Re: [racket] illegal placeholder cycle

2011-09-10 Thread Doug Orleans
On Sat, Sep 10, 2011 at 5:16 PM, Matthew Flatt wrote: > At Tue, 6 Sep 2011 16:21:57 -0400, Doug Orleans wrote: >> This error message is surprising: >> >> > (shared ((c (append null c))) c) >> make-reader-graph: illegal placeholder cycle in value: '(#) >> >> Is it unreasonable to expect this to eva

Re: [racket] illegal placeholder cycle

2011-09-10 Thread Matthew Flatt
At Tue, 6 Sep 2011 16:21:57 -0400, Doug Orleans wrote: > This error message is surprising: > > > (shared ((c (append null c))) c) > make-reader-graph: illegal placeholder cycle in value: '(#) > > Is it unreasonable to expect this to evaluate to null? I don't see how to get `null', although I cou

[racket] illegal placeholder cycle

2011-09-06 Thread Doug Orleans
This error message is surprising: > (shared ((c (append null c))) c) make-reader-graph: illegal placeholder cycle in value: '(#) Is it unreasonable to expect this to evaluate to null? --Doug _ For list-related administrative tasks: http://lists