From 17d445b66d76efa88d67ea37bd154cded316379b Mon Sep 17 00:00:00 2001
From: Lzu Tao <taolzu@gmail.com>
Date: Mon, 2 Sep 2019 20:38:40 +0700
Subject: [PATCH] Fix index out of bound in case of empty snippet

---
 clippy_lints/src/misc_early.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/clippy_lints/src/misc_early.rs b/clippy_lints/src/misc_early.rs
index 6ff2a404579..b90307af8ff 100644
--- a/clippy_lints/src/misc_early.rs
+++ b/clippy_lints/src/misc_early.rs
@@ -393,7 +393,8 @@ fn check_lit(self, cx: &EarlyContext<'_>, lit: &Lit) {
         // The `line!()` macro is compiler built-in and a special case for these lints.
         let lit_snip = match snippet_opt(cx, lit.span) {
             Some(snip) => {
-                if snip.contains('!') {
+                // The snip could be empty in case of expand from procedure macro
+                if snip.is_empty() || snip.contains('!') {
                     return;
                 }
                 snip
-- 
2.44.0