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#lang racket
(require (except-in rackunit check))
(require "../stlc-pred.rkt")
(define-test-suite landins-knot
(check-exn
exn:fail?
(λ () (infer '
(let (id : (Nat → 0 Nat)) (λ x x)
(let (r : (Ref (Nat → 0 Nat))) (new id)
(let (f : (Nat → 1 Nat)) (λ x ((! r) x))
(set r f
(f 0))))))))
(check-eq?
(infer '
(let (id : (Nat → 0 Nat)) (λ x x)
(let (r : (Ref (Nat → 0 Nat))) (new id)
(let (f : (Nat → 1 Nat)) (λ x ((! r) x))
(f 0)))))
'Nat)
(check-true
(check '
(let (id : (Nat → 0 Nat)) (λ x x)
(let (r : (Ref (Nat → 0 Nat))) (new id)
(let (f : (Nat → 1 Nat)) (λ x ((! r) x))
(f 0))))
'Nat)))
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