How does Julia merge several exprs to one expr?

New to Julia
4

Thanks a lot to your help and your advice.
In broader context, my target is to creat a set of local varialbes. Firstly, create a NamedTuple came to my mind, but in practise, that is not convinient. So now I can get the target just like this:

macro localvars(expr)
    bb=[]
    for cc in expr.args
        if cc isa Expr && cc.head==:(=)
            append!(bb,[cc.args[1]])
        end
    end
    cvv=Expr(:tuple,(:($x=$x) for x in bb)...)
    bbres=quote
        let
            $expr
            $cvv
        end
    end |> esc
end

vars=@localvars begin
    a=1
    b=2
    c=a+b
end 

vars.a
vars.c

This is a little convinient for me