-- output() outputs to stderr

local dump = require 'dump'

local function output(...)
    local need_newline = false
    for i, item in ipairs({...}) do
        -- XXX space logic could be cleverer, e.g. no space after newline
        local maybe_space = i > 1 and ' ' or ''
        local text = ({table=1, userdata=1})[type(item)] and
            dump(item) or tostring(item)
        io.stderr:write(maybe_space, text)
        need_newline = text:sub(-1) ~= '\n'
    end
    if need_newline then
        io.stderr:write('\n')
    end
end

return output