486 lines
13 KiB
Racket
486 lines
13 KiB
Racket
#lang racket
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(require rackunit
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syntax/parse
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syntax/parse/debug
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"setup.rkt"
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(for-syntax syntax/parse))
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;; Main syntax class and pattern tests
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;; ========
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(define-syntax-class one
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(pattern (a)))
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(define-syntax-class two
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(pattern (a b)))
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;; ========
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;; -- S patterns
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;; name patterns
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(tok 1 a
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(and (bound (a 0)) (s= a 1)))
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(tok (a b c) a
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(and (bound (a 0)) (s= a '(a b c))))
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(tok 1 a
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'ok
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#:pre [] #:post [1])
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;; wildcard patterns
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(tok 1 _)
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(tok (a b c) _)
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(tok (a b) (_ _)) ;; multiple _'s allowed
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;; sc tests -> lib tests
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(tok (1) x:one
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(and (bound (x 0) (x.a 0)) (s= x '(1)) (s= x.a 1)))
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(tok (1 2) x:two
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(and (bound (x 0) (x.a 0) (x.b 0)) (s= x '(1 2)) (s= x.a 1) (s= x.b 2)))
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(tok (1 2) x:two
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'ok
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#:pre [x:one] #:post [])
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(tok (1) x:one
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'ok
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#:pre [()] #:post [x:two])
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;; check if wildcard, no attr bound
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(terx (1) _:two "expected two")
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;(terx (1 2) _:one "expected one")
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(terx (1 (2 3)) (_:one _:two) "expected one")
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(terx ((1) 2) (_:one _:two) "expected two")
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;; datum patterns
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(tok 1 1
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'ok)
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(tok 1 _
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#t
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#:pre [2] #:post [])
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(tok "here" "here"
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'ok
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#:pre ["there"] #:post [])
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(tok #f #f
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'ok
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#:pre [#t 0] #:post [_])
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(terx 1 2 "literal 2")
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(terx (1 2) 1 "literal 1")
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(terx (1 2) (1 1) "literal 1")
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;; literal patterns
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(test-case "literals: +"
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(syntax-parse #'+ #:literals (+ -)
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[+ (void)]))
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(test-case "literals: - +"
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(syntax-parse #'+ #:literals (+ -)
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[- (error 'wrong)]
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[+ (void)]))
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(test-case "literals: + _"
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(syntax-parse #'+ #:literals (+ -)
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[+ (void)]
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[_ (error 'wrong)]))
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(test-case "datum literals"
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(syntax-parse #'one #:datum-literals (one)
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[one (void)]))
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(test-case "datum literals (not id=?)"
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(let ([one 1])
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(syntax-parse (let ([one 2]) #'one) #:datum-literals (one)
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[one (void)])))
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;; compound patterns
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(tok (a b c) (x y z)
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(and (bound (x 0) (y 0) (z 0)) (s= x 'a) (s= y 'b))
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#:pre [(x y)] #:post [])
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(tok (a . b) (x . y)
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(and (bound (x 0) (y 0)) (s= x 'a) (s= y 'b))
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#:pre [(x y)] #:post [])
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(tok #(a b c) #(x y z)
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(and (bound (x 0) (y 0) (z 0)) (s= x 'a) (s= y 'b)))
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(tok #(a b c) #(x y z)
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(and (bound (x 0) (y 0) (z 0)) (s= x 'a) (s= y 'b)))
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(tok #(1 2 3 4 5) #(a b ~rest c)
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(s= c '(3 4 5)))
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(tok #&1 #&x
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(and (bound (x 0)) (s= x 1)))
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(tok #s(foo 1 2) #s(foo a b)
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(and (s= a 1) (s= b 2)))
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(tok #s(foo 1 2 3 4 5) #s(foo a b ~rest c)
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(s= c '(3 4 5)))
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;; head patterns
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;; See H-patterns
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;; dots patterns
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;; See EH-patterns
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;; and patterns
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(tok 1 (~and a 1)
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(and (bound (a 0)) (s= a 1)))
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(tok 1 (~and 1 1)
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'ok
