error in using %m+% when NA involved and rollback required

[zhangkd5]

When using %m+% function to add months to a date-time vector I noticed in a special situation where the date-time object includes both NA and month-end dates that require rollback, an error will occur:

> ymd(c('20150131')) %m+% months(1)  # OK when no NA
[1] "2015-02-28"
> ymd(c('2015-01-31', NA)) %m+% months(2)  # OK when no rollback
[1] "2015-03-31" NA  
> ymd(c('20150131', NA)) %m+% months(1) # Error when combining the two
Error in NextMethod(.Generic) : 
  NAs are not allowed in subscripted assignments

> sessionInfo()
R version 3.3.1 (2016-06-21)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows >= 8 x64 (build 9200)

locale:
[1] LC_COLLATE=English_United States.1252 
[2] LC_CTYPE=English_United States.1252   
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C                          
[5] LC_TIME=English_United States.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods  
[7] base     

other attached packages:
[1] lubridate_1.5.6

loaded via a namespace (and not attached):
[1] magrittr_1.5  tools_3.3.1   stringi_1.1.1 stringr_1.0.0

[vspinu]

Thanks. I will address it asap.