From 281c02d39d2b555bbb290719360b2b7f169c14b5 Mon Sep 17 00:00:00 2001
From: Ivan Enderlin <ivan.enderlin@hoa-project.net>
Date: Fri, 23 Nov 2018 16:54:06 +0100
Subject: [PATCH] doc(host) Fix the `Externals` example

The example is missing two things:

  * `index` is computed but not used,
  * `check_signature` is never used.

This patch tries to fix that.
---
 src/host.rs | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/host.rs b/src/host.rs
index 745f207..e0d4092 100644
--- a/src/host.rs
+++ b/src/host.rs
@@ -189,10 +189,16 @@ impl HostError {
 ///                 ))
 ///             }
 ///         };
-///
+/// 
+///         if self.check_signature(index, signature) {
+///             return Err(Error::Instantiation(
+///                 format!("Export {} has a bad signature", field_name)
+///             ));
+///         }
+/// 
 ///         Ok(FuncInstance::alloc_host(
 ///             Signature::new(&[ValueType::I32, ValueType::I32][..], Some(ValueType::I32)),
-///             ADD_FUNC_INDEX,
+///             index,
 ///         ))
 ///     }
 /// }