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@ -31,8 +31,8 @@
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(define #'(define-datatype <base-type> <base-type-predicate?>
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(<subtype> [<field> <field-predicate?>] ...) ...)
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#'(begin
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(struct <base-type> () #:transparent)
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(struct <subtype> <base-type> (<field> ...) #:transparent
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(struct <base-type> () #:transparent #:mutable)
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(struct <subtype> <base-type> (<field> ...) #:transparent #:mutable
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#:guard (λ(<field> ... name)
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(unless (<field-predicate?> <field>)
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(error name (format "arg ~a is not ~a" <field> '<field-predicate?>))) ...
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