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    mod accum;
    mod collect;
    mod double_ended;
    mod exact_size;
    mod iterator;
    mod marker;

    pub use self::accum::{Product, Sum};
    pub use self::collect::{Extend, FromIterator, IntoIterator};
    pub use self::double_ended::DoubleEndedIterator;
    pub use self::exact_size::ExactSizeIterator;
    #[stable(feature = "rust1", since = "1.0.0")]
    pub use self::iterator::Iterator;
    #[stable(feature = "rust1", since = "1.0.0")]
    pub use self::marker::{FusedIterator, TrustedLen};