[ANN] Clojure 1.9.0-alpha13

[Alex Miller]

Clojure 1.9.0-alpha13 is now available.

Try it via

- Download: https://repo1.maven.org/maven2/org/clojure/clojure/1.9.0-alpha13

- Leiningen: [org.clojure/clojure "1.9.0-alpha13"]

1.9.0-alpha13 includes the following changes since 1.9.0-alpha12:

- s/conform of nilable was always returning the passed value, not the conformed value

- s/nilable now creates a generator that returns nil 10% of the time (instead of 50% of the time)

- s/nilable now delays realizing the predicate spec until first use (better for creating recursive specs)

- clojure.spec.gen now provides a dynload version of clojure.test.check.generators/frequency

[Mark Engelberg]

It appears that the recent alphas are incompatible with the Counterclockwise REPL.

When I create an empty project in Counterclockwise, using this alpha, then when I try to launch a REPL, clojure.main throws an error saying:
Exception in thread "main" clojure.lang.ExceptionInfo: Call to clojure.core/defn did not conform to spec:
:clojure.spec/args  (completions* "Return a sequence of matching completions given a prefix string \n   and an optional current namespace." ([prefix] (completions* prefix *ns*)) ([prefix ns & {:keys #{filter}, :or {filter ccw.debug.serverrepl/starts-with-filter}}] (for [[kind completions] (potential-completions prefix ns) [match-symbol match-object :as completion] completions :let [f (filter-completion (name match-symbol) prefix filter)] :when f] {:kind kind, :completion match-symbol, :match match-object, :filter f})))
 #:clojure.spec{:args (completions* "Return a sequence of matching completions given a prefix string \n   and an optional current namespace." ([prefix] (completions* prefix *ns*)) ([prefix ns & {:keys #{filter}, :or {filter ccw.debug.serverrepl/starts-with-filter}}] (for [[kind completions] (potential-completions prefix ns) [match-symbol match-object :as completion] completions :let [f (filter-completion (name match-symbol) prefix filter)] :when f] {:kind kind, :completion match-symbol, :match match-object, :filter f})))}, compiling:(ccw/debug/serverrepl.clj:443:1)
    at clojure.lang.Compiler.load(Compiler.java:7441)

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[Mark Engelberg]

This is the line that is broken by the recent alphas:
https://github.com/laurentpetit/ccw.server/blob/master/src/ccw/debug/serverrepl.clj#L448

I remember reading somewhere the new alphas have a breaking change to the way :or destructuring works (but I don't remember the details), so I'm guessing this is the culprit.

[Alex Miller]

I think the problem is not on the :or but on the :keys which is being passed a set rather than a sequential?

[Herwig Hochleitner]

https://github.com/laurentpetit/ccw.server/pull/1

2016-09-29 14:37 GMT+02:00 Alex Miller <al...@puredanger.com>:

I think the problem is not on the :or but on the :keys which is being passed a set rather than a sequential?

[Laurent PETIT]

Thank you all, I have merged the pull request for ccw.server, and released ccw.server:0.2.1 to clojars.

The Pull Request on CCW itself to use the new ccw.server version is on its way, stay tuned...