Thomas Lumley wrote: > On Tue, 24 Mar 2009, Wacek Kusnierczyk wrote: > >> thanks. so it seems to be intentionally parsable, though i wouldn't say >> that this gives a meaning to ':=' -- the operator has a syntactic >> category, but no semantics. the syntactic category does not imply any >> semantics, as in >> >> '<-' = function(a, b) NULL >> 1 <- a >> # NULL >> >> where '<-' is still parsed the original way (as a LEFT_ASSIGN, gram.y >> again), but has now a completely different semantics. >> >> it looks like a bug to me: ':=' is parsed on par with '<-' as a >> LEFT_ASSIGN, but apparently is not backed by any function. it's a >> zombie. (unless rvalues is used, that is.) > > yes, it's a zombie. It used to assign to the R system environment > rather than the global workspace (roughly what is the base namespace > now). >
thanks for the explanation. for the sake of rvalues, please do not fix this bug. i find it useful to avoid messing with = and <-. vQ ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
