diff --git a/tests/baselines/reference/arrowFunctionContexts.js b/tests/baselines/reference/arrowFunctionContexts.js
index 1af0797b41f..64727398f72 100644
--- a/tests/baselines/reference/arrowFunctionContexts.js
+++ b/tests/baselines/reference/arrowFunctionContexts.js
@@ -116,8 +116,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.call(this, function () { return _this; }) || this;
-        return _this;
+        return _super.call(this, function () { return _this; }) || this;
     }
     return Derived;
 }(Base));
@@ -158,8 +157,7 @@ var M2;
     var Derived = (function (_super) {
         __extends(Derived, _super);
         function Derived() {
-            var _this = _super.call(this, function () { return _this; }) || this;
-            return _this;
+            return _super.call(this, function () { return _this; }) || this;
         }
         return Derived;
     }(Base));
diff --git a/tests/baselines/reference/baseCheck.js b/tests/baselines/reference/baseCheck.js
index 623cd152b9a..870f811c09f 100644
--- a/tests/baselines/reference/baseCheck.js
+++ b/tests/baselines/reference/baseCheck.js
@@ -43,16 +43,14 @@ var C = (function () {
 var ELoc = (function (_super) {
     __extends(ELoc, _super);
     function ELoc(x) {
-        var _this = _super.call(this, 0, x) || this;
-        return _this;
+        return _super.call(this, 0, x) || this;
     }
     return ELoc;
 }(C));
 var ELocVar = (function (_super) {
     __extends(ELocVar, _super);
     function ELocVar(x) {
-        var _this = _super.call(this, 0, loc) || this;
-        return _this;
+        return _super.call(this, 0, loc) || this;
     }
     ELocVar.prototype.m = function () {
         var loc = 10;
diff --git a/tests/baselines/reference/captureThisInSuperCall.js b/tests/baselines/reference/captureThisInSuperCall.js
index 069871f598e..2c4df5db961 100644
--- a/tests/baselines/reference/captureThisInSuperCall.js
+++ b/tests/baselines/reference/captureThisInSuperCall.js
@@ -22,8 +22,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.call(this, { test: function () { return _this.someMethod(); } }) || this;
-        return _this;
+        return _super.call(this, { test: function () { return _this.someMethod(); } }) || this;
     }
     B.prototype.someMethod = function () { };
     return B;
diff --git a/tests/baselines/reference/checkForObjectTooStrict.js b/tests/baselines/reference/checkForObjectTooStrict.js
index 156608bd6b5..ade99e9319b 100644
--- a/tests/baselines/reference/checkForObjectTooStrict.js
+++ b/tests/baselines/reference/checkForObjectTooStrict.js
@@ -49,16 +49,14 @@ var Foo;
 var Bar = (function (_super) {
     __extends(Bar, _super);
     function Bar() {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return Bar;
 }(Foo.Object));
 var Baz = (function (_super) {
     __extends(Baz, _super);
     function Baz() {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return Baz;
 }(Object));
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing5.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing5.js
index 3174bebd11d..8c7f18b77f6 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing5.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing5.js
@@ -25,8 +25,7 @@ var Based = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.call(this, _this.x) || this;
-        return _this;
+        return _super.call(this, this.x) || this;
     }
     return Derived;
 }(Based));
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing7.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing7.js
index 364aed4d4b0..ca12c16e047 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing7.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing7.js
@@ -23,8 +23,7 @@ var Base = (function () {
 var Super = (function (_super) {
     __extends(Super, _super);
     function Super() {
-        var _this = _super.call(this, (function () { return _this; })) || this;
-        return _this;
+        return _super.call(this, (function () { return _this; })) || this;
     }
     return Super;
 }(Base));
diff --git a/tests/baselines/reference/classSideInheritance2.js b/tests/baselines/reference/classSideInheritance2.js
index 475f9bd4ceb..67ee666749b 100644
--- a/tests/baselines/reference/classSideInheritance2.js
+++ b/tests/baselines/reference/classSideInheritance2.js
@@ -29,8 +29,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var SubText = (function (_super) {
