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-- catch "undefined" global variables. see FAQ.
do
local f=function(name)
local v=rawget(globals(),name)
if v then
return v
else
error("undefined global variable `"..name.."'")
end
end
settagmethod(tag(nil),"getglobal",f)
end
-- an example
a=1
c=3
print(a,b,c) -- 'b' is undefined
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