haxl v2.1.0.0 Release Notes
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Add a new 'w' parameter to 'GenHaxl' to allow arbitrary writes during a computation. These writes are stored as a running log in the Env, and are not memoized. This allows users to extract information from a Haxl computation which throws. Our advise is to limit these writes to monitoring and debugging logs.
A 'WriteTree' constructor to maintain log of writes inside the Environment. This is defined to allow O(1) mappend.