Optional.opAssign

Assign this optional to a none

  1. auto ref opAssign(None )
    struct Optional(T)
    ref
    opAssign
    ()
    (
    const None
    )
    if (
    isMutable!T
    )
  2. auto ref opAssign(U lhs)
  3. auto ref opAssign(Optional!U lhs)

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