     __extends(SubText, _super);
     function SubText(text, span) {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return SubText;
 }(TextBase));
diff --git a/tests/baselines/reference/classSideInheritance3.js b/tests/baselines/reference/classSideInheritance3.js
index 361378c3ff5..589dd81c5c6 100644
--- a/tests/baselines/reference/classSideInheritance3.js
+++ b/tests/baselines/reference/classSideInheritance3.js
@@ -42,8 +42,7 @@ var B = (function (_super) {
 var C = (function (_super) {
     __extends(C, _super);
     function C(x) {
-        var _this = _super.call(this, x) || this;
-        return _this;
+        return _super.call(this, x) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/classUpdateTests.js b/tests/baselines/reference/classUpdateTests.js
index 9809966c4c2..53ef71d0e4b 100644
--- a/tests/baselines/reference/classUpdateTests.js
+++ b/tests/baselines/reference/classUpdateTests.js
@@ -189,8 +189,7 @@ var H = (function () {
 var I = (function (_super) {
     __extends(I, _super);
     function I() {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     } // ERROR - no super call allowed
     return I;
 }(Object));
diff --git a/tests/baselines/reference/collisionSuperAndParameter.js b/tests/baselines/reference/collisionSuperAndParameter.js
index 750ae15ef0a..f5765043c55 100644
--- a/tests/baselines/reference/collisionSuperAndParameter.js
+++ b/tests/baselines/reference/collisionSuperAndParameter.js
@@ -124,8 +124,7 @@ var Foo2 = (function (_super) {
 var Foo4 = (function (_super) {
     __extends(Foo4, _super);
     function Foo4(_super) {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     Foo4.prototype.y = function (_super) {
         var _this = this;
diff --git a/tests/baselines/reference/collisionSuperAndPropertyNameAsConstuctorParameter.js b/tests/baselines/reference/collisionSuperAndPropertyNameAsConstuctorParameter.js
index 269881b3b90..5fa7fe29091 100644
--- a/tests/baselines/reference/collisionSuperAndPropertyNameAsConstuctorParameter.js
+++ b/tests/baselines/reference/collisionSuperAndPropertyNameAsConstuctorParameter.js
@@ -44,8 +44,7 @@ var a = (function () {
 var b1 = (function (_super) {
     __extends(b1, _super);
     function b1(_super) {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return b1;
 }(a));
@@ -61,8 +60,7 @@ var b2 = (function (_super) {
 var b3 = (function (_super) {
     __extends(b3, _super);
     function b3(_super) {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return b3;
 }(a));
diff --git a/tests/baselines/reference/commentsInheritance.js b/tests/baselines/reference/commentsInheritance.js
index 294f3a33690..a8a8d5fa889 100644
--- a/tests/baselines/reference/commentsInheritance.js
+++ b/tests/baselines/reference/commentsInheritance.js
@@ -227,8 +227,7 @@ var c2 = (function () {
 var c3 = (function (_super) {
     __extends(c3, _super);
     function c3() {
-        var _this = _super.call(this, 10) || this;
-        return _this;
+        return _super.call(this, 10) || this;
     }
     /** c3 f1*/
     c3.prototype.f1 = function () {
diff --git a/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType2.js b/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType2.js
index a60eb4de056..c5e27748f52 100644
--- a/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType2.js
+++ b/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType2.js
@@ -47,8 +47,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived(x) {
-        var _this = _super.call(this, x) || this;
-        return _this;
+        return _super.call(this, x) || this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/constructorOverloads2.js b/tests/baselines/reference/constructorOverloads2.js
index c26d031656f..2d26194f2e7 100644
--- a/tests/baselines/reference/constructorOverloads2.js
+++ b/tests/baselines/reference/constructorOverloads2.js
@@ -40,8 +40,7 @@ var FooBase = (function () {
 var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo(x, y) {
-        var _this = _super.call(this, x) || this;
-        return _this;
+        return _super.call(this, x) || this;
     }
     Foo.prototype.bar1 = function () { };
     return Foo;
diff --git a/tests/baselines/reference/declFileGenericType2.js b/tests/baselines/reference/declFileGenericType2.js
index 328ab0cd949..a51254122ed 100644
