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> in not_present_here do
>  a = 1
> end

> will report an error on the assignment line that it attempted to index
> "(environment)" which was nil.  Now, while I imagine that someone at some point
> thought "oooh, nil environments would be useful", surely more useful would be
> that the 'in ... do' line cause an error along the lines of "Unable to set
> environment: expected table, got nil" ?


It is really hard to code serious stuff in Lua without some kind of
global environment protection (like etc/strict.lua). Such protection
would have caught this error. If you do not use one, you should know
what you're doing.