Why won't julia ERROR if a variable is not defined when scheduling?

New to Julia
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5

There is also the additional point that you’re (sometimes) allowed to reference variables before (in terms of location in code) they are declared, which is not related to multi-threading. E.g.

julia> function main()
           inc_c() = c += 1  # What is c at this point?
           c = 1
           inc_c()
           println(c)
       end;

julia> main()
2

(See also Is it okay that, in Julia, code that never executes can change the result of programs? - #21 by frankwswang)

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