luau/prototyping/Examples/SmokeTest.lua

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local function id(x)
return x
end
local function comp(f)
return function(g)
return function(x)
return f(g(x))
end
end
end
local id2 = comp(id)(id)
local nil2 = id2(nil)
local a : any = nil
local b : nil = nil
local c : (nil) -> nil = nil
local d : (any & nil) = nil
local e : any? = nil
return id2(nil2)