1 files changed, 34 insertions, 0 deletions
diff --git a/test/fixedbugs/issue33275.go b/test/fixedbugs/issue33275.go
new file mode 100644
index 0000000..f2ec24d
--- /dev/null
+++ b/test/fixedbugs/issue33275.go
@@ -0,0 +1,34 @@
+// skip
+
+// Copyright 2019 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 (
+	"fmt"
+	"time"
+)
+
+func main() {
+	// Make a big map.
+	m := map[int]int{}
+	for i := 0; i < 100000; i++ {
+		m[i] = i
+	}
+	c := make(chan string)
+	go func() {
+		// Print the map.
+		s := fmt.Sprintln(m)
+		c <- s
+	}()
+	go func() {
+		time.Sleep(1 * time.Millisecond)
+		// Add an extra item to the map while iterating.
+		m[-1] = -1
+		c <- ""
+	}()
+	<-c
+	<-c
+}