#### basic_file::operator=

Move-assign a `basic_file` from another.

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

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