segfault with POSIXlt zone=NULL zone=""

Hi all,

I ran into a segfault while playing with dates.

    $ R --no-init-file
    ...
    > library(lubridate); d=as.POSIXlt(floor_date(Sys.time(),"year")); d$zone=NULL; d$zone=""; d

If you're asking about a bug in R, you should provide a *minimal*
reproducible example (i.e. one without any package dependencies).
This has nothing to do with lubridate, so you can reproduce the
behavior with:

d <- as.POSIXlt(Sys.time())
d$zone <- NULL
d$zone <- ""
d
    Attaching package: ?lubridate?

    The following object is masked from ?package:base?:

        date

    Warning message:
    package ?lubridate? was built under R version 3.4.0

     *** caught segfault ***
    address (nil), cause 'unknown'

    Traceback:
     1: format.POSIXlt(x, usetz = TRUE)
     2: format(x, usetz = TRUE)
     3: print(format(x, usetz = TRUE), ...)
     4: print.POSIXlt(x)
     5: function (x, ...) UseMethod("print")(x)

    Possible actions:
    ...

Hope I'm not doing something illegal...

You are.  You're changing the internal structure of a POSIXlt object
by re-ordering the list elements.  You should not expect a malformed
POSIXlt object to behave as if it's correctly formed.  You can see
it's malformed by comparing it's unclass()'d output.

d <- as.POSIXlt(Sys.time())
unclass(d)  # valid POSIXlt object
d$zone <- NULL
d$zone <- ""
unclass(d)  # your malformed POSIXlt object
Thanks,

Frederick

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segfault with POSIXlt zone=NULL zone=""

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