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- Subject: Re: Propsoal: a lua dialect without nil
- From: steve donovan <steve.j.donovan@...>
- Date: Wed, 16 Feb 2011 13:41:38 +0200
On Wed, Feb 16, 2011 at 1:24 PM, Julien Duminil
> Maybe we could add an error/custom message to every nil variable.
> Plus, add of a function reason(nil_var) that give the message.
It is quite attractive, as long as it isn't the dreaded errno which
has caused mischief in multi-threaded C programs. (One could make that
work in regular Lua provided the message was per-state)
Otherwise, suddenly there are a lot of different nils ....
I'm intrigued by the Go solution pointed out by Jim earlier:
val, reason := map["key"];
Again, one could ignore the extra value (although the implicit unpack
at end of table ctor or function call will cause its share of