From e336a96998710c94685d42435acccff15dc8cd4f Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Wed, 1 Jul 2020 09:06:51 +0200
Subject: FileSetConfig works with empty set of roots

Closes #5139
---
 crates/vfs/src/file_set.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crates/vfs/src/file_set.rs b/crates/vfs/src/file_set.rs
index d0ddeafe7..977ba3010 100644
--- a/crates/vfs/src/file_set.rs
+++ b/crates/vfs/src/file_set.rs
@@ -69,7 +69,7 @@ impl FileSetConfig {
             Ok(it) => it,
             Err(it) => it.saturating_sub(1),
         };
-        if path.starts_with(&self.roots[idx].0) {
+        if !self.roots.is_empty() && path.starts_with(&self.roots[idx].0) {
             self.roots[idx].1
         } else {
             self.len() - 1
-- 
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