A refinement adds Array#second. A class Parent activates it with `using R` and defines `get`. A subclass Child (in the same file, after Parent's full definition) defines `get2` that also calls `arr.second`. What happens?
module R
refine Array do
def second; self[1]; end
end
end
class Parent
using R
def get(arr); arr.second; end
end
class Child < Parent
def get2(arr); arr.second; end
end
Parent.new.get([10, 20]) # ?
Child.new.get2([10, 20]) # ?