1 files changed, 4 insertions, 1 deletions

diff --git a/llex.c b/llex.c
index bb81cec4..226127f6 100644
--- a/llex.c
+++ b/llex.c
@@ -82,7 +82,10 @@ void luaX_init (lua_State *L) {
 const char *luaX_token2str (LexState *ls, int token) {
   if (token < FIRST_RESERVED) {  /* single-byte symbols? */
     lua_assert(token == cast_uchar(token));
-    return luaO_pushfstring(ls->L, "'%c'", token);
+    if (lisprint(token))
+      return luaO_pushfstring(ls->L, "'%c'", token);
+    else  /* control character */
+      return luaO_pushfstring(ls->L, "'<\\%d>'", token);
   }
   else {
     const char *s = luaX_tokens[token - FIRST_RESERVED];