From 84c3830c6bb7b73a526dff81946ba53ebd4f0edb Mon Sep 17 00:00:00 2001
From: Andreas Rumpf <rumpf_a@web.de>
Date: Tue, 12 Jul 2016 02:14:26 +0200
Subject: [PATCH] fixes #4301

---
 compiler/lexer.nim | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/compiler/lexer.nim b/compiler/lexer.nim
index c6b11443d0..0a96ed0ba1 100644
--- a/compiler/lexer.nim
+++ b/compiler/lexer.nim
@@ -1079,6 +1079,9 @@ proc rawGetTok*(L: var TLexer, tok: var TToken) =
       tok.tokType = tkCharLit
     of '0'..'9':
       getNumber(L, tok)
+      let c = L.buf[L.bufpos]
+      if c in SymChars+{'_'}:
+        lexMessage(L, errInvalidToken, c & " (\\" & $(ord(c)) & ')')
     else:
       if c in OpChars:
         getOperator(L, tok)