From b31bc2e4dfeffcfe0667b64d64df976920f83d16 Mon Sep 17 00:00:00 2001
From: Juggle Tux <juggle-tux@users.noreply.github.com>
Date: Thu, 15 Mar 2018 18:10:34 +0100
Subject: [PATCH] use `extern crate num` only once

to make my answer from [here](https://users.rust-lang.org/t/how-can-i-improve-my-too-object-oriented-code/16180/2?u=juggle-tux) working
---
 src/sim_elements.rs | 6 ++----
 src/simulation.rs   | 6 ++----
 src/vector.rs       | 6 ++----
 3 files changed, 6 insertions(+), 12 deletions(-)

diff --git a/src/sim_elements.rs b/src/sim_elements.rs
index 41d2e64..f20a56c 100644
--- a/src/sim_elements.rs
+++ b/src/sim_elements.rs
@@ -1,7 +1,5 @@
-extern crate num;
-
 use vector::Vector2;
-use num::{Float,Integer,NumCast};
+use num::{self,Float,Integer,NumCast};
 use simulation::SimData;
 
 pub trait Simulable<T,U> where T: Float, U: Integer {
@@ -40,4 +38,4 @@ impl<T,U> Simulable<T,U> for Planet<T> where T: Float, U: Integer + NumCast {
         my_data.vel = my_data.vel + inst_accel * dt;
         my_data.pos = my_data.pos + my_data.vel * dt;
     }
-}
\ No newline at end of file
+}
diff --git a/src/simulation.rs b/src/simulation.rs
index b48421e..92c021c 100644
--- a/src/simulation.rs
+++ b/src/simulation.rs
@@ -1,7 +1,5 @@
-extern crate num;
-
 use std::fmt;
-use num::{Float,Integer,NumCast};
+use num::{self,Float,Integer,NumCast};
 use vector::Vector2;
 use sim_elements::Simulable;
 
@@ -72,4 +70,4 @@ impl<T,U> fmt::Display for Simulation<T,U> where T: Float + fmt::Display, U: Int
         }
         Ok(())
     }
-}
\ No newline at end of file
+}
diff --git a/src/vector.rs b/src/vector.rs
index ff61b0e..03037da 100644
--- a/src/vector.rs
+++ b/src/vector.rs
@@ -1,7 +1,5 @@
-extern crate num;
-
 use std::fmt;
-use num::Float;
+use num::{self,Float};
 use std::ops::{Add,Sub,Mul,Div};
 
 #[derive(Debug, Eq, PartialEq, Clone, Copy)]
@@ -106,4 +104,4 @@ mod tests{
     fn norm_test() {
         assert_eq!(Vector2::<f64> { x: 4., y: -3.}.norm(), 5_f64);
     }
-}
\ No newline at end of file
+}