Debugging Closure-compiler Compiled Javascript

Question

I have a complex dojo app that works correctly uncompiled, but after compiling with Google\'s Closure Compiler, I get subtle differences in some behaviours.

As it is

Answer 1

With the help of Chad's answer, I found a bug where my working code like so:

a = [b, b = a][0]; // swap variable values

Was compiled to:

a = b;

It might be fixed in later versions, because tests with the online Closure compiler app don't demonstrate the same bug. Fixed it by not trying to be clever, and using a 3rd variable to hold the old value while swapping values.