diff --git a/src/od/parse_formats.rs b/src/od/parse_formats.rs
index a900a8eb4..ec6370f43 100644
--- a/src/od/parse_formats.rs
+++ b/src/od/parse_formats.rs
@@ -104,7 +104,7 @@ pub fn parse_format_flags(args: &Vec<String>) -> Result<Vec<ParsedFormatterItemI
     let mut formats = Vec::new();
 
     // args[0] is the name of the binary
-    let mut arg_iter = args.iter().skip(1);
+    let arg_iter = args.iter().skip(1);
     let mut expect_type_string = false;
 
     for arg in arg_iter {
@@ -129,7 +129,7 @@ pub fn parse_format_flags(args: &Vec<String>) -> Result<Vec<ParsedFormatterItemI
                 expect_type_string = true;
             }
         } else if arg.starts_with("-") {
-            let mut flags = arg.chars().skip(1);
+            let flags = arg.chars().skip(1);
             let mut format_spec = String::new();
             for c in flags {
                 if expect_type_string {
diff --git a/src/printf/tokenize/num_format/formatters/float_common.rs b/src/printf/tokenize/num_format/formatters/float_common.rs
index 1e40461bc..5e051055f 100644
--- a/src/printf/tokenize/num_format/formatters/float_common.rs
+++ b/src/printf/tokenize/num_format/formatters/float_common.rs
@@ -47,7 +47,7 @@ impl FloatAnalysis {
         // this fn assumes
         // the input string
         // has no leading spaces or 0s
-        let mut str_it = get_it_at(inprefix.offset, str_in);
+        let str_it = get_it_at(inprefix.offset, str_in);
         let mut ret = FloatAnalysis {
             len_important: 0,
             decimal_pos: None,
@@ -251,7 +251,7 @@ pub fn get_primitive_dec(
         } else {
             match first_segment.chars().next() {
                 Some('0') => {
-                    let mut it = second_segment.chars().enumerate();
+                    let it = second_segment.chars().enumerate();
                     let mut m: isize = 0;
                     let mut pre = String::from("0");
                     let mut post = String::from("0");
diff --git a/src/tail/tail.rs b/src/tail/tail.rs
index a1ed021c4..1a7714901 100755
--- a/src/tail/tail.rs
+++ b/src/tail/tail.rs
@@ -456,7 +456,7 @@ fn bounded_tail(mut file: &File, settings: &Settings) {
     // Find the position in the file to start printing from.
     match settings.mode {
         FilterMode::Lines(mut count, delimiter) => {
-            backwards_thru_file(&mut file, size, &mut buf, delimiter, &mut |byte| {
+            backwards_thru_file(&file, size, &mut buf, delimiter, &mut |byte| {
                 if byte == delimiter {
                     count -= 1;
                     count == 0