>> `f(x, y).foo(f(a, b), a +b) -> x + y` It replaces a generic function with an expression. So f(x,y) in the above is replaced with the sum of its arguments, regardless of what the arguments are. f(1,2) would be replaced with 3 and f(1, -x - y) would be replaced with 1 - x - y. (It does a little more than this as the discussion in the pull request records, but this is the main idea.)
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