Move-assign a basic_random_access_file from another.

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

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