If I open a new window, read into it the results of a grep command, 
e.g.,

    :r !grep -nH somepattern somefileset

and then try to use that buffer as a quickfix list or location list 
with either the :cb or :lb commands, respectively, I get

    E37: No write since last change (add ! to override)

If I then try to add ! to the :cb or :lb commands, I get

    E477: No ! allowed

It seems to me that the :cb and :lb commands are missing the ability 
to handle a !.

The most recent version of vim I had to verify this with was 
7.0.178.

Regards,
Gary

-- 
Gary Johnson                 | Agilent Technologies
[EMAIL PROTECTED]     | Mobile Broadband Division
                             | Spokane, Washington, USA

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