Fix clippy lints.

Author: teymour-aldridge

src/element_ref/mod.rs

@@ -123,7 +123,7 @@ impl<'a> Iterator for Text<'a> {
         for edge in &mut self.inner {
             if let Edge::Open(node) = edge {
                 if let Node::Text(ref text) = node.value() {
-                    return Some(&*text);
+                    return Some(&**text);
                 }
             }
         }

src/node.rs

@@ -345,7 +345,7 @@ impl fmt::Debug for Element {
 }
 
 /// HTML Processing Instruction.
-#[derive(Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq)]
 pub struct ProcessingInstruction {
     /// The PI target.
     pub target: StrTendril,
@@ -360,9 +360,3 @@ impl Deref for ProcessingInstruction {
         self.data.deref()
     }
 }
-
-impl fmt::Debug for ProcessingInstruction {
-    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
-        write!(f, "{:?} {:?}", self, self.data)
-    }
-}

src/selector.rs

@@ -14,7 +14,7 @@ use crate::ElementRef;
 /// Wrapper around CSS selectors.
 ///
 /// Represents a "selector group", i.e. a comma-separated list of selectors.
-#[derive(Debug, Clone, PartialEq)]
+#[derive(Debug, Clone, PartialEq, Eq)]
 pub struct Selector {
     /// The CSS selectors.
     pub selectors: SmallVec<[parser::Selector<Simple>; 1]>,