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    //! 16-bit wide portable packed vector types.

    simd_i_ty! {
        i8x2: 2, i8, m8x2, i8x2_tests, test_v16 |
        i8, i8 |
        x0, x1 |
        /// A 16-bit wide vector with 2 `i8` lanes.
    }

    simd_u_ty! {
        u8x2: 2, u8, m8x2, u8x2_tests, test_v16 |
        u8, u8 |
        x0, x1 |
        /// A 16-bit wide vector with 2 `u8` lanes.
    }

    simd_m_ty! {
        m8x2: 2, i8, m8x2_tests, test_v16 |
        i8, i8 |
        x0, x1 |
        /// A 16-bit wide vector mask with 2 lanes.
    }

    impl_from_bits!(i8x2: i8, i8x2_from_bits, test_v16 | u8x2, m8x2);
    impl_from_bits!(u8x2: u8, u8x2_from_bits, test_v16 | i8x2, m8x2);

    impl_from!(
        i8x2: i8,
        i8x2_from,
        test_v16 | f64x2,
        u64x2,
        m64x2,
        i64x2,
        f32x2,
        u32x2,
        i32x2,
        m32x2,
        u16x2,
        m16x2,
        u8x2,
        m8x2
    );
    impl_from!(
        u8x2: u8,
        u8x2_from,
        test_v16 | f64x2,
        u64x2,
        i64x2,
        m64x2,
        f32x2,
        u32x2,
        i32x2,
        m32x2,
        u16x2,
        m16x2,
        i8x2,
        m8x2
    );

    impl_from!(
        m8x2: i8,
        m8x2_from,
        test_v16 | m64x2,
        m32x2,
        m16x2
    );

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