1 files changed, 77 insertions, 0 deletions
diff --git a/test/fixedbugs/issue59411.go b/test/fixedbugs/issue59411.go
new file mode 100644
index 0000000..fc35c98
--- /dev/null
+++ b/test/fixedbugs/issue59411.go
@@ -0,0 +1,77 @@
+// run
+
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"math"
+	"reflect"
+)
+
+func main() {
+	for i := 0; i < 100; i++ {
+		f()
+		g()
+	}
+}
+
+func f() {
+	// Allocate map.
+	m := map[float64]int{}
+	// Fill to just before a growth trigger.
+	const N = 13 << 4 // 6.5 * 2 * 2^k
+	for i := 0; i < N; i++ {
+		m[math.NaN()] = i
+	}
+	// Trigger growth.
+	m[math.NaN()] = N
+
+	// Iterate through map.
+	i := 0
+	for range m {
+		if i == 6 {
+			// Partway through iteration, clear the map.
+			clear(m)
+		} else if i > 6 {
+			// If we advance to the next iteration, that's a bug.
+			panic("BAD")
+		}
+		i++
+	}
+	if len(m) != 0 {
+		panic("clear did not empty the map")
+	}
+}
+
+func g() {
+	// Allocate map.
+	m := map[float64]int{}
+	// Fill to just before a growth trigger.
+	const N = 13 << 4 // 6.5 * 2 * 2^k
+	for i := 0; i < N; i++ {
+		m[math.NaN()] = i
+	}
+	// Trigger growth.
+	m[math.NaN()] = N
+
+	// Iterate through map.
+	i := 0
+	v := reflect.ValueOf(m)
+	iter := v.MapRange()
+	for iter.Next() {
+		if i == 6 {
+			// Partway through iteration, clear the map.
+			v.Clear()
+		} else if i > 6 {
+			// If we advance to the next iteration, that's a bug.
+			panic("BAD")
+		}
+		i++
+	}
+	if v.Len() != 0 {
+		panic("clear did not empty the map")
+	}
+}