--- a/tests/baselines/reference/declFileGenericType2.js
+++ b/tests/baselines/reference/declFileGenericType2.js
@@ -58,8 +58,7 @@ var templa;
             var AbstractElementController = (function (_super) {
                 __extends(AbstractElementController, _super);
                 function AbstractElementController() {
-                    var _this = _super.call(this) || this;
-                    return _this;
+                    return _super.call(this) || this;
                 }
                 return AbstractElementController;
             }(templa.mvc.AbstractController));
diff --git a/tests/baselines/reference/decoratorOnClassConstructor2.js b/tests/baselines/reference/decoratorOnClassConstructor2.js
index 44bde0a171d..ce323e8ed1e 100644
--- a/tests/baselines/reference/decoratorOnClassConstructor2.js
+++ b/tests/baselines/reference/decoratorOnClassConstructor2.js
@@ -45,8 +45,7 @@ var _0_ts_2 = require("./0.ts");
 var C = (function (_super) {
     __extends(C, _super);
     function C(prop) {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return C;
 }(_0_ts_1.base));
diff --git a/tests/baselines/reference/decoratorOnClassConstructor3.js b/tests/baselines/reference/decoratorOnClassConstructor3.js
index 5130986b1f7..f06bf80b21d 100644
--- a/tests/baselines/reference/decoratorOnClassConstructor3.js
+++ b/tests/baselines/reference/decoratorOnClassConstructor3.js
@@ -48,8 +48,7 @@ var _0_2 = require("./0");
 var C = (function (_super) {
     __extends(C, _super);
     function C(prop) {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return C;
 }(_0_1.base));
diff --git a/tests/baselines/reference/derivedClassOverridesPrivateFunction1.js b/tests/baselines/reference/derivedClassOverridesPrivateFunction1.js
index a0b1559d430..981c072d47c 100644
--- a/tests/baselines/reference/derivedClassOverridesPrivateFunction1.js
+++ b/tests/baselines/reference/derivedClassOverridesPrivateFunction1.js
@@ -32,8 +32,7 @@ var BaseClass = (function () {
 var DerivedClass = (function (_super) {
     __extends(DerivedClass, _super);
     function DerivedClass() {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     DerivedClass.prototype._init = function () {
     };
diff --git a/tests/baselines/reference/derivedClassOverridesProtectedMembers.js b/tests/baselines/reference/derivedClassOverridesProtectedMembers.js
index e86806d31d2..b8997769eb7 100644
--- a/tests/baselines/reference/derivedClassOverridesProtectedMembers.js
+++ b/tests/baselines/reference/derivedClassOverridesProtectedMembers.js
@@ -66,8 +66,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived(a) {
-        var _this = _super.call(this, x) || this;
-        return _this;
+        return _super.call(this, x) || this;
     }
     Derived.prototype.b = function (a) { };
     Object.defineProperty(Derived.prototype, "c", {
diff --git a/tests/baselines/reference/derivedClassOverridesProtectedMembers2.js b/tests/baselines/reference/derivedClassOverridesProtectedMembers2.js
index 3035b2cb56f..ac9b401a45c 100644
--- a/tests/baselines/reference/derivedClassOverridesProtectedMembers2.js
+++ b/tests/baselines/reference/derivedClassOverridesProtectedMembers2.js
@@ -94,8 +94,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived(a) {
-        var _this = _super.call(this, a) || this;
-        return _this;
+        return _super.call(this, a) || this;
     }
     Derived.prototype.b = function (a) { };
     Object.defineProperty(Derived.prototype, "c", {
diff --git a/tests/baselines/reference/derivedClassOverridesProtectedMembers3.js b/tests/baselines/reference/derivedClassOverridesProtectedMembers3.js
index 0e0c1c1ff01..d0d9d8fa0f5 100644
--- a/tests/baselines/reference/derivedClassOverridesProtectedMembers3.js
+++ b/tests/baselines/reference/derivedClassOverridesProtectedMembers3.js
@@ -103,16 +103,14 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1(a) {
-        var _this = _super.call(this, a) || this;
-        return _this;
+        return _super.call(this, a) || this;
     }
     return Derived1;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2(a) {
-        var _this = _super.call(this, a) || this;
-        return _this;
+        return _super.call(this, a) || this;
     }
     Derived2.prototype.b = function (a) { };
     return Derived2;
@@ -120,8 +118,7 @@ var Derived2 = (function (_super) {
 var Derived3 = (function (_super) {
