refactor(prefix-map): remove the requirement of Borrow<Prefix> trait …

…for T from PrefixMap

BREAKING CHANGE:
 - Expose PrefixMap as public from lib and remove pub prefix_map mod.
 - Adapting PrefixMap APIs to the removal of requirement of Borrow<Prefix> Trait for T.

src/lib.rs

@@ -55,6 +55,7 @@
 
 use core::{cmp::Ordering, fmt, ops};
 pub use prefix::Prefix;
+pub use prefix_map::PrefixMap;
 use rand::{
     distributions::{Distribution, Standard},
     rngs::OsRng,
@@ -95,7 +96,7 @@ macro_rules! format {
 }
 
 mod prefix;
-pub mod prefix_map;
+mod prefix_map;
 
 /// Constant byte length of `XorName`.
 pub const XOR_NAME_LEN: usize = 32;

src/prefix.rs

@@ -9,7 +9,6 @@
 
 use crate::{XorName, XOR_NAME_LEN};
 use core::{
-    borrow::Borrow,
     cmp::{self, Ordering},
     fmt::{Binary, Debug, Display, Formatter, Result as FmtResult},
     hash::{Hash, Hasher},
@@ -281,12 +280,6 @@ impl Debug for Prefix {
     }
 }
 
-impl<T> Borrow<Prefix> for (Prefix, T) {
-    fn borrow(&self) -> &Prefix {
-        &self.0
-    }
-}
-
 #[derive(Debug)]
 pub struct FromStrError {
     pub invalid_char: char,