Hi,

Android gradle plugin v0.10 has upgraded it's dependency to proguard from 
4.10 to 4.11. After that, my project no longer obfuscates, due to the 
following exception. Reverting back to 0.9 and proguard 4.10 doesn't rise 
this exception.

Unexpected error while evaluating instruction:
  Class       = [my/project/x/AccountDetailsKey]
  Method      = [swigToEnum$1542ff89(I)I]
  Instruction = [55] getfield #6
  Exception   = [java.lang.IllegalArgumentException] (Value is not a 
reference value [proguard.evaluation.value.UnknownIntegerValue])
Unexpected error while performing partial evaluation:
  Class       = [my/project/x/AccountDetailsKey]
  Method      = [swigToEnum$1542ff89(I)I]
  Exception   = [java.lang.IllegalArgumentException] (Value is not a 
reference value [proguard.evaluation.value.UnknownIntegerValue])

I found similar issue here: 
http://sourceforge.net/p/proguard/bugs/505/?limit=25
Seems like we would have a fix for that in upcoming proguard 4.12. 

Is there any way to change dependency for proguard version manually, or at 
least, can we count on you that you'll release 0.10.1 (or sth) with 
upgraded proguard dependency as soon as it is released? 

As a temporal workaround, you guys can add to your proguard-project.txt;

-optimizations !class/unboxing/enum

Cheers,
Mateusz

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