Hi everyone,
I am learning core.typed and ran into a stumbling block. When I use
annotations on normal functions and run 'check-ns', things work out ok,
;; works as expected
> (ann plus1 [Number -> Number])
> (defn plus1 [n] (+ n 1))
>
> ;; Works as expected
> (ann mult-arity [Number String -> (HMap :mandatory {:a Number :b String})])
> (defn mult-arity [n s] {:a n :b s})
but with functions that use destructuring in their body, I run into
problems.
;; Does not work.
> (ann map-span [Map Fn -> Map])
> (defn map-span [m f] (into {} (for [[k v] m] [k (f v)])))
>
clojure.lang.ExceptionInfo: Type Checker: Found 8 errors :: {:type-error
:top-level-error, :errors (#<ExceptionInfo clojure.lang.ExceptionInfo:
Polymorphic static method clojure.lang.RT/nth could not be applied to
arguments: Polymorphic Variables: x y Domains: (I (CountRange 1) (U (I
(clojure.lang.Seqable x) clojure.lang.Sequential) (Indexed x))) (Val 0) Any
(U nil (I (clojure.lang.Seqable x) clojure.lang.Sequential) (Indexed x))
Int y Arguments: Any (Val 0) nil Ranges: x
(U x y) ...
;; This also throws errors at the repl.
> (cf (fn [m f] (into {} (for [[k v] m] [k (f v)]))) [Map Fn -> Map])
I have been on the core.typed wiki and googled around but to no avail. I
have also used lighter amounts of destructuring in the function parameters
and run into similar errors. I am having trouble even understanding the
error messages (even after reading the pertinent wiki page) so if someone
could give me some insights on how to do this properly, I would really
appreciate it.
K
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