Issues with error(msg, 0)

["Thiago L." <fakedme@...>]

Lua 5.2.3  Copyright (C) 1994-2013 Lua.org, PUC-Rio
> xpcall(function() error("Hi!", 0) end, function(h) print(h) print(debug.traceback()) end)
Hi!
stack traceback:
    stdin:1: in function <stdin:1>
    [C]: in function 'error'
    stdin:1: in function <stdin:1>
    [C]: in function 'xpcall'
    stdin:1: in main chunk
    [C]: in ?
> c = coroutine.create(function() error("Hi!", 0) end) t = table.pack(coroutine.resume(c)) if not t[1] then print(t[2]) print(debug.traceback(c)) end
Hi!
stack traceback:
    [C]: in function 'error'
    stdin:1: in function <stdin:1>
> error("Hi!", 0)
Hi!
stack traceback:
    [C]: in function 'error'
    stdin:1: in main chunk
    [C]: in ?

Why's it giving me a stacktrace? I thought error(msg, 0) would hide them?

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