From 43fb922de864e7c76dd00fa632eed96bc5f7a2a4 Mon Sep 17 00:00:00 2001
From: Ivan Enderlin <ivan.enderlin@hoa-project.net>
Date: Thu, 12 Mar 2020 14:49:43 +0100
Subject: [PATCH] feat(interface-types) Implement `Error` on errors.

---
 src/errors.rs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/errors.rs b/src/errors.rs
index 24ca556..5df5c49 100644
--- a/src/errors.rs
+++ b/src/errors.rs
@@ -3,6 +3,7 @@
 
 use crate::{ast::InterfaceType, interpreter::Instruction};
 use std::{
+    error::Error,
     fmt::{self, Display, Formatter},
     result::Result,
     string::{self, ToString},
@@ -28,6 +29,14 @@ pub struct WasmValueNativeCastError {
     pub to: InterfaceType,
 }
 
+impl Error for WasmValueNativeCastError {}
+
+impl Display for WasmValueNativeCastError {
+    fn fmt(&self, formatter: &mut Formatter) -> fmt::Result {
+        write!(formatter, "{:?}", self)
+    }
+}
+
 /// Structure to represent the errors for instructions.
 #[derive(Debug)]
 pub struct InstructionError {
@@ -47,6 +56,8 @@ impl InstructionError {
     }
 }
 
+impl Error for InstructionError {}
+
 impl Display for InstructionError {
     fn fmt(&self, formatter: &mut Formatter) -> fmt::Result {
         write!(
@@ -140,6 +151,8 @@ pub enum InstructionErrorKind {
     String(string::FromUtf8Error),
 }
 
+impl Error for InstructionErrorKind {}
+
 impl Display for InstructionErrorKind {
     fn fmt(&self, formatter: &mut Formatter) -> fmt::Result {
         match self {