[plt-scheme] Simple scheme idiom?

On Sep 15, czhu at cs.utah.edu wrote:
> Seems that something is wrong with you DrScheme. #?# where ? should
> be an exact nonnegtive interger, is used to print sharing in
> data. In this case, there is no sharing. On my DrScheme, I tried you
> program, and it works fine (give the same output as mzscheme).

"#?#" is how Swindle stops printout in levels that are dipper than
`*print-level*'.

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