c4f0f723f5
elim now runs. Parts of the stdlib have been converted to use elim, but it's complicated to program with. Need to implement case and fix in terms of elim, I think.
21 lines
504 B
Racket
21 lines
504 B
Racket
#lang s-exp "../redex-curnel.rkt"
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(provide bool btrue bfalse if bnot)
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(data bool : Type
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(btrue : bool)
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(bfalse : bool))
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(define-syntax (if syn)
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(syntax-case syn ()
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[(_ t s f)
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;; Compute the motive
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(let ([M #`(lambda (x : #,(type-infer/syn #'t))
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#,(type-infer/syn #'s))])
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#`(elim bool t #,M s f))]))
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(define (bnot (x : bool)) (if x bfalse btrue))
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(module+ test
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(require rackunit)
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(check-equal? (bnot btrue) bfalse)
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(check-equal? (bnot bfalse) btrue))
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