Bug 1039806 - UnboundLocalError: local variable 'output'; r=mshal

DONTBUILD (NPOTB)

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extra : rebase_source : 231b0dac997551660dd9c187880e80734a2d7300
extra : amend_source : 34dab55ff1d1d341e6ebe078747c4268ecc0096a