Remove warnings

src/differ.rs

@@ -53,8 +53,8 @@ impl Differ{
 		if !(first_start < first_end && second_start < second_end){
 			return Vec::new();
 		}
-		let mut first = Vec::new();
-		let mut second = Vec::new();
+		let mut first;
+		let second;
 		if second_end - second_start < first_end - first_start{
 			first = self.dump("+", second_sequence, second_start, second_end);
 			second = self.dump("-", first_sequence, first_start, first_end);
@@ -73,7 +73,7 @@ impl Differ{
 		let mut res = Vec::new();
 		let (mut best_ratio, cutoff) = (0.74, 0.75);
 		let (mut best_i, mut best_j) = (0, 0);
-		let (mut second_sequence_str, mut first_sequence_str) = ("", "");
+		let (mut second_sequence_str, mut first_sequence_str);
 		let mut eqi: Option<usize> = None;
 		let mut eqj: Option<usize> = None;
 		for j in second_start..second_end{
@@ -103,7 +103,6 @@ impl Differ{
 			}
 			best_i = eqi.unwrap();
 			best_j = eqj.unwrap();
-			best_ratio = 1.0;
 		} else {
 			eqi = None;
 		}
@@ -187,7 +186,7 @@ impl Differ{
 			panic!("Second parameter must be 1 or 2");
 		}
 		let mut res = Vec::new();
-		let mut tag = String::new();
+		let tag;
 		if which == 1 {
 			tag = "- ".to_string();
 		} else {

src/lib.rs

@@ -107,7 +107,7 @@ pub fn context_diff<T: Sequence>(first_sequence: &T, second_sequence: &T, from_f
 			}
 		}
 		let file2_range = format_range_context(first.second_start, last.second_end);
-		res.push(format!("--- {} ----{}", file1_range, lineterm));
+		res.push(format!("--- {} ----{}", file2_range, lineterm));
 		any = false;
 		for opcode in group {
 			if opcode.tag == "replace" || opcode.tag == "insert" {

src/sequencematcher.rs

@@ -1,5 +1,5 @@
 use std::collections::HashMap;
-use std::cmp::{Ordering, max, min};
+use std::cmp::{max, min};
 use utils::calculate_ratio;
 use std::fmt::Debug;
 
@@ -67,7 +67,7 @@ impl<'a> Sequence for Vec<&'a str> {
 	}
 
 	fn at_index(&self, index: usize) -> Option<&str> {
-		if index < self.len() && index >= 0 {
+		if index < self.len() {
 			return Some(self[index])
 		}
 		None