[procedure] option names required-arg? optional-arg? option-proc

SRFI-37: Creates an option structure used by args-fold. Names is a list of short (character) and long (string) option names. Required-arg? specifies if this options requires an option-argument (boolean). Optional-arg? specifies if this option can accept an option-argument (boolean). Option-proc is a procedure used to process this option.

Accessors of this structures are: option-names, option-required-arg?, option-optional-arg? and option-processor.