Examples in dev version keep giving errors

[hongooi73]

I've installed the dev version of fabletools to work on implementing #169 #170, but I'm running into lots of errors when trying to run the examples for forecast. Here is one:

r$> library(fable)
    library(tsibble)
    library(tsibbledata)
    library(dplyr)
    library(tidyr)

    # Forecasting with an ETS(M,Ad,A) model to Australian beer production
    beer_fc <- aus_production %>%
      model(ets = ETS(log(Beer) ~ error("M") + trend("Ad") + season("A"))) %>%       
      forecast(h = "3 years")

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

Error: `mutate()` argument `ets` errored.
i `ets` is `(function (object, ...) ...`.
x non-numeric argument to mathematical function
Run `rlang::last_error()` to see where the error occurred.
In addition: Warning message:
`time_unit()` is deprecated as of tsibble 0.9.0.
Please use `default_time_units()` instead.
This warning is displayed once every 8 hours.
Call `lifecycle::last_warnings()` to see where this warning was generated. 

Is this expected? I have dev versions of all the tidyverts packages installed, as well as dplyr, vctrs and tibble.

Session info:

r$> sessionInfo()
R version 3.6.2 (2019-12-12)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 18363)

Matrix products: default

locale:
[1] LC_COLLATE=English_Australia.1252  LC_CTYPE=English_Australia.1252
[3] LC_MONETARY=English_Australia.1252 LC_NUMERIC=C
[5] LC_TIME=English_Australia.1252

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

other attached packages:
[1] tidyr_1.0.2            dplyr_0.8.99.9000      tsibbledata_0.1.0.9000
[4] tsibble_0.8.9.9000     fable_0.1.2.9000       fabletools_0.1.2.9000

loaded via a namespace (and not attached):
 [1] Rcpp_1.0.3                magrittr_1.5              munsell_0.5.0
 [4] tidyselect_1.0.0          colorspace_1.4-0          anytime_0.3.7
 [7] R6_2.4.1                  rlang_0.4.5               fansi_0.4.0
[10] stringr_1.4.0             tools_3.6.2               grid_3.6.2
[13] gtable_0.2.0              cli_2.0.0                 ellipsis_0.3.0
[16] assertthat_0.2.1          lazyeval_0.2.1            tibble_2.99.99.9014
[19] lifecycle_0.2.0           crayon_1.3.4              purrr_0.3.3
[22] ggplot2_3.2.1             vctrs_0.2.99.9010         glue_1.3.2
[25] stringi_1.4.3             compiler_3.6.2            pillar_1.4.3
[28] scales_1.0.0              generics_0.0.2            distributional_0.0.0.9000   
[31] lubridate_1.7.4           pkgconfig_2.0.3

[mitchelloharawild]

The development versions are in flux at the moment while I add varying levels of support for vctrs in preparation for upcoming tibble and dplyr releases. The master branch should currently be suitable for dev tibble and CRAN dplyr.