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David Given wrote:
Hmm. If I'm *not* using globals, can I assign nil to _ENV to get runtime errors if I tyop the name of a local? 

local string_len = string.len
_ENV = nil
a = 5 -- oops, forgot to local this
What about functions? If I understood correctly, they too will be defined as fields of _ENV, as currently happens with _G. 

(but I'm not sure I got the details right)

  Enrico