From 0dc7a57e1fb6064f14d1d9419457cd347af2a00f Mon Sep 17 00:00:00 2001
From: Henrixounez <30901439+Henrixounez@users.noreply.github.com>
Date: Tue, 28 Apr 2020 18:57:16 +0200
Subject: [PATCH] scanner: prevent panic with string starting on first
 character

---
 vlib/v/scanner/scanner.v | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/vlib/v/scanner/scanner.v b/vlib/v/scanner/scanner.v
index 44c72efdae..7fb12f60d5 100644
--- a/vlib/v/scanner/scanner.v
+++ b/vlib/v/scanner/scanner.v
@@ -833,7 +833,7 @@ fn (s &Scanner) count_symbol_before(p int, sym byte) int {
 fn (s mut Scanner) ident_string() string {
 	q := s.text[s.pos]
 	is_quote := q == single_quote || q == double_quote
-	is_raw := is_quote && s.text[s.pos - 1] == `r`
+	is_raw := is_quote && s.pos > 0 && s.text[s.pos - 1] == `r`
 	if is_quote && !s.is_inside_string {
 		s.quote = q
 	}