     __extends(Derived3, _super);
     function Derived3(a) {
-        var _this = _super.call(this, a) || this;
-        return _this;
+        return _super.call(this, a) || this;
     }
     Object.defineProperty(Derived3.prototype, "c", {
         get: function () { return x; },
@@ -133,8 +130,7 @@ var Derived3 = (function (_super) {
 var Derived4 = (function (_super) {
     __extends(Derived4, _super);
     function Derived4(a) {
-        var _this = _super.call(this, a) || this;
-        return _this;
+        return _super.call(this, a) || this;
     }
     Object.defineProperty(Derived4.prototype, "c", {
         set: function (v) { },
@@ -146,24 +142,21 @@ var Derived4 = (function (_super) {
 var Derived5 = (function (_super) {
     __extends(Derived5, _super);
     function Derived5(a) {
-        var _this = _super.call(this, a) || this;
-        return _this;
+        return _super.call(this, a) || this;
     }
     return Derived5;
 }(Base));
 var Derived6 = (function (_super) {
     __extends(Derived6, _super);
     function Derived6(a) {
-        var _this = _super.call(this, a) || this;
-        return _this;
+        return _super.call(this, a) || this;
     }
     return Derived6;
 }(Base));
 var Derived7 = (function (_super) {
     __extends(Derived7, _super);
     function Derived7(a) {
-        var _this = _super.call(this, a) || this;
-        return _this;
+        return _super.call(this, a) || this;
     }
     Derived7.s = function (a) { };
     return Derived7;
@@ -171,8 +164,7 @@ var Derived7 = (function (_super) {
 var Derived8 = (function (_super) {
     __extends(Derived8, _super);
     function Derived8(a) {
-        var _this = _super.call(this, a) || this;
-        return _this;
+        return _super.call(this, a) || this;
     }
     Object.defineProperty(Derived8, "t", {
         get: function () { return x; },
@@ -184,8 +176,7 @@ var Derived8 = (function (_super) {
 var Derived9 = (function (_super) {
     __extends(Derived9, _super);
     function Derived9(a) {
-        var _this = _super.call(this, a) || this;
-        return _this;
+        return _super.call(this, a) || this;
     }
     Object.defineProperty(Derived9, "t", {
         set: function (v) { },
@@ -197,8 +188,7 @@ var Derived9 = (function (_super) {
 var Derived10 = (function (_super) {
     __extends(Derived10, _super);
     function Derived10(a) {
-        var _this = _super.call(this, a) || this;
-        return _this;
+        return _super.call(this, a) || this;
     }
     return Derived10;
 }(Base));
diff --git a/tests/baselines/reference/derivedClassOverridesPublicMembers.js b/tests/baselines/reference/derivedClassOverridesPublicMembers.js
index 703f1d4a833..92fbc07e774 100644
--- a/tests/baselines/reference/derivedClassOverridesPublicMembers.js
+++ b/tests/baselines/reference/derivedClassOverridesPublicMembers.js
@@ -92,8 +92,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived(a) {
-        var _this = _super.call(this, x) || this;
-        return _this;
+        return _super.call(this, x) || this;
     }
     Derived.prototype.b = function (a) { };
     Object.defineProperty(Derived.prototype, "c", {
diff --git a/tests/baselines/reference/derivedClassSuperCallsWithThisArg.js b/tests/baselines/reference/derivedClassSuperCallsWithThisArg.js
index 039e25919f8..504d414a608 100644
--- a/tests/baselines/reference/derivedClassSuperCallsWithThisArg.js
+++ b/tests/baselines/reference/derivedClassSuperCallsWithThisArg.js
@@ -42,8 +42,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.call(this, _this) || this;
-        return _this;
+        return _super.call(this, _this) || this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/destructuringParameterDeclaration5.js b/tests/baselines/reference/destructuringParameterDeclaration5.js
index 8781671853f..7ba178823df 100644
--- a/tests/baselines/reference/destructuringParameterDeclaration5.js
+++ b/tests/baselines/reference/destructuringParameterDeclaration5.js
@@ -65,8 +65,7 @@ var Class = (function () {
 var SubClass = (function (_super) {
     __extends(SubClass, _super);
     function SubClass() {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return SubClass;
 }(Class));
@@ -78,8 +77,7 @@ var D = (function () {
 var SubD = (function (_super) {
     __extends(SubD, _super);
