From 33a0e6ec4cc890995f45d60e04cd3efa8025b824 Mon Sep 17 00:00:00 2001
From: Julius Rakow <julius@rakow.me>
Date: Sat, 25 Aug 2018 00:43:42 +0200
Subject: [PATCH] disable std::error in no_std

---
 src/common/stack.rs   | 2 ++
 src/lib.rs            | 3 +++
 src/validation/mod.rs | 2 ++
 3 files changed, 7 insertions(+)

diff --git a/src/common/stack.rs b/src/common/stack.rs
index 2366adb..9479fc5 100644
--- a/src/common/stack.rs
+++ b/src/common/stack.rs
@@ -1,4 +1,5 @@
 
+#[cfg(feature = "std")]
 use std::error;
 use std::fmt;
 
@@ -11,6 +12,7 @@ impl fmt::Display for Error {
 	}
 }
 
+#[cfg(feature = "std")]
 impl error::Error for Error {
 	fn description(&self) -> &str {
 		&self.0
diff --git a/src/lib.rs b/src/lib.rs
index 83b47da..7c86318 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -110,6 +110,7 @@ extern crate memory_units as memory_units_crate;
 pub extern crate nan_preserving_float;
 
 use std::fmt;
+#[cfg(feature = "std")]
 use std::error;
 
 /// Error type which can be thrown by wasm code or by host environment.
@@ -139,6 +140,7 @@ impl fmt::Display for Trap {
 	}
 }
 
+#[cfg(feature = "std")]
 impl error::Error for Trap {
 	fn description(&self) -> &str {
 		"runtime trap"
@@ -309,6 +311,7 @@ impl fmt::Display for Error {
 	}
 }
 
+#[cfg(feature = "std")]
 impl error::Error for Error {
 	fn description(&self) -> &str {
 		match *self {
diff --git a/src/validation/mod.rs b/src/validation/mod.rs
index 1620009..ed6f8ee 100644
--- a/src/validation/mod.rs
+++ b/src/validation/mod.rs
@@ -1,3 +1,4 @@
+#[cfg(feature = "std")]
 use std::error;
 use std::fmt;
 use hashmap_core::HashSet;
@@ -27,6 +28,7 @@ impl fmt::Display for Error {
 	}
 }
 
+#[cfg(feature = "std")]
 impl error::Error for Error {
 	fn description(&self) -> &str {
 		&self.0