assert	assert
error	error
error_if	error_if
has_names	has_names
info	info
info_if	info_if
is_dir	is_dir
is_file	is_file
is_in	is_in
is_na	is_na
is_readable	is_readable
is_url	is_url
is_writeable	is_writeable
msgr	msgr
try_catch	try_catch
try_map	try_map
try_pmap	try_pmap
warn	warn
warn_if	warn_if
