Segfault with unmatched quote, if there are no column names

[jennybc]

This segfaults:

vroom::vroom(
  I('field1,"unmatched,field3\n'),
  delim = ",",
  col_names = FALSE,
  show_col_types = FALSE
)

Now, it is a malformed input, but it shouldn't segfault.

The correction is to provide a quote value that is consistent with the input, e.g.:

vroom::vroom(
  I('field1,"unmatched,field3\n'),
  delim = ",",
  quote = "",
  col_names = FALSE,
  show_col_types = FALSE
)
#> # A tibble: 1 × 3
#>   X1     X2            X3    
#>   <chr>  <chr>         <chr> 
#> 1 field1 "\"unmatched" field3

^{Created on 2026-06-10 with reprex v2.1.1}

[jennybc]

Note that all is well if there are column names. It's the lack that's problematic. In the presence of column names, we correctly surface the parsing problem.

vroom::vroom(
  I('X1,X2,X3\nfield1,"unmatched,field3\n'),
  delim = ",",
  show_col_types = FALSE
)
#> Warning: One or more parsing issues, call `problems()` on your data frame for details,
#> e.g.:
#>   dat <- vroom(...)
#>   problems(dat)
#> # A tibble: 1 × 3
#>   X1     X2                   X3   
#>   <chr>  <chr>                <lgl>
#> 1 field1 "unmatched,field3\n" NA

^{Created on 2026-06-10 with reprex v2.1.1}