From b476815f76eac2cbc3704fa91be5e22ef76fff8b Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Tue, 6 Sep 2016 11:31:20 -0700
Subject: [PATCH] Added test for '_this'.

---
 .../underscoreThisInDerivedClass01.ts         | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 tests/cases/compiler/underscoreThisInDerivedClass01.ts

diff --git a/tests/cases/compiler/underscoreThisInDerivedClass01.ts b/tests/cases/compiler/underscoreThisInDerivedClass01.ts
new file mode 100644
index 00000000000..0d3f5849cb1
--- /dev/null
+++ b/tests/cases/compiler/underscoreThisInDerivedClass01.ts
@@ -0,0 +1,23 @@
+// @target es5
+
+// Original test intent:
+// When arrow functions capture 'this', the lexical 'this' owner
+// currently captures 'this' using a variable named '_this'.
+// That means that '_this' becomes a reserved identifier in certain places.
+//
+// Constructors have adopted the same identifier name ('_this')
+// for capturing any potential return values from super calls,
+// so we expect the same behavior.
+
+class C {
+    constructor() {
+        return {};
+    }
+}
+
+class D extends C {
+    constructor() {
+        var _this = "uh-oh?";
+        super();
+    }
+}
\ No newline at end of file