Sort and clean uses

fractional/src/fractional.rs

@@ -24,7 +24,7 @@
 //
 use std::cmp::Ordering;
 use std::convert::{TryFrom, TryInto};
-use std::fmt;
+use std::fmt::{Formatter, Display};
 use std::num::TryFromIntError;
 use std::ops::{Add,Sub,Neg,Mul,Div};
 
@@ -116,8 +116,8 @@ impl TryInto<(i32, i32)> for Fractional {
     }
 }
 
-impl fmt::Display for Fractional {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+impl Display for Fractional {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
         write!(f, "({}/{})", self.0, self.1)
     }
 }

fractional/src/vector.rs

@@ -18,8 +18,9 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 //
+use std::fmt::{Formatter, Display, Result};
 use std::ops::{Add, Sub, Neg, Mul, Div};
-use std::fmt;
+
 use crate::trigonometry::Trig;
 
 #[derive(Debug, Eq, Clone, Copy)]
@@ -61,10 +62,11 @@ where T: Add<Output = T> + Sub<Output = T> + Neg<Output = T>
     }
 }
 
-impl<T> fmt::Display for Vector<T>
-where T: Add + Sub + Neg + Mul + Div + Trig + fmt::Display + Copy {
-    fn fmt(&self, f :&mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "({}, {}, {})", self.0, self.1, self.2)
+impl<T> Display for Vector<T>
+where T: Add + Sub + Neg + Mul + Div + Trig + Display + Copy {
+    fn fmt(&self, f :&mut Formatter<'_>) -> Result {
+        let Vector(x, y, z) = self;
+        write!(f, "({}, {}, {})", x, y, z)
     }
 }