Add some basic trait impls for Line and Error

src/obj.rs

@@ -3,7 +3,7 @@ use std::collections::BTreeMap;
 /// A struct representing all the constituent pieces of an RFC1459/IRCv3 protocol line.
 ///
 /// `@tagkey=tagvalue :source COMMAND arg1 arg2 :arg3 with space`
-#[derive(Debug)]
+#[derive(Clone, PartialEq, Eq, Hash, Debug)]
 pub struct Line {
     /// [Message tags] of an IRC line.
     /// [`None`] if no message tags were present.

src/tokenise.rs

@@ -5,7 +5,7 @@ use super::Line;
 
 const TAG_STOP: [&[u8]; 2] = [b"", b"="];
 
-#[derive(Debug)]
+#[derive(Clone, Copy, PartialEq, Eq, Debug)]
 pub enum Error {
     /// An empty byte array was passed to the tokeniser.
     Empty,
@@ -19,6 +19,20 @@ pub enum Error {
     TagValueDecode,
 }
 
+impl std::fmt::Display for Error {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Error::Empty => write!(f, "empty slice passed to tokeniser"),
+            Error::MissingCommand => write!(f, "missing command"),
+            Error::CommandDecode => write!(f, "commands must be ascii encoded"),
+            Error::TagKeyDecode => write!(f, "message tag keys must be utf8 encoded"),
+            Error::TagValueDecode => write!(f, "message tag values must be utf8 encoded"),
+        }
+    }
+}
+
+impl std::error::Error for Error {}
+
 fn tag_decode(input: &str) -> String {
     let mut escaped = false;
     let mut output = String::with_capacity(input.len());