===================================== regular ===================================== snake_case camelCase az_AZ_19 bang! question? doctest not1 notfalse --- (source (identifier) (identifier) (identifier) (identifier) (identifier) (identifier) (identifier) (identifier)) ===================================== unused ===================================== _ _number __TEST__ --- (source (unused_identifier) (unused_identifier) (unused_identifier)) ===================================== three dots identifier ===================================== ... --- (source (identifier)) ===================================== special identifier ===================================== __MODULE__ __DIR__ --- (source (special_identifier) (special_identifier))