destruct callbacks (and their closures)#39

Merged

mfontanini merged 1 commit intomfontanini:masterfrom

arvidn:destruction

Mar 17, 2018

Commits on Feb 8, 2018

destruct callbacks (and their closures) to ensure there are no reference cycles when destructing the consumer. This solves a hang in rd_kafka_destroy
arvidn
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