a = a or {}
a.__index = a
function a.new(construct, ...)
    local instance = setmetatable({}, a)
    if construct and a.constructor then a.constructor(instance, ...) end
    return instance
end
function a.constructor(self)
end
b = b or a.new()
b.__index = b
b.__base = a
function b.new(construct, ...)
    local instance = setmetatable({}, b)
    if construct and b.constructor then b.constructor(instance, ...) end
    return instance
end
function b.constructor(self)
    self.__base.constructor(self)
end
c = c or b.new()
c.__index = c
c.__base = b
function c.new(construct, ...)
    local instance = setmetatable({}, c)
    if construct and c.constructor then c.constructor(instance, ...) end
    return instance
end
function c.constructor(self)
    self.__base.constructor(self)
end
c.new(true)

I think it can be changed to this

a = a or {}
a.__index = a
function a.new(construct, ...)
    local instance = setmetatable({}, a)
    if construct and a.constructor then a.constructor(instance, ...) end
    return instance
end
function a.constructor(self)
end
b = b or a.new()
b.__index = b
b.__base = a
function b.new(construct, ...)
    local instance = setmetatable({}, b)
    if construct and b.constructor then b.constructor(instance, ...) end
    return instance
end
function b.constructor(self)
    b.__base.constructor(self) -- here
end
c = c or b.new()
c.__index = c
c.__base = b
function c.new(construct, ...)
    local instance = setmetatable({}, c)
    if construct and c.constructor then c.constructor(instance, ...) end
    return instance
end
function c.constructor(self)
    c.__base.constructor(self) -- here
end
c.new(true)

Uh oh!

Uh oh!

extends error! #142

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