read_csv("a,bn1,2,3,4")
#> Warning: 1 parsing failure.
#> row # A tibble: 1 x 5 col     row   col  expected    actual         file expected   <int> <chr>     <chr>     <chr>        <chr> actual 1     1  <NA> 2 columns 4 columns literal data file # A tibble: 1 x 5
#>
#> # A tibble: 1 x 2
#>       a     b
#>   <int> <int>
#> 1     1     2
#> Warning message:
#> In rbind(names(probs), probs_f) :
#>   number of columns of result is not a multiple of vector length (arg 2)