1 files changed, 14 insertions, 0 deletions
diff --git a/test/writebarrier.go b/test/writebarrier.go
index 9b741a60df..dcd20a0225 100644
--- a/test/writebarrier.go
+++ b/test/writebarrier.go
@@ -144,3 +144,17 @@ type T8 struct {
 func f16(x []T8, y T8) []T8 {
 	return append(x, y) // ERROR "write barrier"
 }
+
+func t1(i interface{}) **int {
+	// From issue 14306, make sure we have write barriers in a type switch
+	// where the assigned variable escapes.
+	switch x := i.(type) { // ERROR "write barrier"
+	case *int:
+		return &x
+	}
+	switch y := i.(type) { // no write barrier here
+	case **int:
+		return y
+	}
+	return nil
+}