Fix clippy errors.

src/error/error.rs

@@ -6,9 +6,9 @@ pub(crate) type Res<T, U> = IResult<T, U, CustomError>;
 
 #[derive(Debug)]
 pub enum CustomError {
-    Static(&'static str),
-    IO(std::io::Error),
-    Parser(ErrorKind),
+    Static(#[allow(dead_code)] &'static str),
+    IO(#[allow(dead_code)] std::io::Error),
+    Parser(#[allow(dead_code)] ErrorKind),
 }
 
 impl<I: std::fmt::Debug> ParseError<I> for CustomError {

src/parser/comment.rs

@@ -106,7 +106,6 @@ mod tests {
     use super::*;
     use crate::context::bind_context;
     use crate::context::Context;
-    use crate::context::ContextElement;
     use crate::context::GlobalSettings;
     use crate::context::List;
 

src/parser/headline.rs

@@ -77,9 +77,9 @@ fn _heading<'b, 'g, 'r, 's>(
         // If the section has a planning then the timestamp values are copied to the heading.
         if let DocumentElement::Section(inner_section) = &section {
             if let Some(Element::Planning(planning)) = inner_section.children.first() {
-                scheduled = planning.scheduled.clone();
-                deadline = planning.deadline.clone();
-                closed = planning.closed.clone();
+                scheduled.clone_from(&planning.scheduled);
+                deadline.clone_from(&planning.deadline);
+                closed.clone_from(&planning.closed);
             }
         }
         children.insert(0, section);

src/parser/keyword.rs

@@ -224,7 +224,6 @@ mod tests {
     use test::Bencher;
 
     use super::*;
-    use crate::parser::OrgSource;
 
     #[bench]
     fn bench_affiliated_keyword(b: &mut Bencher) {

src/parser/radio_link.rs

@@ -175,9 +175,7 @@ pub(crate) trait RematchObject<'x> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::context::Context;
     use crate::context::GlobalSettings;
-    use crate::context::List;
     use crate::parser::element_parser::element;
     use crate::types::Bold;
     use crate::types::Element;

src/types/mod.rs

@@ -6,7 +6,6 @@ mod greater_element;
 mod lesser_element;
 mod macros;
 mod object;
-mod remove_trailing;
 mod standard_properties;
 mod util;
 pub use affiliated_keyword::AffiliatedKeyword;

src/types/remove_trailing.rs

@@ -1,56 +0,0 @@
-pub(crate) trait RemoveTrailing: Iterator + Sized {
-    fn remove_trailing<R: Into<usize>>(self, amount_to_remove: R) -> RemoveTrailingIter<Self>;
-}
-
-impl<I> RemoveTrailing for I
-where
-    I: Iterator,
-{
-    fn remove_trailing<R: Into<usize>>(self, amount_to_remove: R) -> RemoveTrailingIter<Self> {
-        RemoveTrailingIter {
-            inner: self,
-            buffer: Vec::new(),
-            next_to_pop: 0,
-            amount_to_remove: amount_to_remove.into(),
-        }
-    }
-}
-
-pub(crate) struct RemoveTrailingIter<I: Iterator> {
-    inner: I,
-    buffer: Vec<I::Item>,
-    next_to_pop: usize,
-    amount_to_remove: usize,
-}
-
-impl<I: Iterator> Iterator for RemoveTrailingIter<I> {
-    type Item = I::Item;
-
-    fn next(&mut self) -> Option<Self::Item> {
-        if self.buffer.len() < self.amount_to_remove {
-            self.buffer.reserve_exact(self.amount_to_remove);
-        }
-        while self.buffer.len() < self.amount_to_remove {
-            if let Some(elem) = self.inner.next() {
-                self.buffer.push(elem);
-            } else {
-                // The inner was smaller than amount_to_remove, so never return anything.
-                return None;
-            }
-        }
-
-        let new_value = self.inner.next();
-        if self.amount_to_remove == 0 {
-            return new_value;
-        }
-
-        if let Some(new_value) = new_value {
-            let ret = std::mem::replace(&mut self.buffer[self.next_to_pop], new_value);
-            self.next_to_pop = (self.next_to_pop + 1) % self.amount_to_remove;
-            Some(ret)
-        } else {
-            // We have exactly the amount in the buffer than we wanted to cut off, so stop returning values.
-            None
-        }
-    }
-}