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Handle multiple instantiation of a single expression.

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svn: r12148
This commit is contained in:
Sam Tobin-Hochstadt 2008-10-27 20:06:31 +00:00
parent d60ae208e1
commit 0c44c5ce40
1 changed files with 44 additions and 36 deletions
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10
collects/typed-scheme/typecheck/tc-expr-unit.ss
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@ -52,6 +52,14 @@
(define (split-last l)
(let-values ([(all-but last-list) (split-at l (sub1 (length l)))])
(values all-but (car last-list))))
(define (in-improper-stx stx)
(let loop ([l stx])
(match l
[#f null]
[(cons a b) (cons a (loop b))]
[e (list e)])))
(for/fold ([ty ty])
([inst (in-improper-stx inst)])
(cond [(not inst) ty]
[(not (or (Poly? ty) (PolyDots? ty)))
(tc-error/expr #:return (Un) "Cannot instantiate non-polymorphic type ~a" ty)]
@ -87,7 +95,7 @@
[_
(instantiate-poly ty (map parse-type (syntax->list inst)))]))]
[else
(instantiate-poly ty (map parse-type (syntax->list inst)))]))
(instantiate-poly ty (map parse-type (syntax->list inst)))])))
;; typecheck an identifier
;; the identifier has variable effect