Error: use of NULL environment is defunct

[hsbadr]

After #1176, I get the following error:

Error in env_get(env, ".rlang_use_cli_format", default = default, inherit = TRUE,  :
  use of NULL environment is defunct

Here's an example:

vroom::vroom("https://raw.githubusercontent.com/CSSEGISandData/COVID-19/master/csse_covid_19_data/csse_covid_19_daily_reports/01-14-2021.csv", altrep = FALSE)

Note that reading this file with altrep = TRUE or using utils::read.csv() (or any other reader that doesn't depend on rlang) is ok. Moreover, other conditions can trigger the same error, such as setting .default in col_types with specific files. None of this happens with the CRAN version of rlang.

This is traced back as follows:

6: env_get(env, ".rlang_use_cli_format", default = default, inherit = TRUE,
       last = last) at cnd-message.R#263
5: use_cli_format(env) at cnd-message.R#230
4: cli_format_warning(message, caller_env()) at cnd-signal.R#110
3: (function (message = NULL, class = NULL, ..., .frequency = c("always",
       "regularly", "once"), .frequency_id = NULL, .subclass = deprecated())
   {
       validate_signal_args(.subclass)
       message <- validate_signal_message(message, class)
       message <- cli_format_warning(message, caller_env())
       .frequency <- arg_match0(.frequency, c("always", "regularly",
           "once"))
       if (needs_signal(.frequency, .frequency_id, warning_freq_env,
           "rlib_warning_verbosity")) {
           message <- add_message_freq(message, .frequency, "warning")
       }
       else {
           return(invisible(NULL))
       }
       cnd <- warning_cnd(class, ..., message = message)
       warning(cnd)
   })("One or more parsing issues, see `problems()` for details",
       "vroom_parse_issue") at cpp11.R#56
2: vroom_(file, delim = delim %||% col_types$delim, col_names = col_names,
       col_types = col_types, id = id, skip = skip, col_select = col_select,
       name_repair = .name_repair, na = na, quote = quote, trim_ws = trim_ws,
       escape_double = escape_double, escape_backslash = escape_backslash,
       comment = comment, locale = locale, guess_max = guess_max,
       n_max = n_max, altrep = vroom_altrep(altrep), num_threads = num_threads,
       progress = progress) at vroom.R#152
1: vroom::vroom("https://raw.githubusercontent.com/CSSEGISandData/COVID-19/master/csse_covid_19_data/csse_covid_19_daily_reports/01-14-2021.csv",
       altrep = FALSE)

[lionel-]

Unfortunately I can't reproduce this. Do you see the issue in other situations?

[hsbadr]

This happens under R-devel with packages installed from GitHub. It seems that the problem is in the use of caller_env() in the internal cli_format_warning function, if somehow env is empty:

> rlang:::cli_format_warning("Hi", rlang::empty_env())
Error in env_get(env, ".rlang_use_cli_format", default = default, inherit = TRUE,  :
  use of NULL environment is defunct

[hsbadr]

This is traced back to:

> rlang:::use_cli_format(rlang::empty_env())
Error in env_get(env, ".rlang_use_cli_format", default = default, inherit = TRUE,  :
  use of NULL environment is defunct

[lionel-]

Ah perhaps I needed dev vroom to reproduce? Either way I can reproduce your minimal reprex with rlang:::use_cli_format(), thanks! On both r-release and r-devel.

[hsbadr]

Thanks @lionel- ! I don't know exactly why the caller_env() is empty, which is the culprit here, but can you catch it in cli_format_warning, use_cli_format or env_get? I don't run into this issue on R-release.

[hsbadr]

Ah perhaps I needed dev vroom to reproduce?

Yes, I've just reproduced this issue with the dev version of both vroom and rlang on R-release too.