More fun with undefined

[T.J. Crowder]

On 14 June 2012 23:10, T.J. Crowder <tj at crowdersoftware.com> wrote:

> The rule is simple: & evaluates true if its argument is undefined, false
> otherwise:
>

Slip of the fingers there. £, obviously. Not &. And again, the symbol is
unimportant for now.

-- T.J.
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