From fdf826208fbb5bfafc93e54abee52317fe6e462f Mon Sep 17 00:00:00 2001
From: Ilya Kirillov <ilya.kirillov@jetbrains.com>
Date: Mon, 26 Sep 2022 14:29:16 +0200
Subject: [PATCH] Fix FqName.startsWith for fqNames shorter when the segment

---
 .../src/org/jetbrains/kotlin/name/FqNameUnsafe.java            | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/core/compiler.common/src/org/jetbrains/kotlin/name/FqNameUnsafe.java b/core/compiler.common/src/org/jetbrains/kotlin/name/FqNameUnsafe.java
index 1c31d782b90..a47eda38547 100644
--- a/core/compiler.common/src/org/jetbrains/kotlin/name/FqNameUnsafe.java
+++ b/core/compiler.common/src/org/jetbrains/kotlin/name/FqNameUnsafe.java
@@ -163,7 +163,8 @@ public final class FqNameUnsafe {
             return false;
 
         int firstDot = fqName.indexOf('.');
-        return fqName.regionMatches(0, segment.asString(), 0, firstDot == -1 ? fqName.length() : firstDot);
+        String segmentAsString = segment.asString();
+        return fqName.regionMatches(0, segmentAsString, 0, firstDot == -1 ? Math.max(fqName.length(), segmentAsString.length()) : firstDot);
     }
 
     @NotNull