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local lanes = require "lanes".configure{ with_timers = true, verbose_errors = true} -- with timers enabled
local function foo()
local lanes = lanes -- lanes as upvalue
end
local g = lanes.gen( "*", {error_trace_level = "extended"}, foo)
-- this should raise an error as lanes.timer_lane is a Lane (a non-deep full userdata)
local res, err = pcall( g)
print( "Generating lane yielded: ", tostring( res), tostring( err))
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