     function SubD() {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return SubD;
 }(D));
diff --git a/tests/baselines/reference/es6ClassTest2.js b/tests/baselines/reference/es6ClassTest2.js
index 9217f890377..b3787405ff7 100644
--- a/tests/baselines/reference/es6ClassTest2.js
+++ b/tests/baselines/reference/es6ClassTest2.js
@@ -267,8 +267,7 @@ var SuperParent = (function () {
 var SuperChild = (function (_super) {
     __extends(SuperChild, _super);
     function SuperChild() {
-        var _this = _super.call(this, 1) || this;
-        return _this;
+        return _super.call(this, 1) || this;
     }
     SuperChild.prototype.b = function () {
         _super.prototype.b.call(this, 'str');
diff --git a/tests/baselines/reference/genericClassPropertyInheritanceSpecialization.js b/tests/baselines/reference/genericClassPropertyInheritanceSpecialization.js
index 86410aaf10e..28eaf464968 100644
--- a/tests/baselines/reference/genericClassPropertyInheritanceSpecialization.js
+++ b/tests/baselines/reference/genericClassPropertyInheritanceSpecialization.js
@@ -109,8 +109,7 @@ var PortalFx;
                 var Validator = (function (_super) {
                     __extends(Validator, _super);
                     function Validator(message) {
-                        var _this = _super.call(this, message) || this;
-                        return _this;
+                        return _super.call(this, message) || this;
                     }
                     return Validator;
                 }(Portal.Controls.Validators.Validator));
diff --git a/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes.js b/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes.js
index 582937e7c0a..b0974c26ede 100644
--- a/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes.js
+++ b/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes.js
@@ -52,8 +52,7 @@ var EndGate;
         var NumberTween = (function (_super) {
             __extends(NumberTween, _super);
             function NumberTween(from) {
-                var _this = _super.call(this, from) || this;
-                return _this;
+                return _super.call(this, from) || this;
             }
             return NumberTween;
         }(Tweening.Tween));
diff --git a/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes2.js b/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes2.js
index 88173a4cbe3..a403c0de0b3 100644
--- a/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes2.js
+++ b/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes2.js
@@ -51,8 +51,7 @@ var EndGate;
         var NumberTween = (function (_super) {
             __extends(NumberTween, _super);
             function NumberTween(from) {
-                var _this = _super.call(this, from) || this;
-                return _this;
+                return _super.call(this, from) || this;
             }
             return NumberTween;
         }(Tweening.Tween));
diff --git a/tests/baselines/reference/genericTypeConstraints.js b/tests/baselines/reference/genericTypeConstraints.js
index b82e261a14f..67303166aa3 100644
--- a/tests/baselines/reference/genericTypeConstraints.js
+++ b/tests/baselines/reference/genericTypeConstraints.js
@@ -38,8 +38,7 @@ var Bar = (function () {
 var BarExtended = (function (_super) {
     __extends(BarExtended, _super);
     function BarExtended() {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return BarExtended;
 }(Bar));
diff --git a/tests/baselines/reference/missingPropertiesOfClassExpression.js b/tests/baselines/reference/missingPropertiesOfClassExpression.js
index 34b60940aa9..c7b30882b14 100644
--- a/tests/baselines/reference/missingPropertiesOfClassExpression.js
+++ b/tests/baselines/reference/missingPropertiesOfClassExpression.js
@@ -15,8 +15,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var George = (function (_super) {
     __extends(George, _super);
     function George() {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return George;
 }((function () {
diff --git a/tests/baselines/reference/optionalParamArgsTest.js b/tests/baselines/reference/optionalParamArgsTest.js
index 374b0956509..1b603898aa6 100644
--- a/tests/baselines/reference/optionalParamArgsTest.js
+++ b/tests/baselines/reference/optionalParamArgsTest.js
@@ -162,8 +162,7 @@ var C2 = (function (_super) {
     __extends(C2, _super);
     function C2(v2) {
