From 04a92f9968e2ba91ee9b283f4080cbaa82959cdf Mon Sep 17 00:00:00 2001
From: Oliver Hamlet <oliver.hamlet@gmail.com>
Date: Sat, 6 Oct 2018 15:12:49 +0100
Subject: [PATCH] Implement the Error trait on the Error enum

---
 src/lib.rs | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/src/lib.rs b/src/lib.rs
index 85c2092..89a3e8d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -12,6 +12,7 @@ mod function;
 mod version;
 
 use std::collections::{HashMap, HashSet};
+use std::error;
 use std::ffi::OsStr;
 use std::fmt;
 use std::io;
@@ -46,6 +47,31 @@ impl From<io::Error> for Error {
     }
 }
 
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match self {
+            Error::ParsingIncomplete => write!(f, "More input was expected by the parser"),
+            Error::ParsingError => {
+                write!(f, "An error was encountered while parsing the expression")
+            }
+            Error::PeParsingError => write!(
+                f,
+                "An error was encountered while reading the version of an executable"
+            ),
+            Error::IoError(e) => e.fmt(f),
+        }
+    }
+}
+
+impl error::Error for Error {
+    fn cause(&self) -> Option<&error::Error> {
+        match self {
+            Error::IoError(e) => Some(e),
+            _ => None,
+        }
+    }
+}
+
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
 pub enum GameType {
     Tes4,