rlang 0.4.9

Breaking changes

• Dropped support for the R 3.2 series.

New features

• inject() evaluates its argument with !!, !!!, and {{
  support.

• New enquo0() and enquos0() operators for defusing function
  arguments without automatic injection (unquotation).

• format_error_bullets() is no longer experimental. The message
  arguments of abort(), warn(), and inform() are automatically
  passed to that function to make it easy to create messages with
  regular, info, and error bullets. See ?format_error_bullets for
  more information.

• New zap_srcref() function to recursively remove source references
  from functions and calls.

• A new compat file for the zeallot operator %<-% is now available
  in the rlang repository.

• New %<~% operator to define a variable lazily.

• New env_browse() and env_is_browsed() functions. env_browse()
  is equivalent to evaluating browser() within an environment. It
  sets the environment to be persistently browsable (or unsets it if
  value = FALSE is supplied).

• Functions created from quosures with as_function() now print in a
  more user friendly way.

• New rlang_print_backtrace C callable for debugging from C
  interpreters (#1059).

Bugfixes and improvements

• The .data pronoun no longer skips functions (#1061). This solves a
  dplyr issue involving rowwise data frames and list-columns of
  functions (tidyverse/dplyr#5608).

• as_data_mask() now intialises environments of the correct size to
  improve efficiency (#1048).

• eval_bare(), eval_tidy() (#961), and with_handlers() (#518)
  now propagate visibility.

• cnd_signal() now ignores NULL inputs.

• Fixed bug that prevented splicing a named empty vector with the
  !!! operator (#1045).

• The exit status of is now preserved in non-interactive sessions when
  entrace() is used as an options(error = ) handler (#1052,
  rstudio/bookdown#920).

• next and break are now properly deparsed as nullary operators.