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#:pre [(~and 1 2)] #:post [(~and 2 2)])
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(tok (1 2 3) (~and w (x y z))
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(and (bound (w 0) (x 0) (y 0) (z 0))
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(s= w '(1 2 3)) (s= x 1)))
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(tok (1 2 3) (~and (1 _ _) (_ 2 _) (_ _ 3))
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'ok)
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(tok (1 2 3) (~and (x _ _) (_ y _) (_ _ z))
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(and (bound (x 0) (y 0) (z 0))))
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;; and scoping
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(tok 1 (~and a (~fail #:unless (equal? (syntax->datum #'a) 1))))
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;; or patterns
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(tok 1 (~or 1 2 3)
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'ok)
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(tok 3 (~or 1 2 3)
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'ok)
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(tok (1) (~or (a) (a b) (a b c))
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(and (bound (a 0 #t) (b 0 #f) (c 0 #f)) (s= a 1) (a= b #f) (a= c #f)))
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(tok (1 2 3) (~or (a) (a b) (a b c))
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(and (bound (a 0 #t) (b 0 #f) (c 0 #f)) (s= a 1) (s= b 2) (s= c 3)))
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(tok 1 (~or 5 _)
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'ok)
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(tok #t (~or #t #f)
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'ok)
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(tok #t (~or (~and #t x) (~and #f x))
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(and (bound (x 0 #t))))
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;; describe
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(tok ((1 2) 3) ((~describe "one-two" (1 2)) 3))
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(terx ((1 3) 3) ((~describe #:opaque "one-two" (1 2)) 3)
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"one-two")
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(terx ((1 3) 3) ((~describe "one-two" (1 2)) 3)
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"2")
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(terx (1 3) ((~describe "one-two" (1 2)) 3)
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"one-two")
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;; epsilon-name patterns
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(tok (1) :one
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(and (bound (a 0)) (s= a 1)))
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(tok (1 2) :two
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(and (bound (a 0) (b 0)) (s= a 1) (s= b 2)))
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(tok (1 2) (~and x:two :two)
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(and (bound (x 0) (x.a 0) (a 0)) (s= x '(1 2)) (s= x.a 1) (s= a 1)))
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;; delimit-cut
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(tok (1 (2 3)) (1 (~or (~delimit-cut (2 ~! 4)) (2 3))))
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(tok (1 2 3) (1 2 3)
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'ok
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#:pre [(~delimit-cut (1 2 ~! 4))] #:post [])
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(define-syntax-class def
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#:no-delimit-cut
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#:literals (define-values)
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(pattern (define-values ~! (x:id ...) e:expr)))
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(tok (define-values (a b c) 1) d:def
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'ok)
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(terx (define-values (a 2) 3) (~or d:def e:expr)
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#rx"expected identifier")
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(terx* (define-values (a 2) 3) [d:def e:expr]
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#rx"expected identifier")
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;; commit
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(define-syntax-class xyseq
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#:commit
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(pattern ((~or x y) ...)))
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(tok (1 2 3 4 5 6 7 8)
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(~and ((~or s.x s.y) ...)
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(~fail #:unless (= (apply + (syntax->datum #'(s.x ...)))
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(apply + (syntax->datum #'(s.y ...))))
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"nope"))
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(equal? (syntax->datum #'(s.x ...)) '(1 2 3 4 8)))
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(terx (1 2 3 4 5 6 7 8)
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(~and s:xyseq
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(~fail #:unless (= (apply + (syntax->datum #'(s.x ...)))
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(apply + (syntax->datum #'(s.y ...))))
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"nope"))
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#rx"nope")
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(terx (1 2 3 4 5 6 7 8)
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(~and (~commit ((~or s.x s.y) ...))
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(~fail #:unless (= (apply + (syntax->datum #'(s.x ...)))
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(apply + (syntax->datum #'(s.y ...))))
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"nope"))
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#rx"nope")
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;; -- H patterns
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;; seq
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(tok (1 2 3) ((~seq 1 2) 3))
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(tok (1 2 3) (1 (~seq 2) 3))
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(tok (1 2 3) ((~seq) 1 2 3))
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;; or
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(tok (1 2 3) ((~or (~seq 1 2) 1) 3))
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(tok (1 2 3) ((~or 1 (~seq 1 2)) 3))
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(tok (1 2 3) ((~or (~seq 1) (~seq 1 2)) 3))
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(tok (1 2 3) ((~or (~seq 1) (~seq)) 1 2 3))
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(tok (1 2 3) ((~or (~seq 1) (~seq)) 1 2 3 (~or (~seq 4) (~seq))))
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;; describe
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(tok (1 2 3) ((~describe "one-two" (~seq 1 2)) 3))
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(terx (1 3 3) ((~describe #:opaque "one-two" (~seq 1 2)) 3)
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"one-two")
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;; Regression (2/2/2010)
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(define-splicing-syntax-class twoseq
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(pattern (~seq a b)))
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(tok (1 2 3 4) (x:twoseq ...))
