autocmd with

One of the options according to the help for buffer local autocmds is <buffer=abuf>. I can't seem to figure out how to use it. The help (:help <buffer=abuf>) provides an example

:au CursorHold <buffer=abuf> echo 'hold'

which seems to always generate

E680: <buffer=0>: invalid buffer number

How is <buffer=abuf> supposed to be used?

(This originally came up as a Stack Overflow question http://stackoverflow.com/questions/31820529/how-do-you-use-buffer-local-autocommands-in-vimscript)

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