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Flip order of type simplification passes.

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This commit is contained in:
Vincent St-Amour 2011-07-22 16:38:15 -04:00
parent 5b6d0ae167
commit 84931448b5
1 changed files with 16 additions and 16 deletions
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32
collects/typed-scheme/typecheck/tc-app-helper.rkt
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@ -222,30 +222,30 @@
[candidates '()] ; from cases
[parts-acc '()]) ; from parts
;; discard subsumed cases (supertype modulo filters)
;; keep only the domains for which the associated function type
;; is consistent with the expected type
(if (not (null? cases))
(let ([head (car cases)] [tail (cdr cases)])
(if (is-subsumed-in? head tail)
(loop tail (cdr parts)
candidates parts-acc) ; we discard this one
(loop tail (cdr parts)
(cons head candidates) ; we keep this one
(cons (car parts) parts-acc))))
(if (returns-subtype-of-expected? (car cases))
(loop (cdr cases) (cdr parts)
(cons (car cases) candidates) ; we keep this one
(cons (car parts) parts-acc))
(loop (cdr cases) (cdr parts)
candidates parts-acc)) ; we discard this one
;; keep only the domains for which the associated function type
;; is consistent with the expected type
;; discard subsumed cases (supertype modulo filters)
(let loop ([cases candidates]
[parts parts-acc]
;; accumulators
[candidates '()]
[parts-acc '()])
(if (not (null? cases))
(if (returns-subtype-of-expected? (car cases))
(loop (cdr cases) (cdr parts)
(cons (car cases) candidates) ; we keep this one
(cons (car parts) parts-acc))
(loop (cdr cases) (cdr parts)
candidates parts-acc)) ; we discard this one
(let ([head (car cases)] [tail (cdr cases)])
(if (is-subsumed-in? head tail)
(loop tail (cdr parts)
candidates parts-acc) ; we discard this one
(loop tail (cdr parts)
(cons head candidates) ; we keep this one
(cons (car parts) parts-acc))))
;; among the domains that fit with the expected type, we only
;; need to keep the most liberal