with_collate            Collation Order
with_dir                Working directory
with_envvar             Environment variables
with_libpaths           Library paths
with_locale             Locale settings
with_makevars           Makevars variables
with_options            Options
with_par                Graphics parameters
with_path               PATH environment variable
with_sink               Output redirection
with_temp_libpaths      Library paths
withr                   Execute code in temporarily altered environment
