Alex Shinn scripsit:

> There are actually many implementations for which this is an error.
> Notably R6RS requires it to be an error.

Not too many outside R6RS, actually: only RScheme, SXM, SigScheme, UMB,
Dfsch, Foment, Chibi.

> Schemes typically use the name `add1' for this.

This is only available (at least at the REPL) in Racket, Chicken, SISC,
Sizzle, Vicare, IronScheme, RScheme, SXM.

See <http://trac.sacrideo.us/wg/wiki/PlusOneEx> for details.

--
John Cowan          http://www.ccil.org/~cowan        cowan@ccil.org
Deshil Holles eamus.  Deshil Holles eamus.  Deshil Holles eamus.
Send us, bright one, light one, Horhorn, quickening, and wombfruit. (3x)
Hoopsa, boyaboy, hoopsa!  Hoopsa, boyaboy, hoopsa!  Hoopsa, boyaboy, hoopsa!
  --Joyce, Ulysses, "Oxen of the Sun"

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