31 lines
1.2 KiB
Racket
31 lines
1.2 KiB
Racket
#lang racket/base
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(require "pattern.rkt")
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(require rackunit)
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(struct a (x) #:prefab)
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(struct b (x) #:transparent)
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(define (intersect-or-void a b) (intersect a b values void))
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(check-equal? (intersect-or-void ? ?) ?)
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(check-equal? (intersect-or-void 'a ?) 'a)
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(check-equal? (intersect-or-void 123 ?) 123)
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(check-equal? (intersect-or-void (cons ? 2) (cons 1 ?)) (cons 1 2))
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(check-equal? (intersect-or-void (cons 1 2) ?) (cons 1 2))
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(check-equal? (intersect-or-void 1 2) (void))
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(check-equal? (intersect-or-void (cons 1 2) (cons ? 2)) (cons 1 2))
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(check-equal? (intersect-or-void (cons 1 2) (cons 3 2)) (void))
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(check-equal? (intersect-or-void (cons 1 2) (cons 1 3)) (void))
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(check-equal? (intersect-or-void (vector 1 2) (vector 1 2)) (vector 1 2))
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(check-equal? (intersect-or-void (vector 1 2) (vector 1 2 3)) (void))
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(check-equal? (intersect-or-void (a 'a) (a 'b)) (void))
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(check-equal? (intersect-or-void (a 'a) (a 'a)) (a 'a))
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(check-equal? (intersect-or-void (a 'a) (a ?)) (a 'a))
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(check-equal? (intersect-or-void (a 'a) ?) (a 'a))
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(check-equal? (intersect-or-void (b 'a) (b 'b)) (void))
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(check-equal? (intersect-or-void (b 'a) (b 'a)) (b 'a))
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(check-equal? (intersect-or-void (b 'a) (b ?)) (b 'a))
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(check-equal? (intersect-or-void (b 'a) ?) (b 'a))
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