Buffer local autocmd with

How do you use <buffer=abuf> for buffer local autocmds.
According to the `:help <buffer=abuf>` an example usage would be

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

However this always seems to error out with

E680: <buffer=0>: invalid buffer number

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

Thanks,
Frank Dinoff

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