I can't seem to make typed racket happy about using 'sort': #lang typed/racket
((ann sort ((Listof Integer) (Integer Integer -> Boolean) -> (Listof Integer))) '(3 5 4) (ann < (Integer Integer -> Boolean))) => Type Checker: Expected ((Listof Integer) (Integer Integer -> Boolean) -> (Listof Integer)), but got (All (a b) (case-lambda ((Listof a) (a a -> Boolean) [#:cache-keys? Boolean] -> (Listof a))((Listof a) (b b -> Boolean) [#:cache-keys? Boolean] #:key (a -> b) -> (Listof a)))) in: sort As far as I can tell, the type I specify is an instantiation of the given type for sort; my best guess is that the problem is that the type 'b' doesn't appear unless I use the #:key argument. My attempts to specify a #:key explicitly went even more horribly wrong. John
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