Thanks David.

Their advice is to "to turn on --jscomp_error=checkVars in which case you 
should get a clear error instead of a crash".

How do I turn on this flag from my project.clj?

On Thursday, 26 March 2015 04:52:35 UTC+2, David Nolen  wrote:
> FWIW, I see there are several similar looking reports on the Google Closure 
> Compiler GitHub issues:
> 
> 
> https://github.com/google/closure-compiler/issues/811
> 
> 
> 
> David
> 
> 
> On Wed, Mar 25, 2015 at 1:32 PM, Yehonathan Sharvit <[email protected]> wrote:
> 
> 
> It didn't happen in earlier versions of cljs. 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> On Wed, Mar 25, 2015 at 7:30 PM, David Nolen <[email protected]> wrote:
> 
> 
> 
> 
> 
> Looks like a Closure Compiler issue, you probably need to report this 
> elsewhere.
> 
> On Wednesday, March 25, 2015, Yehonathan Sharvit <[email protected]> wrote:
> 
> Applying optimizations :advanced
> 
> Compiling "public/clojurescript/prod/main.min.js" failed.
> 
> java.lang.RuntimeException: INTERNAL COMPILER ERROR.
> 
> Please report this problem.
> 
> 
> null
> 
>   Node(BLOCK): /controller_run_test.js:643:80
> 
> return (function $test$controller_run_test$on_scope_render_change($scope,_){
> 
>   Parent(FUNCTION ): controller_run_test.js:643:8
> 
> return (function 
> audyx$test$controller_run_test$on_scope_render_change($scope,_){
> 
> 
>         at 
> com.google.javascript.jscomp.NodeUtil.isNameDeclaration(NodeUtil.java:1845)
> 
>         at 
> com.google.javascript.jscomp.ReferenceCollectingCallback$Reference.isDeclarationHelper(ReferenceCollectingCallback.java:652)
> 
>         at 
> com.google.javascript.jscomp.ReferenceCollectingCallback$Reference.isDeclaration(ReferenceCollectingCallback.java:641)
> 
>         at 
> com.google.javascript.jscomp.ReferenceCollectingCallback$Reference.isInitializingDeclaration(ReferenceCollectingCallback.java:692)
> 
>         at 
> com.google.javascript.jscomp.ReferenceCollectingCallback$ReferenceCollection.getOneAndOnlyAssignment(ReferenceCollectingCallback.java:543)
> 
>         at 
> com.google.javascript.jscomp.ReferenceCollectingCallback$ReferenceCollection.isAssignedOnceInLifetime(ReferenceCollectingCallback.java:513)
> 
>         at 
> com.google.javascript.jscomp.InlineVariables$InliningBehavior.collectAliasCandidates(InlineVariables.java:179)
> 
>         at 
> com.google.javascript.jscomp.InlineVariables$InliningBehavior.afterExitScope(InlineVariables.java:159)
> 
>         at 
> com.google.javascript.jscomp.ReferenceCollectingCallback.exitScope(ReferenceCollectingCallback.java:253)
> 
>         at 
> com.google.javascript.jscomp.NodeTraversal.popScope(NodeTraversal.java:689)
> 
>         at 
> com.google.javascript.jscomp.NodeTraversal.popScope(NodeTraversal.java:680)
> 
>         at 
> com.google.javascript.jscomp.NodeTraversal.traverseFunction(NodeTraversal.java:624)
> 
>         at 
> com.google.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:574)
> 
>         at 
> com.google.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:582)
> 
>         at 
> com.google.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:582)
> 
>         at 
> com.google.javascript.jscomp.NodeTraversal.traverseFunction(NodeTraversal.java:622)
> 
>         at 
> com.google.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:574)
> 
>         at 
> com.google.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:582)
> 
>         at 
> com.google.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:582)
> 
>         at 
> com.google.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:582)
> 
>         at 
> com.google.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:582)
> 
>         at 
> com.google.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:582)
> 
>         at 
> com.google.javascript.jscomp.NodeTraversal.traverseRoots(NodeTraversal.java:318)
> 
>         at 
> com.google.javascript.jscomp.NodeTraversal.traverseRoots(NodeTraversal.java:549)
> 
>         at 
> com.google.javascript.jscomp.ReferenceCollectingCallback.process(ReferenceCollectingCallback.java:117)
> 
>         at 
> com.google.javascript.jscomp.InlineVariables.process(InlineVariables.java:86)
> 
>         at 
> com.google.javascript.jscomp.PhaseOptimizer$NamedPass.process(PhaseOptimizer.java:285)
> 
>         at 
> com.google.javascript.jscomp.PhaseOptimizer$Loop.process(PhaseOptimizer.java:453)
> 
>         at 
> com.google.javascript.jscomp.PhaseOptimizer.process(PhaseOptimizer.java:217)
> 
>         at com.google.javascript.jscomp.Compiler.optimize(Compiler.java:1972)
> 
>         at 
> com.google.javascript.jscomp.Compiler.compileInternal(Compiler.java:765)
> 
>         at com.google.javascript.jscomp.Compiler.access$000(Compiler.java:96)
> 
>         at com.google.javascript.jscomp.Compiler$3.call(Compiler.java:657)
> 
>         at com.google.javascript.jscomp.Compiler$3.call(Compiler.java:654)
> 
>         at com.google.javascript.jscomp.Compiler$4.call(Compiler.java:701)
> 
>         at java.util.concurrent.FutureTask.run(FutureTask.java:262)
> 
>         at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> 
>         at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> 
>         at java.lang.Thread.run(Thread.java:744)
> 
> Caused by: java.lang.NullPointerException
> 
>         ... 39 more
> 
> 
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