suzanne.soy/macrotypes
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

handle #f and #<syntax #f> expected types

Browse Source
This commit is contained in:
AlexKnauth 2016-04-21 11:02:26 -04:00
parent 579815512e
commit 92d2fe585a
1 changed files with 7 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
tapl/typecheck.rkt
View File

@ -136,14 +136,13 @@
(define-syntax add-expected
(syntax-parser
[(_ e τ) (syntax-property #'e 'expected-type #'τ)]))
[(_ e τ) (add-expected-ty #'e #'τ)]))
(define-syntax pass-expected
(syntax-parser
[(_ e stx) (syntax-property #'e 'expected-type
(syntax-property #'stx 'expected-type))]))
[(_ e stx) (add-expected-ty #'e (get-expected-type #'stx))]))
(define-for-syntax (add-expected-ty e ty)
(or (and (syntax-e ty)
(syntax-property e 'expected-type ((current-type-eval) ty)))
(if (and (syntax? ty) (syntax-e ty))
(syntax-property e 'expected-type ((current-type-eval) ty))
e))
;; type assignment
@ -164,7 +163,9 @@
(syntax-property e tag (syntax-local-introduce ((current-type-eval) τ))))
(define (add-expected-type e τ)
(syntax-property e 'expected-type τ)) ; dont type-eval?, ie expand?
(if (and (syntax? τ) (syntax-e τ))
(syntax-property e 'expected-type τ) ; dont type-eval?, ie expand?
e))
(define (get-expected-type e)
(syntax-property e 'expected-type))
(define (add-env e env) (syntax-property e 'env env))