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MzScheme provides boxes, records with a single mutable
field:
- (box v) returns a new box that contains v.
- (unbox box) returns the content of box. For any
v, (unbox (box v)) returns v.
- (set-box! box v) sets the content of box to
v.
- (box? v) returns #t if v is a box, #f
otherwise.
Two boxes are equal? if the contents of the boxes are
equal?.
PLT