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<< 

        # Proc.<<

(from ruby core)
---
    prc << g -> a_proc

---

Returns a proc that is the composition of this proc and the given *g*.
The returned proc takes a variable number of arguments, calls *g* with
them then calls this proc with the result.

    f = proc {|x| x * x }
    g = proc {|x| x + x }
    p (f << g).call(2) #=> 16

See Proc#>> for detailed explanations.

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