From c68626dc2eb04d455ebe99555499e994cf6f1847 Mon Sep 17 00:00:00 2001
From: Lars Asplund <lars.anders.asplund@gmail.com>
Date: Sat, 9 Mar 2024 16:15:45 +0100
Subject: [PATCH] Removed Questasim compilation warning. Fixes #981.

---
 vunit/vhdl/string_ops/src/string_ops.vhd | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/vunit/vhdl/string_ops/src/string_ops.vhd b/vunit/vhdl/string_ops/src/string_ops.vhd
index 44798c38f..7750d4428 100644
--- a/vunit/vhdl/string_ops/src/string_ops.vhd
+++ b/vunit/vhdl/string_ops/src/string_ops.vhd
@@ -562,7 +562,7 @@ package body string_ops is
       stop_pos := stop;
     end if;
 
-    if substring = "" then
+    if substring'length = 0 then
       return start_pos;
     end if;