make list operations polymorphic functions
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@ -7,6 +7,7 @@
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(require (only-in "list.rkt" List ~List))
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(require (only-in "set.rkt" Set ~Set))
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(require (only-in "hash.rkt" Hash ~Hash))
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(require (only-in "prim.rkt" Bool))
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(begin-for-syntax
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(define-splicing-syntax-class iter-clause
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@ -89,7 +90,7 @@
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(values #`(in-set- #,e) #'t)]
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[_
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(type-error #:src e
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#:msg "not an iterable type: " τ)]))
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#:msg "not an iterable type: ~a" τ)]))
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(define-typed-syntax for/fold
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@ -3,12 +3,12 @@
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(provide List
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(for-syntax ~List)
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list
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cons
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first
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rest
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member?
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empty?
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reverse)
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(typed-out [[cons- : (∀ (X) (→fn X (List X) (List X)))] cons]
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[[first- : (∀ (X) (→fn (List X) X))] first]
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[[rest- : (∀ (X) (→fn (List X) (List X)))] rest]
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[[member?- (∀ (X) (→fn X (List X) Bool))] member?]
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[[empty?- (∀ (X) (→fn (List X) Bool))] empty?]
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[[reverse- (∀ (X) (→fn (List X) (List X)))] reverse]))
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(require "core-types.rkt")
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(require (only-in "prim.rkt" Bool))
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@ -26,44 +26,5 @@
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-------------------
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[⊢ (list- e- ...) ⇒ (List (U τ ...))])
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(define-typed-syntax (cons e1 e2) ≫
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[⊢ e1 ≫ e1- ⇒ τ1]
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#:fail-unless (pure? #'e1-) "expression must be pure"
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[⊢ e2 ≫ e2- ⇒ (~List τ2)]
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#:fail-unless (pure? #'e2-) "expression must be pure"
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#:with τ-l (type-eval #'(List (U τ1 τ2)))
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----------------------------------------
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[⊢ (cons- e1- e2-) ⇒ τ-l])
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(define-typed-syntax (empty? e) ≫
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[⊢ e ≫ e- ⇒ (~List _)]
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#:fail-unless (pure? #'e-) "expression must be pure"
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-----------------------
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[⊢ (empty?- e-) ⇒ Bool])
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(define-typed-syntax (first e) ≫
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[⊢ e ≫ e- ⇒ (~List τ)]
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#:fail-unless (pure? #'e-) "expression must be pure"
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-----------------------
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[⊢ (first- e-) ⇒ τ])
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(define-typed-syntax (rest e) ≫
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[⊢ e ≫ e- ⇒ (~List τ)]
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#:fail-unless (pure? #'e-) "expression must be pure"
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-----------------------
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[⊢ (rest- e-) ⇒ (List τ)])
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(define-typed-syntax (member? e l) ≫
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[⊢ e ≫ e- ⇒ τe]
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#:fail-unless (pure? #'e-) "expression must be pure"
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[⊢ l ≫ l- ⇒ (~List τl)]
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#:fail-unless (pure? #'l-) "expression must be pure"
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#:fail-unless (<: #'τe #'τl) "incompatible list"
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----------------------------------------
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[⊢ (member?- e- l-) ⇒ Bool])
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(define- (member?- v l)
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(and- (member- v l) #t))
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(require/typed racket/base
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[reverse : (∀ (X) (→fn (List X) (List X)))])
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@ -57,7 +57,8 @@
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: (List (Tuple Int Int))
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⇒ (list (tuple 1 4) (tuple 2 5) (tuple 3 6)))
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(define (zip-even [xs : (List Int)]
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;; binding in #:when isn't handled
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#;(define (zip-even [xs : (List Int)]
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[ys : (List Int)])
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((inst reverse (Tuple Int Int))
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(for/fold ([acc : (List (Tuple Int Int))
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