enforce lint groups

added remaining lint enforcements

src/parse/error.rs

@@ -41,7 +41,7 @@ pub enum ParseError {
 }
 
 impl fmt::Display for ParseError {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
             Self::IOError(_) => f.write_str("IO error"),
             Self::IncorrectFileHeader => {

src/parse/pos2.rs

@@ -98,13 +98,13 @@ impl ops::AddAssign for Pos2 {
 }
 
 impl fmt::Display for Pos2 {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "{:?}", self)
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::Debug::fmt(self, f)
     }
 }
 
 impl fmt::Debug for Pos2 {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "({}, {})", self.x, self.y)
     }
 }