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require("import") -- the import fn
import("friends") -- import lib into global
f=friends --alias
-- catching undefined variables
local env = _ENV -- Lua 5.2
if not env then env = getfenv () end -- Lua 5.1
setmetatable(env, {__index=function (t,i) error("undefined global variable `"..i.."'",2) end})
f.globalscope()
b1 = f.B(5)
a1 = f.A(10)
assert(f.get_val1(a1) == 10)
assert(f.get_val1(a1, 2) == 12)
assert(f.get_val2(a1) == 20)
assert(f.get_val3(a1) == 30)
assert(f.get_val1(100, 1, 2) == 100)
assert(f.mix(a1,b1) == 15);
d1 = f.D_i(7)
assert(f.get_val1(d1) == 7)
f.set(d1,9)
assert(f.get_val1(d1) == 9)
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