option[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.
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