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    //! Implements formating traits.
    #![allow(unused)]

    macro_rules! impl_hex_fmt {
        ($id:ident, $elem_ty:ident) => {
            impl ::fmt::LowerHex for $id {
                fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
                    use mem;
                    write!(f, "{}(", stringify!($id))?;
                    let n = mem::size_of_val(self) / mem::size_of::<$elem_ty>();
                    for i in 0..n {
                        if i > 0 {
                            write!(f, ", ")?;
                        }
                        self.extract(i).fmt(f)?;
                    }
                    write!(f, ")")
                }
            }
            impl ::fmt::UpperHex for $id {
                fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
                    write!(f, "{}(", stringify!($id))?;
                    for i in 0..$id::lanes() {
                        if i > 0 {
                            write!(f, ", ")?;
                        }
                        self.extract(i).fmt(f)?;
                    }
                    write!(f, ")")
                }
            }
            impl ::fmt::Octal for $id {
                fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
                    write!(f, "{}(", stringify!($id))?;
                    for i in 0..$id::lanes() {
                        if i > 0 {
                            write!(f, ", ")?;
                        }
                        self.extract(i).fmt(f)?;
                    }
                    write!(f, ")")
                }
            }
            impl ::fmt::Binary for $id {
                fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
                    write!(f, "{}(", stringify!($id))?;
                    for i in 0..$id::lanes() {
                        if i > 0 {
                            write!(f, ", ")?;
                        }
                        self.extract(i).fmt(f)?;
                    }
                    write!(f, ")")
                }
            }
        };
    }

    #[cfg(test)]
    macro_rules! test_hex_fmt_impl {
        ($id:ident, $elem_ty:ident, $($values:expr),+) => {
            #[test]
            fn hex_fmt() {
                use ::std::prelude::v1::*;
                use ::coresimd::simd::$id;
                for &i in [$($values),+].iter() {
                    let vec = $id::splat(i as $elem_ty);

                    let s = format!("{:#x}", vec);
                    let beg = format!("{}(", stringify!($id));
                    assert!(s.starts_with(&beg));
                    assert!(s.ends_with(")"));
                    let s: Vec<String> = s.replace(&beg, "").replace(")", "").split(",")
                        .map(|v| v.trim().to_string()).collect();
                    assert_eq!(s.len(), $id::lanes());
                    for (index, ss) in s.into_iter().enumerate() {
                        assert_eq!(ss, format!("{:#x}", vec.extract(index)));
                    }
                }
            }
            #[test]
            fn upper_hex_fmt() {
                use ::std::prelude::v1::*;
                use ::coresimd::simd::$id;
                for &i in [$($values),+].iter() {
                    let vec = $id::splat(i as $elem_ty);

                    let s = format!("{:#X}", vec);
                    let beg = format!("{}(", stringify!($id));
                    assert!(s.starts_with(&beg));
                    assert!(s.ends_with(")"));
                    let s: Vec<String> = s.replace(&beg, "").replace(")", "").split(",")
                        .map(|v| v.trim().to_string()).collect();
                    assert_eq!(s.len(), $id::lanes());
                    for (index, ss) in s.into_iter().enumerate() {
                        assert_eq!(ss, format!("{:#X}", vec.extract(index)));
                    }
                }
            }
            #[test]
            fn octal_fmt() {
                use ::std::prelude::v1::*;
                use ::coresimd::simd::$id;
                for &i in [$($values),+].iter() {
                    let vec = $id::splat(i as $elem_ty);

                    let s = format!("{:#o}", vec);
                    let beg = format!("{}(", stringify!($id));
                    assert!(s.starts_with(&beg));
                    assert!(s.ends_with(")"));
                    let s: Vec<String> = s.replace(&beg, "").replace(")", "").split(",")
                        .map(|v| v.trim().to_string()).collect();
                    assert_eq!(s.len(), $id::lanes());
                    for (index, ss) in s.into_iter().enumerate() {
                        assert_eq!(ss, format!("{:#o}", vec.extract(index)));
                    }
                }
            }
            #[test]
            fn binary_fmt() {
                use ::std::prelude::v1::*;
                use ::coresimd::simd::$id;
                for &i in [$($values),+].iter() {
                    let vec = $id::splat(i as $elem_ty);

                    let s = format!("{:#b}", vec);
                    let beg = format!("{}(", stringify!($id));
                    assert!(s.starts_with(&beg));
                    assert!(s.ends_with(")"));
                    let s: Vec<String> = s.replace(&beg, "").replace(")", "").split(",")
                        .map(|v| v.trim().to_string()).collect();
                    assert_eq!(s.len(), $id::lanes());
                    for (index, ss) in s.into_iter().enumerate() {
                        assert_eq!(ss, format!("{:#b}", vec.extract(index)));
                    }
                }
            }
        }
    }

    #[cfg(test)]
    macro_rules! test_hex_fmt {
        ($id:ident, $elem_ty:ident) => {
            test_hex_fmt_impl!(
                $id,
                $elem_ty,
                0 as $elem_ty,
                !(0 as $elem_ty),
                (1 as $elem_ty)
            );
        };
    }

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