         if (v2 === void 0) { v2 = 6; }
-        var _this = _super.call(this, v2) || this;
-        return _this;
+        return _super.call(this, v2) || this;
     }
     return C2;
 }(C1));
diff --git a/tests/baselines/reference/parserRealSource11.js b/tests/baselines/reference/parserRealSource11.js
index fd2c017b637..eb05d13f4ed 100644
--- a/tests/baselines/reference/parserRealSource11.js
+++ b/tests/baselines/reference/parserRealSource11.js
@@ -2667,8 +2667,7 @@ var TypeScript;
     var MissingIdentifier = (function (_super) {
         __extends(MissingIdentifier, _super);
         function MissingIdentifier() {
-            var _this = _super.call(this, "__missing") || this;
-            return _this;
+            return _super.call(this, "__missing") || this;
         }
         MissingIdentifier.prototype.isMissing = function () {
             return true;
@@ -2707,8 +2706,7 @@ var TypeScript;
     var Expression = (function (_super) {
         __extends(Expression, _super);
         function Expression(nodeType) {
-            var _this = _super.call(this, nodeType) || this;
-            return _this;
+            return _super.call(this, nodeType) || this;
         }
         Expression.prototype.isExpression = function () { return true; };
         Expression.prototype.isStatementOrExpression = function () { return true; };
@@ -3165,8 +3163,7 @@ var TypeScript;
     var ModuleElement = (function (_super) {
         __extends(ModuleElement, _super);
         function ModuleElement(nodeType) {
-            var _this = _super.call(this, nodeType) || this;
-            return _this;
+            return _super.call(this, nodeType) || this;
         }
         return ModuleElement;
     }(AST));
@@ -3259,8 +3256,7 @@ var TypeScript;
     var VarDecl = (function (_super) {
         __extends(VarDecl, _super);
         function VarDecl(id, nest) {
-            var _this = _super.call(this, id, NodeType.VarDecl, nest) || this;
-            return _this;
+            return _super.call(this, id, NodeType.VarDecl, nest) || this;
         }
         VarDecl.prototype.isAmbient = function () { return hasFlag(this.varFlags, VarFlags.Ambient); };
         VarDecl.prototype.isExported = function () { return hasFlag(this.varFlags, VarFlags.Exported); };
@@ -3597,8 +3593,7 @@ var TypeScript;
     var InterfaceDeclaration = (function (_super) {
         __extends(InterfaceDeclaration, _super);
         function InterfaceDeclaration(name, members, extendsList, implementsList) {
-            var _this = _super.call(this, NodeType.InterfaceDeclaration, name, extendsList, implementsList, members) || this;
-            return _this;
+            return _super.call(this, NodeType.InterfaceDeclaration, name, extendsList, implementsList, members) || this;
         }
         InterfaceDeclaration.prototype.typeCheck = function (typeFlow) {
             return typeFlow.typeCheckInterface(this);
@@ -3992,8 +3987,7 @@ var TypeScript;
     var EndCode = (function (_super) {
         __extends(EndCode, _super);
         function EndCode() {
-            var _this = _super.call(this, NodeType.EndCode) || this;
-            return _this;
+            return _super.call(this, NodeType.EndCode) || this;
         }
         return EndCode;
     }(AST));
@@ -4650,8 +4644,7 @@ var TypeScript;
     var DebuggerStatement = (function (_super) {
         __extends(DebuggerStatement, _super);
         function DebuggerStatement() {
-            var _this = _super.call(this, NodeType.Debugger) || this;
-            return _this;
+            return _super.call(this, NodeType.Debugger) || this;
         }
         DebuggerStatement.prototype.emit = function (emitter, tokenId, startLine) {
             emitter.emitParensAndCommentsInPlace(this, true);
diff --git a/tests/baselines/reference/parserharness.js b/tests/baselines/reference/parserharness.js
index 059ac2efd8e..14ce4338176 100644
--- a/tests/baselines/reference/parserharness.js
+++ b/tests/baselines/reference/parserharness.js
@@ -2471,8 +2471,7 @@ var Harness;
     var Run = (function (_super) {
         __extends(Run, _super);
         function Run() {
-            var _this = _super.call(this, 'Test Run', null) || this;
-            return _this;
+            return _super.call(this, 'Test Run', null) || this;
         }
         Run.prototype.run = function () {
             emitLog('start');
