Alex Shinn scripsit:
Not too many outside R6RS, actually: only RScheme, SXM, SigScheme, UMB,
> There are actually many implementations for which this is an error.
> Notably R6RS requires it to be an error.
Dfsch, Foment, Chibi.
This is only available (at least at the REPL) in Racket, Chicken, SISC,
> Schemes typically use the name `add1' for this.
Sizzle, Vicare, IronScheme, RScheme, SXM.
See <http://trac.sacrideo.us/wg/wiki/PlusOneEx> for details.
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