Hi,

can someone explain what macro definition environment and macro call 
environment?

- I was reading the following 
page: 
http://docs.julialang.org/en/release-0.4/manual/metaprogramming/#man-metaprogramming
  - it says in the Hygiene section : 
    Local variables are then renamed to be unique (using the gensym() 
<http://docs.julialang.org/en/release-0.4/stdlib/base/#Base.gensym> 
function, which generates new symbols), and *global variables are resolved 
within the macro definition environment. *


In a later passage:

Thanks.

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