demonstrate `RHS != Self` use cases for `Add` and `Sub`#35793

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bors merged 2 commits intorust-lang:masterfrom matthew-piziak:add-rhs-example

Sep 3, 2016

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Commits on Aug 29, 2016

demonstrate RHS != Self use cases for Add and Sub
matthew-piziak
committed

Commits on Aug 31, 2016

replace ../ with ../../std/ to support core docs
matthew-piziak
committed