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On Wed, Feb 16, 2011 at 01:24:57PM +0200, Julien Duminil wrote:
> Maybe we could add an error/custom message to every nil variable.
> Plus, add of a function reason(nil_var) that give the message.

This idea is much more generally applicable.

One non-invasive implementation could be a library function:


If you never call this routine, you've got standard Lua.  Otherwise,
you can use it to deprecate features to your heart's content.


It could also be used to make Lua talk non-English.