how can I configure word highlighting in VIM ?

Hi,

I use vim to write my Ruby code. Say, I wrote a code as below :

foo = 2
def meth(arg)
puts arg
end

meth(foo)

Now suppose, I defined **foo** in the line#4. Now I am calling the method with **foo** as an argument, from line #20. Now suppose I am selecting the word, **foo** using command **viw**. Now I want all `foo` to be highlighted. If this can be done, it would help me in lots of scenarios.

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