Metaprogramming and variable scope (again)

Hi there, I’m having some troubles understanding variable scoping in macros. Here is the simplest code to show my problems

macro foo(f) 
    quote
        x = 2
        $f
    end
end

function bar(y)
    @foo sum(x*i for i in 1:y)
end

If I run this code from the REPL I get ERROR: UndefVarError: y not defined. However, if I define y in the REPL, then everything works fine. It is possible to make the above example work as it should?

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