Checklist

software -> celery:4.0.2 (latentcall) kombu:4.0.2 py:3.5.3
            billiard:3.5.0.2 redis:2.10.5
platform -> system:Linux arch:64bit, ELF imp:CPython
loader   -> celery.loaders.app.AppLoader
settings -> transport:redis results:redis://localhost/

The documentation about linking tasks at http://docs.celeryproject.org/en/master/userguide/calling.html#linking-callbacks-errbacks doesn't work. It also doesn't match the documentation at http://docs.celeryproject.org/en/master/userguide/canvas.html#chains => "Here's an example errback..." which does work.

Steps to reproduce

Follow the code example for linking tasks at http://docs.celeryproject.org/en/master/userguide/calling.html#linking-callbacks-errbacks

Expected behavior

Prints the error and traceback

Actual behavior

produces a RuntimeError: Never call result.get() within a task! exception.