From 1ac90bb74be2eec589c6af3f24885fc01fae5494 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Philipp=20Br=C3=BCschweiler?= <blei42@gmail.com>
Date: Tue, 11 Jun 2013 11:38:59 +0200
Subject: [PATCH] lexer: show correct span on unrecognized token start

Fixes part of #7048.
---
 src/libsyntax/parse/lexer.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/libsyntax/parse/lexer.rs b/src/libsyntax/parse/lexer.rs
index 002a6caf85c5..474e93ed11a9 100644
--- a/src/libsyntax/parse/lexer.rs
+++ b/src/libsyntax/parse/lexer.rs
@@ -772,7 +772,11 @@ fn next_token_inner(rdr: @mut StringReader) -> token::Token {
       '/' => { return binop(rdr, token::SLASH); }
       '^' => { return binop(rdr, token::CARET); }
       '%' => { return binop(rdr, token::PERCENT); }
-      c => { rdr.fatal(fmt!("unknown start of token: %d", c as int)); }
+      c => {
+          // So the error span points to the unrecognized character
+          rdr.peek_span = codemap::mk_sp(rdr.last_pos, rdr.pos);
+          rdr.fatal(fmt!("unknown start of token: %d", c as int));
+      }
     }
 }