#### basic_writable_pipe::operator=

Move-assign a `basic_writable_pipe` from another.

    basic_writable_pipe & operator=(
        basic_writable_pipe && other);
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Move-assign a `basic_writable_pipe` from a pipe of another executor type.

    template<
        typename Executor1>
    constraint< is_convertible< Executor1, Executor >::value, basic_writable_pipe & >::type operator=(
        basic_writable_pipe< Executor1 > && other);
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