Running examples in 'ruler-Ex.R' failed
The error most likely occurred in:

> ### Name: cell-pack
> ### Title: Cell rule pack
> ### Aliases: cell-pack
> 
> ### ** Examples
> 
> cell_outlier_rules <- . %>% dplyr::transmute_at(
+   c("disp", "qsec"),
+   rules(z_score = abs(. - mean(.)) / sd(.) > 1)
+ )
> 
> cell_packs(outlier = cell_outlier_rules)
$outlier
A Cell rule pack:
Functional sequence with the following components:

 1. dplyr::transmute_at(., c("disp", "qsec"), rules(z_score = abs(. -     mean(.))/sd(.) > 1))

Use 'functions' to extract the individual functions. 

> 
> # Dealing with one column edge case
> improper_pack <- . %>% dplyr::transmute_at(
+   dplyr::vars(vs),
+   rules(improper_is_neg = . < 0)
+ )
> 
> proper_pack <- . %>% dplyr::transmute_at(
+   dplyr::vars(vs = vs),
+   rules(proper_is_neg = . < 0)
+ )
> 
> mtcars[1:2, ] %>%
+   expose(cell_packs(improper_pack, proper_pack)) %>%
+   get_report()
Error in namespaceExport(ns, exports) : 
  undefined exports: %s!=%, %s!==%, %s+%, %s<%, %s<=%, %s==%, %s===%, %s>%, %s>=%, %stri!=%, %stri!==%, %stri+%, %stri<%, %stri<=%, %stri==%, %stri===%, %stri>%, %stri>=%, stri_datetime_add<-, stri_sub<-, stri_subset<-, stri_subset_charclass<-, stri_subset_coll<-, stri_subset_fixed<-, stri_subset_regex<-, stri_c, stri_c_list, stri_cmp, stri_cmp_eq, stri_cmp_equiv, stri_cmp_ge, stri_cmp_gt, stri_cmp_le, stri_cmp_lt, stri_cmp_neq, stri_cmp_nequiv, stri_compare, stri_conv, stri_count, stri_count_boundaries, stri_count_charclass, stri_count_coll, stri_count_fixed, stri_count_regex, stri_count_words, stri_datetime_add, stri_datetime_create, stri_datetime_fields, stri_datetime_format, stri_datetime_fstr, stri_datetime_now, stri_datetime_parse, stri_datetime_symbols, stri_detect, stri_detect_charclass, stri_detect_coll, stri_detect_fixed, stri_detect_regex, stri_dup, stri_duplicated, stri_duplicated_any, stri_enc_detect, stri_enc_detect2, stri_enc_fromutf32, stri_enc_get, stri_enc_inf
Calls: %>% ... tryCatch -> tryCatchList -> tryCatchOne -> <Anonymous>
Execution halted