Fix some warnings

src/main.rs

@@ -3,7 +3,7 @@ mod file_io;
 mod parser;
 
 use file_io::open_file;
-use parser::{ParsedReid, Parser};
+use parser::Parser;
 use std::path::Path;
 
 fn main() {

src/parser.rs

@@ -193,15 +193,6 @@ impl Parser {
             self.move_cursor();
         }
     }
-
-    fn empty() -> Parser {
-        Parser {
-            text: Vec::new(),
-            cursor: 0,
-            character_number: 0,
-            line_number: 0,
-        }
-    }
 }
 
 #[derive(Debug)]
@@ -211,7 +202,6 @@ pub struct ParsedReid(Expression);
 pub enum Expression {
     BlockExpr(Position, Vec<Expression>),
     StatementExpr(Position, Statement),
-    EmptyExpr,
 }
 
 impl Expression {
@@ -312,13 +302,13 @@ pub struct Expect<'a> {
 }
 
 impl Expect<'_> {
-    pub fn get(mut self) -> Option<String> {
+    pub fn get(self) -> Option<String> {
         if self.text.is_some() {
             self.parser.move_cursor_multiple(self.len);
         }
         self.text
     }
-    pub fn get_or(mut self, error: CompilerError) -> Result<String, CompilerError> {
+    pub fn get_or(self, error: CompilerError) -> Result<String, CompilerError> {
         match self.get() {
             Some(text) => Ok(text),
             None => Err(error),