Using `exclude:` in `.lintr` results in error

[jabenninghoff]

When using the 3.0.0 CRAN release of lintr, listing with the following .lintr file results in an unexpected error:

linters: linters_with_defaults(
    line_length_linter(100) 
  )
exclude: list(
    "bad.R" = list(
      1, # global exclusions are unnamed
      line_length_linter = 4:6
    )
  )

(adapted from the Get Started page)

Error message when running lint_dir():

$ Rscript -e 'lintr::lint_dir(".")'
Error in `[.data.frame`(rex::re_matches(lines, exclude, locations = TRUE),  : 
  undefined columns selected
Calls: <Anonymous> ... do.call -> <Anonymous> -> lapply -> FUN -> [ -> [.data.frame
Execution halted

To reproduce: run Rscript -e 'lintr::lint_dir(".")' from a directory containing the .lintr file above, and the following bad.R:

tmp = "value"

# regular comment
# really long comment ............................................................................................................
# really long comment ............................................................................................................
# really long comment ............................................................................................................
# regular comment

[AshesITR]

Hi @jabenninghoff. You're looking for exclusions: list(...).
exclude: ... modifies the regex used for the in-file exclusion syntax.

[AshesITR]

Sorry for the premature closure - thanks for reporting this bug in the documentation!