Remove unused code

src/error.rs

@@ -1,6 +1,7 @@
 use alloc::boxed::Box;
 use alloc::string::{String, ToString};
 use core::fmt;
+use core::fmt::{Debug, Display, Formatter};
 use core::result;
 
 pub type Result<T> = result::Result<T, Error>;
@@ -23,40 +24,34 @@ struct ErrorImpl {
     msg: Box<str>,
 }
 
-impl fmt::Debug for Error {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        self.err.fmt(f)
+impl Display for ErrorImpl {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+        f.write_str(&self.msg)
     }
 }
 
-impl fmt::Display for Error {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        fmt::Debug::fmt(self, f)
+impl Debug for Error {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
+        write!(f, "Error({:?})", self.err.to_string())
     }
 }
 
-impl fmt::Debug for ErrorImpl {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        self.msg.fmt(f)
-    }
-}
-
-impl fmt::Display for ErrorImpl {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        fmt::Debug::fmt(&self, f)
+impl Display for Error {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
+        Display::fmt(&self.err, f)
     }
 }
 
 impl serde::de::StdError for Error {}
 
 impl serde::de::Error for Error {
-    fn custom<T: fmt::Display>(msg: T) -> Self {
+    fn custom<T: Display>(msg: T) -> Self {
         Error::msg(msg.to_string())
     }
 }
 
 impl serde::ser::Error for Error {
-    fn custom<T: fmt::Display>(msg: T) -> Self {
+    fn custom<T: Display>(msg: T) -> Self {
         Error::msg(msg.to_string())
     }
 }

src/io/core.rs

@@ -2,10 +2,6 @@ use alloc::vec::Vec;
 use core::fmt::{self, Display};
 use core::result;
 
-pub enum ErrorKind {
-    Other,
-}
-
 pub struct Error;
 
 impl Display for Error {
@@ -14,12 +10,6 @@ impl Display for Error {
     }
 }
 
-impl Error {
-    pub(crate) fn new(_kind: ErrorKind, _error: &'static str) -> Error {
-        Error
-    }
-}
-
 pub type Result<T> = result::Result<T, Error>;
 
 pub trait Write {