One thing to note is that the new specs for clojure.core means that there
is a reasonable amount of (broken) code in the wild that now does not
compile.
I have filed PRs in a number of commonly used projects and while those were
all merged, most have not yet been released into new versions yet. Any
project that uses any of those projects via dependencies will also have
issues. So, expect to see some breakage if using the latest alpha. In
particular, ClojureScript itself had a bad ns declaration through version
1.9.93 so anything not on a fresh CLJS will likely see that.
The three most common things I saw were:
1. (ns ... (require ...) (import ...) ) instead of (ns ... (:require ...)
(:import ...) )
2. (fn a.b [] ...) - fully-qualified symbol names in fn (these are pretty
much always the result of a sloppy macro that expands to fn)
3. (let [{ ... :or {:a 1}} {}] ... ) - :or keys that are not simple
symbols. There were some accidental cases where this did something for
fully-qualified keyword keys in the past, but those were not intended and
are no longer accepted as of Clojure 1.9.0-alpha8. All of the cases I found
were actually typos though where the keyword was used instead of the symbol.
On Friday, August 19, 2016 at 1:15:06 PM UTC-5, Alex Miller wrote:
>
> Clojure 1.9.0-alpha11 is now available.
>
> Try it via
>
> - Download:
> https://repo1.maven.org/maven2/org/clojure/clojure/1.9.0-alpha11
> - Leiningen: [org.clojure/clojure "1.9.0-alpha11"]
>
> 1.9.0-alpha11 includes the following changes since 1.9.0-alpha10:
>
> Clojure now has specs for the following clojure.core macros: let, if-let,
> when-let, defn, defn-, fn, and ns. Because macro specs are checked during
> macroexpansion invalid syntax in these macros will now fail at compile time
> whereas some errors were caught at runtime and some were not caught at all.
>
> - CLJ-1914 - Fixed race condition in concurrent range realization
> - CLJ-1870 - Fixed reloading a defmulti removes metadata on the var
> - CLJ-1744 - Clear unused locals, which can prevent memory leaks in some
> cases
> - CLJ-1423 - Allow vars to be invoked with infinite arglists (also, faster)
> - CLJ-1993 - Added *print-namespace-maps* dynamic var that controls
> whether to use namespace map syntax for maps with keys from the same
> namespace. The default is false, but standard REPL bindings set this to
> true.
> - CLJ-1985 - Fixed with-gen of conformer losing unform fn
> - Fixed clojure.spec.test/check to skip spec'ed macros
> - Fixed regression from 1.9.0-alpha8 where type hints within destructuring
> were lost
> - Fixed clojure.spec/merge docstring to note merge doesn't flow conformed
> values
> - Fixed regex ops to use gen overrides if they are used
>
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