julia> struct InvalidatedBinding
           x::Int
       end

julia> struct Wrapper
           ib::InvalidatedBinding
       end

julia> makewib(x) = Wrapper(InvalidatedBinding(x))
makewib (generic function with 1 method)

julia> const gib = makewib(1)
Wrapper(InvalidatedBinding(1))

julia> fib() = gib.ib.x
fib (generic function with 1 method)

julia> fib()
1

julia> ci = only(methods(fib)).specializations.cache
CodeInstance for MethodInstance for fib()

julia> struct InvalidatedBinding
           x::Float64
       end

julia> ci.max_world
0xffffffffffffffff

julia> struct Wrapper
           ib::InvalidatedBinding
       end

julia> const gib = makewib(2.0)
Wrapper(InvalidatedBinding(2.0))

julia> ci.max_world
0x0000000000009789

julia> fib() === 2.0
true