diff --git a/tests/baselines/reference/strictModeInConstructor.js b/tests/baselines/reference/strictModeInConstructor.js
index ecd6bacd20a..da45bda5c6e 100644
--- a/tests/baselines/reference/strictModeInConstructor.js
+++ b/tests/baselines/reference/strictModeInConstructor.js
@@ -107,8 +107,7 @@ var Bs = (function (_super) {
     __extends(Bs, _super);
     function Bs() {
         "use strict"; // No error
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return Bs;
 }(A));
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing2.js b/tests/baselines/reference/superCallBeforeThisAccessing2.js
index 91cc3d28dd6..7331718a9ed 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing2.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing2.js
@@ -24,8 +24,7 @@ var Base = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.call(this, function () { _this._t; }) || this;
-        return _this;
+        return _super.call(this, function () { _this._t; }) || this;
     }
     return D;
 }(Base));
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing6.js b/tests/baselines/reference/superCallBeforeThisAccessing6.js
index 4eb8e5266c2..e4dfb3f714a 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing6.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing6.js
@@ -24,8 +24,7 @@ var Base = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.call(this, _this) || this;
-        return _this;
+        return _super.call(this, this) || this;
     }
     return D;
 }(Base));
diff --git a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType1.js b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType1.js
index 27f3db51453..bc196299bf9 100644
--- a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType1.js
+++ b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType1.js
@@ -20,8 +20,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return D;
 }(B));
diff --git a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType2.js b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType2.js
index a8d5e8008ac..8a0ef085590 100644
--- a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType2.js
+++ b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType2.js
@@ -19,8 +19,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return D;
 }(B));
diff --git a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithIncorrectNumberOfTypeArguments1.js b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithIncorrectNumberOfTypeArguments1.js
index b12a3eef6d4..0529d5e3dc2 100644
--- a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithIncorrectNumberOfTypeArguments1.js
+++ b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithIncorrectNumberOfTypeArguments1.js
@@ -25,8 +25,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.call(this, function (value) { return String(value); }) || this;
-        return _this;
+        return _super.call(this, function (value) { return String(value); }) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithNoTypeArguments1.js b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithNoTypeArguments1.js
index c78e6693f16..fb08ec28902 100644
--- a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithNoTypeArguments1.js
+++ b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithNoTypeArguments1.js
@@ -25,8 +25,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.call(this, function (value) { return String(value); }) || this;
-        return _this;
+        return _super.call(this, function (value) { return String(value); }) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/superCallFromClassThatDerivesNonGenericTypeButWithTypeArguments1.js b/tests/baselines/reference/superCallFromClassThatDerivesNonGenericTypeButWithTypeArguments1.js
index 32d2065dd3f..50153391f62 100644
--- a/tests/baselines/reference/superCallFromClassThatDerivesNonGenericTypeButWithTypeArguments1.js
+++ b/tests/baselines/reference/superCallFromClassThatDerivesNonGenericTypeButWithTypeArguments1.js
@@ -25,8 +25,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.call(this, function (value) { return String(value); }) || this;
-        return _this;
+        return _super.call(this, function (value) { return String(value); }) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/superCallInsideClassDeclaration.js b/tests/baselines/reference/superCallInsideClassDeclaration.js
