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diff --git a/test/fixedbugs/issue44370.dir/a.go b/test/fixedbugs/issue44370.dir/a.go
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+// Copyright 2021 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 a
+
+// A StoppableWaitGroup waits for a collection of goroutines to finish.
+type StoppableWaitGroup struct {
+ // i is the internal counter which can store tolerate negative values
+ // as opposed the golang's library WaitGroup.
+ i *int64
+}
+
+// NewStoppableWaitGroup returns a new StoppableWaitGroup. When the 'Stop' is
+// executed, following 'Add()' calls won't have any effect.
+func NewStoppableWaitGroup() *StoppableWaitGroup {
+ return &StoppableWaitGroup{
+ i: func() *int64 { i := int64(0); return &i }(),
+ }
+}