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From: "Stefan Monnier" <monnier+gnu/emacs@rum.cs.yale.edu>
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Subject: Re: while-no-input
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> It is a general principle that to avoid using abnormal
> condition handling for programmed control flow.
> I think it is very unclean to treat ordinary input
> like a quit and then distinguish them later.
> So I don't think we should add this mechanism.
> 
> It is easy enough to do the job using input-pending-p.
> You can use
> 
>   (catch 'input
>     (...
>       (if (input-pending-p) (throw 'input nil))
>       ...))
> 
> if you want to avoid testing input-pending-p at various
> levels in the code.

That is not very useful if inside this body you use library
functions that take a long time to complete, such as file-operations
that dispatch to ange-ftp: you'd have to sprinkle (if (input-pending-p)
(throw 'input nil)) all over the ange-ftp code, just to help some
unrelated package like icomplete.


	Stefan