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;; -- A patterns
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;; cut patterns
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(terx* (1 2 3) [(1 ~! 4) (1 _:nat 3)]
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"4" (not "exact nonnegative integer"))
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;; cut-in-and
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(terx* 1 [(~and a:nat ~! 2) b:nat]
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"2")
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;; bind patterns
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(tok 1 (~and x (~bind [y #'x]))
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(s= y '1))
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(tok 1 (~or x:id (~bind [x #'default]))
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(s= x 'default))
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;; fail patterns
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(tok (1 2 3) _
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'ok
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#:pre [(~fail "pass") (error 'wrong)] #:post [])
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(terx 1 (~fail "wanted 2")
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#rx"wanted 2")
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(terx 1 (~and n:nat (~fail #:unless (even? (syntax-e #'n)) "wanted even number"))
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#rx"wanted even number")
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;; fail as S-pattern
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(terx 1 (~fail "grr")
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#rx"grr")
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(tok (1 2 3) (x:nat y:nat (~parse (~or 2 3) (+ (syntax-e #'x) (syntax-e #'y))) z:nat))
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(terx (1 2 3) (x:nat y:nat (~parse 4 (+ (syntax-e #'x) (syntax-e #'y))) z:nat)
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"expected the literal 4")
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(terx (1 2 3) (x:nat y:nat (~parse (2 4) #'(x y)))
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"expected the literal 2")
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;; == syntax-parse: other feature tests
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(test-case "syntax-parse: #:context"
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(check-exn
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(lambda (exn)
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(regexp-match #rx"me: expected exact-nonnegative-integer" (exn-message exn)))
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(lambda ()
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(syntax-parse #'(m x) #:context #'me
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[(_ n:nat) 'ok])))
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(void))
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(test-case "syntax-parse: #:literals"
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(syntax-parse #'(0 + 1 * 2)
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#:literals (+ [times *])
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[(a + b * c) (void)]))
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;; == syntax classes: other feature tests
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;; #:auto-nested-attributes
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(define-syntax-class square0
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(pattern (x:two y:two)))
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(define-syntax-class square
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#:auto-nested-attributes
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(pattern (x:two y:two)))
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(test-case "nested attributes omitted by default"
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(check-equal? (syntax-class-attributes square0)
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'((x 0) (y 0)))
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(void))
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(test-case "nested attributes work okay"
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(check-equal? (syntax-class-attributes square)
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'((x 0) (x.a 0) (x.b 0) (y 0) (y.a 0) (y.b 0)))
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(void))
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;; conventions
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(define-syntax-class (nat> bound)
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#:description (format "natural number greater than ~s" bound)
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(pattern n:nat #:when (> (syntax-e #'n) bound)))
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(define-conventions nat-convs
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[N (nat> 0)])
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(test-case "syntax-parse: #:conventions"
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(syntax-parse #'(5 4)
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#:conventions (nat-convs)
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[(N ...) (void)]))
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(test-case "syntax-parse: #:conventions fail"
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(check-exn
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(lambda (exn)
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(check regexp-match? #rx"expected natural number greater than 0"
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(exn-message exn)))
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(lambda ()
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(syntax-parse #'(4 0)
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#:conventions (nat-convs)
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[(N ...) (void)])))
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(void))
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;; local conventions
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(define-syntax-class (nats> bound)
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#:local-conventions ([N (nat> bound)])
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(pattern (N ...)))
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(test-case "local conventions 1"
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(syntax-parse #'(1 2 3)
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#:local-conventions ([ns (nats> 0)])
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[ns (void)]))
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(test-case "local conventions 2"
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(check-exn
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(lambda (exn)
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(check regexp-match? #rx"expected natural number greater than 2"
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(exn-message exn)))
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(lambda ()
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(syntax-parse #'(1 2 3)
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#:local-conventions ([ns (nats> 2)])
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[ns (void)])))
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(void))
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;; == Lib tests
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;; static
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(tcerr "static: correct error"
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(let ()
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(define-syntax zero 0)
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(define-syntax (m stx)
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(syntax-parse stx
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[(_ x)
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#:declare x (static number? "identifier bound to number")
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#`(quote #,(attribute x.value))]))
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(m twelve))
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#rx"identifier bound to number")
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(test-case "static: works"
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(check-equal?
