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Fix type expansion suggestion.

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Closes PR14212.
This commit is contained in:
Vincent St-Amour 2013-12-02 12:20:36 -05:00
parent 095d8216e3
commit f2de6dfee9
1 changed files with 8 additions and 3 deletions
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11
pkgs/typed-racket-pkgs/typed-racket-lib/typed-racket/typecheck/tc-app-helper.rkt
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@ -306,9 +306,14 @@
;; function type, prune if possible.
[(Function: (list (arr: doms rngs rests drests kws) ...))
(match-let ([(list pdoms rngs rests drests) (possible-domains doms rests drests rngs (and expected (ret expected)))])
(let ([res (make-Function (map make-arr
pdoms rngs rests drests (make-list (length pdoms) null)))])
res))]
(if (= (length pdoms) (length doms))
;; pruning didn't improve things, return the original
;; (Note: pruning may have reordered clauses, so may not be `equal?' to
;; the original, which may confuse `:print-type''s pruning detection)
t
;; pruning helped, return pruned type
(make-Function (map make-arr
pdoms rngs rests drests (make-list (length pdoms) null)))))]
;; not a function type. keep as is.
[_ t]))