls off the screen.

I think it would be better to change the code for (##display- exception exc port) in _repl.scm to something like

((macro-error-exception? exc) (##display (macro-error-exception-message exc) port) (##for-each (lambda (arg) (##newline port) (##write arg port ##error-arg-write-width)) (macro-error-exception-parameters exc)) (##newline port))

and define

(define ##error-arg-write-width 72)

(set! ##error-arg-write-width ##error-arg-write-width)

outside that function. Now I get nice error messages like

(set! ##error-arg-write-width 120) (load "convex2.scm")

*** ERROR IN build-Array, "../generic-arrays.scm"@472.5 -- build- Array: accessor is not a procedure: #<Array-base #4 domain: #<Interval #5 lower-bounds: #(0 0) upper- bounds: #(256 256)> accessor: #<procedure #6> setter: #

and I can work with this ;-).

Brad