> filepath <- system.file("", "ex-convo.yml", package = "convo")
> convo <- read_convo(filepath)
> write_pb(convo, c("IND_A", "AMT_B"), filename = "convo-validation.yml", path = tempdir())
 Error in if (step_list$column[[1]] == step_list$columns_expr) { : 
  missing value where TRUE/FALSE needed 
7.
get_column_text(step_list = step_list, expanded = expanded) 
6.
as_agent_yaml_list(agent = agent, expanded = expanded) 
5.
pointblank::yaml_write(., filename = "convo-validation.yml", 
    path = "/var/folders/bp/l5qt50g13sndlz0x48jqqv300000gn/T//RtmpqDnAMJ") 
4.
pointblank::create_agent(read_fn = ~setNames(as.data.frame(matrix(1, 
    ncol = 2)), c("IND_A", "AMT_B"))) %>% pointblank::col_vals_not_null(matches("^([A-Za-z]_){0}ID"), 
    step_id = 1) %>% pointblank::col_is_numeric(matches("^([A-Za-z]_){0}ID"), 
    step_id = 2) %>% pointblank::col_vals_between(matches("^([A-Za-z]_){0}ID"),  ... at <text>#1
3.
eval(parse(text = code)) 
2.
eval(parse(text = code)) 
1.
write_pb(convo, c("IND_A", "AMT_B"), filename = "convo-validation.yml", 
    path = tempdir()) 

> pointblank::interrogate(agent)

── Interrogation Started - there are 13 steps ───────────────────────────────────────────────────────────────
Error: Only strings can be converted to symbols
Run `rlang::last_error()` to see where the error occurred.
> rlang::last_error()
<error/rlang_error>
Only strings can be converted to symbols
Backtrace:
 1. pointblank::interrogate(agent)
 2. pointblank:::check_table_with_assertion(...)
 3. pointblank:::interrogate_not_null(agent = agent, idx = idx, table = table)
 4. pointblank:::get_column_as_sym_at_idx(agent = agent, idx = idx)
 5. rlang::sym(...)

#> Level 1
#> - 
#> Level 2
#> -

#> # A tibble: 0 x 29
#> # … with 29 variables: i <int>, step_id <chr>, sha1 <chr>,
#> #   assertion_type <chr>, column <list>, values <list>, na_pass <lgl>,
#> #   preconditions <list>, actions <list>, label <chr>, brief <chr>,
#> #   active <list>, eval_active <lgl>, eval_error <lgl>, eval_warning <lgl>,
#> #   capture_stack <list>, all_passed <lgl>, n <int>, n_passed <int>,
#> #   n_failed <int>, f_passed <dbl>, f_failed <dbl>, warn <lgl>, notify <lgl>,
#> #   stop <lgl>, row_sample <dbl>, tbl_checked <list>, time_processed <dttm>,
#> #   proc_duration_s <dbl>