And a related bug/quirk: I had had
(defn- remm
"Remainder of a modulo b; unlike (rem a b) result is in [0,b) even if a is
negative."
([a b]
(let [r (rem a b)]
(if (< r 0)
(+ r b)
r))))
and evaluated
(defn- remm
"Remainder of a modulo b; unlike (rem a b) result is in [0,b) even if a is
negative."
(^long [^long a ^long b]
(let [r (rem a b)]
(if (< r 0)
(+ r b)
r))))
in the same namespace. After that, I ran a test from the namespace and
got a very weird failure:
#<ClassCastException java.lang.ClassCastException: thingy.core$remm
cannot be cast to clojure.lang.IFn$LLO>
Reloading the full namespace fixed it.
It looks like there's a failure to be as dynamic as people expect,
here; if a function is modified in a way that changes the hinting on
it, its callers apparently need to be recompiled or they'll crash
rather than transparently start using the new version. I'm not sure if
this is a bug or an expected limitation, though; unlike the above,
where an error message appeared that clearly was not applicable in
that situation.
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