R-alpha: R 0.50.a3 minor remark

[Kurt Hornik]

Just a minor remark.  We now have

> args(ls)
function (name, pos = -1, envir = pos.to.env(pos), all.names = FALSE, 
        pattern) 

but

> pos.to.env(-1)
Error in pos.to.env(-1) : invalid argument

whereas

> pos.to.env(length(search()))
NULL


Perhaps pos.to.env should really return the corresponding environments,
just for sake of completeness ... or the fun of it.

-k
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