Adding upstream version 1.21.8.upstream/1.21.8

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 45 insertions, 0 deletions

diff --git a/test/fixedbugs/issue54343.go b/test/fixedbugs/issue54343.go
new file mode 100644
index 0000000..10b91a5
--- /dev/null
+++ b/test/fixedbugs/issue54343.go
@@ -0,0 +1,45 @@
+// run
+
+// Copyright 2022 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 "runtime"
+
+func main() {
+	if wait() {
+		panic("GC'd early")
+	}
+	m = nil
+	if !wait() {
+		panic("never GC'd")
+	}
+}
+
+var m = New[int]().M
+
+func New[X any]() *T[X] {
+	p := new(T[X])
+	runtime.SetFinalizer(p, func(*T[X]) { close(done) })
+	return p
+}
+
+type T[X any] [4]int // N.B., [4]int avoids runtime's tiny object allocator
+
+func (*T[X]) M() {}
+
+var done = make(chan int)
+
+func wait() bool {
+	for i := 0; i < 10; i++ {
+		runtime.GC()
+		select {
+		case <-done:
+			return true
+		default:
+		}
+	}
+	return false
+}