fixed panic in ShiftRight when zeroing pages for the happy case

whisk · whisk · commit f0f8af2f5d5f · 2025-11-15T21:56:46.000+01:00
diff --git a/bitset.go b/bitset.go
@@ -1555,7 +1555,7 @@ func (b *BitSet) ShiftRight(bits uint) {
 		}
 	}
 
-	for i := int(idx-pages) + 1; i <= int(idx); i++ {
+	for i := int(idx-pages) + 1; i < len(b.set); i++ {
 		b.set[i] = 0
 	}
 }
diff --git a/bitset_test.go b/bitset_test.go
@@ -2448,6 +2448,9 @@ func TestShiftRightFull(t *testing.T) {
 		{
 			[]uint{0, 20, 40, 1260, 1280}, 1281,
 		},
+		{
+			[]uint{961}, 64,
+		},
 	}
 
 	test := func(data []uint, shiftDistance uint) {

Original file line number	Diff line number	Diff line change
`@@ -1555,7 +1555,7 @@ func (b *BitSet) ShiftRight(bits uint) {`
`1555`	`1555`	`}`
`1556`	`1556`	`}`
`1557`	`1557`
`1558`		`- for i := int(idx-pages) + 1; i <= int(idx); i++ {`
	`1558`	`+ for i := int(idx-pages) + 1; i < len(b.set); i++ {`
`1559`	`1559`	`b.set[i] = 0`
`1560`	`1560`	`}`
`1561`	`1561`	`}`
Original file line number	Diff line number	Diff line change
`@@ -2448,6 +2448,9 @@ func TestShiftRightFull(t *testing.T) {`
`2448`	`2448`	`{`
`2449`	`2449`	`[]uint{0, 20, 40, 1260, 1280}, 1281,`
`2450`	`2450`	`},`
	`2451`	`+ {`
	`2452`	`+ []uint{961}, 64,`
	`2453`	`+ },`
`2451`	`2454`	`}`
`2452`	`2455`
`2453`	`2456`	`test := func(data []uint, shiftDistance uint) {`