From cb4e9fbae02a933bd63ea3178c9a3461eec8f42c Mon Sep 17 00:00:00 2001
From: Jakob Stoklund Olesen <jolesen@mozilla.com>
Date: Fri, 1 Jul 2016 14:23:54 -0700
Subject: [PATCH] Give a better error message for unknown opcodes.

Include the name of the unrecognized opcode along with the line number.
---
 src/libreader/parser.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libreader/parser.rs b/src/libreader/parser.rs
index 7d25fc096b..1fe3368241 100644
--- a/src/libreader/parser.rs
+++ b/src/libreader/parser.rs
@@ -539,7 +539,7 @@ impl<'a> Parser<'a> {
         let opcode = if let Some(Token::Identifier(text)) = self.token() {
             match text.parse() {
                 Ok(opc) => opc,
-                Err(msg) => return err!(self.loc, msg),
+                Err(msg) => return err!(self.loc, "{}: '{}'", msg, text),
             }
         } else {
             return err!(self.loc, "expected instruction opcode");