Fix ClojureScript macroexpand failures

The `with-cljs-env` macro tried to grab the ClojureScript compiler env during
macroexpansion, at which point it may not be set yet. This was causing issues
where the ClojureScript compiler found an `*env*` of `nil`, causing a
NullPointerException, which was then getting swallowed by the test code.

Instead, grab the env at runtime.

Author: plexus

src/cider/nrepl/middleware/util/cljs.clj

@@ -49,7 +49,7 @@
   [x]
   (if (instance? clojure.lang.IDeref x) @x x))
 
-(defn- grab-cljs-env*
+(defn grab-cljs-env*
   [msg]
   (let [path (cljs-env-path)]
     (some-> msg
@@ -84,7 +84,7 @@
 (defmacro with-cljs-env [msg & body]
   (try
     (require 'cljs.env)
-    `(binding [cljs.env/*compiler* ~(grab-cljs-env* msg)]
+    `(binding [cljs.env/*compiler* (grab-cljs-env* ~msg)]
        ~@body)
     (catch Exception _)))