ClojureScript

Any leads on this specific directions on how to reproduce?

I'm afraid not. It happens for me 100% of the time from a fresh clone using script/repl in two different environments:

OS X 10.7.4

java version "1.6.0_33"
Java(TM) SE Runtime Environment (build 1.6.0_33-b03-424-11M3720)
Java HotSpot(TM) 64-Bit Server VM (build 20.8-b03-424, mixed mode)

Ubuntu 12.0.4

java version "1.7.0_03"
OpenJDK Runtime Environment (IcedTea7 2.1.1pre) (7~u3-2.1.1~pre1-1ubuntu3)
OpenJDK Client VM (build 22.0-b10, mixed mode, sharing)

I can reproduce this every time from a checkout.

Transcript:

tmp$ git clone https://github.com/clojure/clojurescript.git
Cloning into 'clojurescript'...
remote: Counting objects: 10307, done.
remote: Compressing objects: 100% (4349/4349), done.
remote: Total 10307 (delta 4828), reused 10032 (delta 4589)
Receiving objects: 100% (10307/10307), 1.37 MiB | 346 KiB/s, done.
Resolving deltas: 100% (4828/4828), done.
tmp$ cd clojurescript/
clojurescript$ git rev-parse HEAD
dae155a34cd30dabba94f90e306afac930345dcf
clojurescript$ ./script/bootstrap
Fetching Clojure...
Copying clojure-1.4.0/clojure-1.4.0.jar to lib/clojure.jar...
Cleaning up Clojure directory...
Cleaning up Clojure archive...
Fetching Google Closure library...
Fetching Google Closure library...
Cleaning up Google Closure library archive...
Fetching Google Closure compiler...
Cleaning up Google Closure compiler archive...
Building lib/goog.jar...
jar cf ./lib/goog.jar -C closure/library/closure/ goog
Fetching Rhino...
Copying rhino1_7R3/js.jar to lib/js.jar...
Cleaning up Rhino directory...
Cleaning up Rhino archive...
Copying closure/compiler/compiler.jar to lib/compiler.jar
[Bootstrap Completed]
clojurescript$ ./script/repl
Clojure 1.4.0
user=> (require '[cljs.repl :as repl])
nil
user=> (require '[cljs.repl.rhino :as rhino])
nil
user=> (repl/repl (rhino/repl-env))
"Type: " :cljs/quit " to quit"
ClojureScript:cljs.user> (+ 1 2 3)
6
ClojureScript:cljs.user> :cljs/quit
nil
user=> (repl/repl (rhino/repl-env))
"Type: " :cljs/quit " to quit"
ClojureScript:cljs.user> (+ 1 2 3)
"Error evaluating:" (+ 1 2 3) :as "((1 + 2) + 3);\n"
org.mozilla.javascript.EcmaError: TypeError: Cannot read property "StringBuffer" from undefined (cljs/core.cljs#6161)
at cljs/core.cljs:6161 (pr_sb)
at cljs/core.cljs:6175 (pr_str_with_opts)
at cljs/core.cljs:6219 (anonymous)
at cljs/core.cljs:6226 (anonymous)
at <cljs repl>:7

nil
ClojureScript:cljs.user> :cljs/quit
nil
user=>
clojurescript$ java -version
java version "1.6.0_24"
OpenJDK Runtime Environment (IcedTea6 1.11.3) (6b24-1.11.3-1ubuntu0.12.04.1)
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)

The root cause of this problem is some shared state used by each flavour of REPL environment:

Rhino: https://github.com/clojure/clojurescript/blob/master/src/clj/cljs/repl/rhino.clj#L19
Browser-REPL: https://github.com/clojure/clojurescript/blob/master/src/clj/cljs/repl/browser.clj#L18

Specifically related to CLJS-358 is the `loaded-libs` set used by the Rhino REPL environment; if I (reset! rhino/loaded-libs #{}) in between REPL sessions, then the failure noted in the ticket does not occur, and the REPL appears to be quite healthy.

(further discussion @ http://groups.google.com/group/clojure-dev/browse_thread/thread/df89f14489402e25)

Fixing this by bringing the loaded-libs set into the RhinoEnv REPL environment type ended up being fairly straightforward, and is enough for me to call it a fix for this issue (resolving the same issues for browser REPL is much more involved).

fixed, http://github.com/clojure/clojurescript/commit/3cdbf30a4965986e344f3918bad6543699c06566