diff --git a/tests/cases/compiler/controlFlowArrays.ts b/tests/cases/compiler/controlFlowArrays.ts
index 781b8c09d12..e89a2443753 100644
--- a/tests/cases/compiler/controlFlowArrays.ts
+++ b/tests/cases/compiler/controlFlowArrays.ts
@@ -147,4 +147,13 @@ function f15() {
         x.push("hello");
     }
     return x;  // string[]
+}
+
+function f16() {
+    let x;
+    let y;
+    (x = [], x).push(5);
+    (x.push("hello"), x).push(true);
+    ((x))[3] = { a: 1 };
+    return x;  // (string | number | boolean | { a: number })[]
 }
\ No newline at end of file