[Rd] demo(is.things) fails (PR#772)

[B.Rowlingson@lancaster.ac.uk]

Full_Name: Barry Rowlingson
Version: R-1.2.0
OS: RH7/i386
Submission from: (NULL) (148.88.0.11)


demo(is.things) fails with:

> is.ALL(NULL)
Error in as.POSIXct.default(x) : Don't know how to convert `x' to class
"POSIXct"
In addition: Warning message: 
is.nan() applied to non-(list or vector) in: fn(obj) 

 - this seems to be because it is calling:

> is.na.POSIXlt(NULL)
Error in as.POSIXct.default(x) : Don't know how to convert `x' to class
"POSIXct"

 is.na.POSIXlt(NA) gives the same error, and there's nothing on NA's or
NULL's in the documentation for the POSIX{l,c}t functions. It seems that
errors in these functions cause 'stop()' calls rather than returning NA's.

Barry



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