Thank you Isaiah for pointing that out!

On Friday, September 23, 2016 at 12:06:17 PM UTC+8, Isaiah wrote:
>
> Use `global a = ...`
> Please see: 
> http://docs.julialang.org/en/latest/manual/variables-and-scoping/#hard-local-scope
>
> global variables are only inherited for reading but not for writing
>
>
>  
>

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