From 9f349385ec29ced175233cb0c3a247b87719cee3 Mon Sep 17 00:00:00 2001
From: Alexey Andreev <konsoletyper@gmail.com>
Date: Wed, 26 Apr 2023 16:25:25 +0200
Subject: [PATCH] classlib: fix issue in BitSet.set

---
 .../src/main/java/org/teavm/classlib/java/util/TBitSet.java | 6 ++++++
 .../test/java/org/teavm/classlib/java/util/BitSetTest.java  | 3 +++
 2 files changed, 9 insertions(+)

diff --git a/classlib/src/main/java/org/teavm/classlib/java/util/TBitSet.java b/classlib/src/main/java/org/teavm/classlib/java/util/TBitSet.java
index 41202ae44..03076c117 100644
--- a/classlib/src/main/java/org/teavm/classlib/java/util/TBitSet.java
+++ b/classlib/src/main/java/org/teavm/classlib/java/util/TBitSet.java
@@ -169,6 +169,9 @@ public class TBitSet extends TObject implements TCloneable, TSerializable {
         if (fromIndex > toIndex) {
             throw new TIndexOutOfBoundsException();
         }
+        if (fromIndex == toIndex) {
+            return;
+        }
         int fromDataIndex = fromIndex / 32;
         int toDataIndex = toIndex / 32;
         if (toIndex > length) {
@@ -224,6 +227,9 @@ public class TBitSet extends TObject implements TCloneable, TSerializable {
             return;
         }
         toIndex = TMath.min(length, toIndex);
+        if (fromIndex == toIndex) {
+            return;
+        }
         int fromDataIndex = fromIndex / 32;
         int toDataIndex = toIndex / 32;
         if (fromDataIndex == toDataIndex) {
diff --git a/tests/src/test/java/org/teavm/classlib/java/util/BitSetTest.java b/tests/src/test/java/org/teavm/classlib/java/util/BitSetTest.java
index a2067a29a..87c94ff78 100644
--- a/tests/src/test/java/org/teavm/classlib/java/util/BitSetTest.java
+++ b/tests/src/test/java/org/teavm/classlib/java/util/BitSetTest.java
@@ -878,6 +878,9 @@ public class BitSetTest {
 
         bs.set(2, 2);
         assertFalse("Bit got set incorrectly ", bs.get(2));
+
+        bs = new BitSet();
+        bs.set(0, 0);
     }
 
     @Test