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> Even so the function itself has no name, Lua is simply telling you the
> name of the variable. In fact in this case, the real function is a C
> function named 'str_gsub'.

Correct. Some errors use the name 'string.gsub' because that variable
still refer to the function. If you do the following,

> x = string.gsub
> string.gsub = nil             -- important!!

then no error messages (or anything else) will use the name
'string.gsub' for that function.

-- Roberto