Hi Alan, With validation turned on, Schema eagerly validates your full inputs so this is the expected (if a bit unfortunate) behavior.
There is a little context on the issue and some potential workarounds here : https://github.com/plumatic/schema/issues/340#issuecomment-185321295 Best, Jason On Saturday, December 9, 2017 at 7:53:47 PM UTC-8, Alan Thompson wrote: > > I am a huge fan of Plumatic Schema, and it regularly helps me to find > mistakes in my code early in the development process. However, I just > tracked down a very unexpected error when using a lazy infinite list such > as that produced by `(range)` > > Suppose you define two simple functions like `clojure.core/first`. One > doesn't use Schema and the other does: > > (defn show-1 > [arg] > (nth arg 0)) > > (s/defn show-2 :- s/Any > [arg :- [s/Any] ] > (nth arg 0)) > > (nl) (println "show-1") > (spyx (mapv show-1 [ [:a :b :c] (range) ])) > > (nl) (println "show-2") > (spyx (mapv show-2 [ [:a :b :c] (range) ])) > > > The results of running this code are: > > show-1 > (mapv show-1 [[:a :b :c] (range)]) => [:a 0] > > show-2 > > ERROR in (dotest-line-472) (Iterate.java:54) > Uncaught exception, not in assertion. > expected: nil > actual: *java.lang.OutOfMemoryError*: Java heap space > at clojure.lang.Iterate.next (Iterate.java:54) > clojure.lang.RT.next (RT.java:706) > ... > > > Apparently, turning on Schema validations causes the input collection to > be realized for `show-2` function call. > > I am generally not a big fan of (infinite) lazy seq's and don't use them > much. However, this one came up during a simple unit test and really had me > scratching the old noggin for quite a while..... > > I'm not sure if there is an easy way of enhancing Schema to avoid this > problem, or if it is just something one needs to be wary of. > > Alan > > > > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
