[racket-dev] make-evaluator fails for honu

I'm trying to evaluate honu programs inside a sandbox but I get an error from `make-evaluator'. Other languages work (racket/base, typed/racket), its only 'honu that fails so I must have set up something incorrectly. Any idea what it could be?

current-directory: `exists' access denied for /home/jon/tmp/

 === context ===
/home/jon/bin/plt/collects/setup/private/main-collects.rkt:19:4: find-main-collects
/home/jon/bin/plt/collects/racket/private/promise.rkt:103:10
/home/jon/bin/plt/collects/racket/private/more-scheme.rkt:268:2: call-with-exception-handler
...

>From this code

#lang at-exp racket/base

(require racket/sandbox)

(define (test input)
  (define honu-eval (make-evaluator 'honu))
  (honu-eval input))

(define input string-append)

(test @input{1})