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(convert-syntax-error
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(let ()
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(define-syntax zero 0)
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(define-syntax (m stx)
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(syntax-parse stx
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[(_ x)
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#:declare x (static number? "identifier bound to number")
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#`(quote #,(attribute x.value))]))
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(m zero)))
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0)
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(void))
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;; -- test #:declare scoping
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(test-case "#:declare magical scoping"
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(syntax-parse #'(1 2)
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[(a b)
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#:declare a nat
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#:declare b (nat> (syntax-e #'a))
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(void)]))
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(tcerr "#:declare magical scoping 2"
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(syntax-parse #'(1 1)
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[(a b)
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#:declare a nat
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#:declare b (nat> (syntax-e #'a))
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(void)]))
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;; ---- Regression tests
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(test-case "pvar is syntax"
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;; from clklein 9/21/2011
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(check-true (syntax-parse #'(m 1 1 2 1 2 3)
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[(_ 1 ... . after-ones:expr)
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(syntax? #'after-ones)]))
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(void))
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(begin
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;; from samth 2/4/2012
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;; opaque head patterns used to propagate progress *with opaque marker* to tail
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(test-case "opaque H, ok"
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(check-equal? (syntax-parse #'(a b)
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[((~describe #:opaque "x" (~seq x)) y:id) 'ok])
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'ok))
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(test-case "opaque splicing stxclass, ok"
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(check-equal? (let ()
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(define-splicing-syntax-class foo
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#:opaque
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#:description "foo"
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(pattern (~seq x)))
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(syntax-parse #'(a b)
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[(f:foo y:id) 'ok]))
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'ok))
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(test-case "opaque empty H, ok"
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(check-equal? (syntax-parse #'(b)
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[((~describe #:opaque "x" (~seq)) y:id) 'ok])
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'ok))
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(test-case "opaque empty splicing stxclass, ok"
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(check-equal? (let ()
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(define-splicing-syntax-class foo
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#:opaque
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#:description "foo"
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(pattern (~seq)))
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(syntax-parse #'(b)
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[(f:foo y:id) 'ok]))
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'ok))
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(tcerr "extent of opaque in H pattern"
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(syntax-parse #'(a b)
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[((~describe #:opaque "x" (~seq x)) y:nat) (void)])
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(not #rx"expected x") ;; y:nat was incorrectly considered part of opaque region
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#rx"expected exact-nonnegative-integer")
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(tcerr "extent of opaque in splicing stxclass"
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(let ()
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(define-splicing-syntax-class foo
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#:description "foo"
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#:opaque
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(pattern (~seq x)))
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(syntax-parse #'(a b)
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[(f:foo n:nat) (void)]))
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(not #rx"expected foo") ;; y:nat was incorrectly considered part of opaque region
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#rx"expected exact-nonnegative-integer")
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(tcerr "extent of opaque in empty H pattern"
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(syntax-parse #'(b)
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[((~describe #:opaque "x" (~seq)) y:nat) (void)])
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(not #rx"expected x") ;; y:nat was incorrectly considered part of opaque region
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#rx"expected exact-nonnegative-integer")
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(tcerr "extent of opaque in empty splicing stxclass"
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(let ()
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(define-splicing-syntax-class foo
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#:description "foo"
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#:opaque
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(pattern (~seq)))
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(syntax-parse #'(b)
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[(f:foo n:nat) (void)]))
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(not #rx"expected foo") ;; y:nat was incorrectly considered part of opaque region
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#rx"expected exact-nonnegative-integer")
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)
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;; from Neil Van Dyke (7/28/2012)
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(test-case "specialized predicate-ellipsis-parser"
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;; test that it works on improper lists
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;; ... when input is syntax
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(check-eq? (syntax-parse #'(a b c . d) [(x:id ...) #t] [_ #f]) #f)
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;; ... and when input is stx pair (but not syntax)
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(check-eq? (syntax-parse #'(a b c . d) [(_ x:id ...) #t] [_ #f]) #f)
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;; test that it works on proper lists w/ embedded stxpairs
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(check-eq? (syntax-parse #'(a b . (c d)) [(x:id ...) #t] [_ #f]) #t)
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(check-eq? (syntax-parse #'(a b . (c d)) [(_ x:id ...) #t] [_ #f]) #t))
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;; from Eric Dobson (11/30/2012)
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(terx (x y) ((~describe #:opaque "an X" x:id) n:number)
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#rx"expected number"
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(not #rx"expected an X"))
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