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define-type-alias supports type constructors

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This commit is contained in:
Stephen Chang 2016-03-18 20:57:02 -04:00
parent 4a44e51b80
commit 6f48690446
3 changed files with 29 additions and 1 deletions
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6
tapl/stlc+reco+var.rkt
View File

@ -21,7 +21,11 @@
(define-syntax define-type-alias
(syntax-parser
[(_ alias:id τ:type)
#'(define-syntax alias (make-variable-like-transformer #'τ.norm) #;(syntax-parser [x:id #'τ.norm]))]))
#'(define-syntax alias (make-variable-like-transformer #'τ.norm) #;(syntax-parser [x:id #'τ.norm]))]
[(_ (f:id x:id ...) ty)
#'(define-syntax (f stx)
(syntax-parse stx
[(_ x ...) #'ty]))]))
(define-typed-syntax define
[(_ x:id e)

1
tapl/tests/mlish/alex.mlish
View File

@ -13,3 +13,4 @@
(let ([y (f x)]) x))
(check-type try : (→/test X (→ X Y) X))

23
tapl/tests/mlish/inst.mlish
View File

@ -38,3 +38,26 @@
[else (ok 0)]))
(check-type f/cond : (→/test Bool (Result Int String)))
(define-type-alias (Read-Result A) (Result (× A (List Char)) String))
(define (alias-test -> (Read-Result A))
(Error "asd"))
(check-type alias-test : (→/test (Result (× A (List Char)) String)))
(check-type alias-test : (→/test (Read-Result A)))
(define (alias-test2 [in : A] -> (Read-Result A))
(ok (tup in nil)))
(define (alias-test3 [in : A] -> (Read-Result A))
(ok (tup in (list #\a #\b #\c))))
(check-type alias-test2 : (→/test A (Result (× A (List Char)) String)))
(check-type alias-test2 : (→/test A (Read-Result A)))
(check-type alias-test3 : (→/test A (Result (× A (List Char)) String)))
(check-type alias-test3 : (→/test A (Read-Result A)))
(check-type alias-test2 : (→/test B (Result (× B (List Char)) String)))
(check-type alias-test2 : (→/test B (Read-Result B)))
(check-type alias-test3 : (→/test B (Result (× B (List Char)) String)))
(check-type alias-test3 : (→/test B (Read-Result B)))