asyncio: Pass cancellation from wrapping Future to wrapped Future. By Saúl Ibarra Corretgé (mostly).
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+:mod:`asyncio` -- Asynchronous I/O, event loop, coroutines and tasks
+====================================================================
+
+.. module:: asyncio
+ :synopsis: Asynchronous I/O, event loop, coroutines and tasks.
+
+.. versionadded:: 3.4
+
+
+Introduction
+------------
+
+This package includes a pluggable event loop, transport and protocol
+abstractions similar to those in Twisted, and a higher-level scheduler
+for coroutines and tasks based on ``yield from`` (:PEP:`380`).
+
+Full documentation is not yet ready; we hope to have it written
+before Python 3.4 leaves beta. Until then, the best reference is
+:PEP:`3156`. For a motivational primer on transports and protocols,
+see :PEP:`3153`.