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Sorry, I was mistakenly attributing error() problems to traceback().

traceback() does start the traceback at level, while error() does not (level affects the location prepended to the string message only).

I think this issue with error() has been raised in the past, nothing new.

actual code this time:

    function foo()
        print(debug.traceback('hi from traceback', 2))  -- level 2, hide foo()
        error('hi from error', 2)
    end

    function bar()
        foo()
    end

    bar()

-->

$ lua traceback.lua
hi from traceback
stack traceback:
traceback.lua:8: in function 'bar'
traceback.lua:11: in main chunk
[C]: in ?
lua: traceback.lua:8: hi from error
stack traceback:
[C]: in function 'error'
traceback.lua:4: in function 'foo'
traceback.lua:8: in function 'bar'
traceback.lua:11: in main chunk
[C]: in ?