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I ported parts of mono TPL implementation to Silverlight to get Task type and I found these bugs.
The null condition bugs happens when using TaskCompletionSource - Wait() never gets called for task completion source task since function is null so it will return null. Constructors will wrap nulls with lambdas so function member will not be null and lambda will try to call null reference.
(btw. sorry for the last two commits i didn't realize code was using tabs :) )