Closure.opAssign

Undocumented in source. Be warned that the author may not have intended to support it.
  1. auto ref opAssign(typeof(null) )
  2. auto ref opAssign(void function() fn)
    struct Closure
    ref pure @nogc nothrow @safe
    opAssign
    (
    void function
    ()
    fn
    )
  3. auto ref opAssign(void delegate() dg)

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