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    pub use self::imp::*;

    #[cfg(not(dox))]
    mod imp {
        pub use core::option::Option;
        pub use core::clone::Clone;
        pub use core::marker::Copy;
        pub use core::mem;
    }

    #[cfg(dox)]
    mod imp {
        pub enum Option<T> {
            Some(T),
            None,
        }
        impl<T: Copy> Copy for Option<T> {}
        impl<T: Clone> Clone for Option<T> {
            fn clone(&self) -> Option<T> { loop {} }
        }

        pub trait Clone {
            fn clone(&self) -> Self;
        }

        #[lang = "copy"]
        pub trait Copy {}

        #[lang = "sync"]
        pub trait Sync {}
        impl<T> Sync for T {}

        #[lang = "sized"]
        pub trait Sized {}

        macro_rules! each_int {
            ($mac:ident) => (
                $mac!(u8);
                $mac!(u16);
                $mac!(u32);
                $mac!(u64);
                $mac!(usize);
                $mac!(i8);
                $mac!(i16);
                $mac!(i32);
                $mac!(i64);
                $mac!(isize);
            )
        }

        #[lang = "div"]
        pub trait Div<RHS> {
            type Output;
            fn div(self, rhs: RHS) -> Self::Output;
        }

        macro_rules! impl_div {
            ($($i:ident)*) => ($(
                impl Div<$i> for $i {
                    type Output = $i;
                    fn div(self, rhs: $i) -> $i { self / rhs }
                }
            )*)
        }
        each_int!(impl_div);

        #[lang = "shl"]
        pub trait Shl<RHS> {
            type Output;
            fn shl(self, rhs: RHS) -> Self::Output;
        }

        macro_rules! impl_shl {
            ($($i:ident)*) => ($(
                impl Shl<$i> for $i {
                    type Output = $i;
                    fn shl(self, rhs: $i) -> $i { self << rhs }
                }
            )*)
        }
        each_int!(impl_shl);

        #[lang = "mul"]
        pub trait Mul<RHS=Self> {
            type Output;
            fn mul(self, rhs: RHS) -> Self::Output;
        }

        macro_rules! impl_mul {
            ($($i:ident)*) => ($(
                impl Mul for $i {
                    type Output = $i;
                    fn mul(self, rhs: $i) -> $i { self * rhs }
                }
            )*)
        }
        each_int!(impl_mul);

        #[lang = "sub"]
        pub trait Sub<RHS=Self> {
            type Output;
            fn sub(self, rhs: RHS) -> Self::Output;
        }

        macro_rules! impl_sub {
            ($($i:ident)*) => ($(
                impl Sub for $i {
                    type Output = $i;
                    fn sub(self, rhs: $i) -> $i { self - rhs }
                }
            )*)
        }
        each_int!(impl_sub);

        #[lang = "bitor"]
        pub trait Bitor<RHS=Self> {
            type Output;
            fn bitor(self, rhs: RHS) -> Self::Output;
        }

        macro_rules! impl_bitor {
            ($($i:ident)*) => ($(
                impl Bitor for $i {
                    type Output = $i;
                    fn bitor(self, rhs: $i) -> $i { self | rhs }
                }
            )*)
        }
        each_int!(impl_bitor);

        pub mod mem {
            pub fn size_of_val<T>(_: &T) -> usize { 4 }
        }
    }

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