index b696b4a302f..05e44119608 100644
--- a/tests/baselines/reference/superCallInsideClassDeclaration.js
+++ b/tests/baselines/reference/superCallInsideClassDeclaration.js
@@ -39,8 +39,7 @@ var B = (function (_super) {
         var D = (function (_super) {
             __extends(D, _super);
             function D() {
-                var _this = _super.call(this) || this;
-                return _this;
+                return _super.call(this) || this;
             }
             return D;
         }(C));
diff --git a/tests/baselines/reference/superCallInsideClassExpression.js b/tests/baselines/reference/superCallInsideClassExpression.js
index 829311f237c..3d55fe11cff 100644
--- a/tests/baselines/reference/superCallInsideClassExpression.js
+++ b/tests/baselines/reference/superCallInsideClassExpression.js
@@ -39,8 +39,7 @@ var B = (function (_super) {
         var D = (function (_super) {
             __extends(class_1, _super);
             function class_1() {
-                var _this = _super.call(this) || this;
-                return _this;
+                return _super.call(this) || this;
             }
             return class_1;
         }(C));
diff --git a/tests/baselines/reference/superCallParameterContextualTyping1.js b/tests/baselines/reference/superCallParameterContextualTyping1.js
index 0fe27f493e8..d8491b4ee83 100644
--- a/tests/baselines/reference/superCallParameterContextualTyping1.js
+++ b/tests/baselines/reference/superCallParameterContextualTyping1.js
@@ -28,8 +28,7 @@ var B = (function (_super) {
     __extends(B, _super);
     // Ensure 'value' is of type 'number (and not '{}') by using its 'toExponential()' method.
     function B() {
-        var _this = _super.call(this, function (value) { return String(value.toExponential()); }) || this;
-        return _this;
+        return _super.call(this, function (value) { return String(value.toExponential()); }) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/superCallParameterContextualTyping2.js b/tests/baselines/reference/superCallParameterContextualTyping2.js
index f970be44aff..9868a7db124 100644
--- a/tests/baselines/reference/superCallParameterContextualTyping2.js
+++ b/tests/baselines/reference/superCallParameterContextualTyping2.js
@@ -27,8 +27,7 @@ var C = (function (_super) {
     __extends(C, _super);
     // Ensure 'value' is not of type 'any' by invoking it with type arguments.
     function C() {
-        var _this = _super.call(this, function (value) { return String(value()); }) || this;
-        return _this;
+        return _super.call(this, function (value) { return String(value()); }) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/superWithGenericSpecialization.js b/tests/baselines/reference/superWithGenericSpecialization.js
index 96303dab4ed..a0381d0b944 100644
--- a/tests/baselines/reference/superWithGenericSpecialization.js
+++ b/tests/baselines/reference/superWithGenericSpecialization.js
@@ -28,8 +28,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/superWithGenerics.js b/tests/baselines/reference/superWithGenerics.js
index 36b48554871..803f229bd4b 100644
--- a/tests/baselines/reference/superWithGenerics.js
+++ b/tests/baselines/reference/superWithGenerics.js
@@ -20,8 +20,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return D;
 }(B));
diff --git a/tests/baselines/reference/targetTypeBaseCalls.js b/tests/baselines/reference/targetTypeBaseCalls.js
index 8581526c1b6..cac93023a00 100644
--- a/tests/baselines/reference/targetTypeBaseCalls.js
+++ b/tests/baselines/reference/targetTypeBaseCalls.js
@@ -35,8 +35,7 @@ new Foo(function (s) { s = 5; }); // error, if types are applied correctly
 var Bar = (function (_super) {
     __extends(Bar, _super);
     function Bar() {
-        var _this = _super.call(this, function (s) { s = 5; }) || this;
-        return _this;
+        return _super.call(this, function (s) { s = 5; }) || this;
     }
     return Bar;
 }(Foo)); // error, if types are applied correctly
diff --git a/tests/baselines/reference/thisInInvalidContexts.js b/tests/baselines/reference/thisInInvalidContexts.js
index 7872aa121ed..7fcfaf9d317 100644
--- a/tests/baselines/reference/thisInInvalidContexts.js
+++ b/tests/baselines/reference/thisInInvalidContexts.js
@@ -70,8 +70,7 @@ var ClassWithNoInitializer = (function (_super) {
     __extends(ClassWithNoInitializer, _super);
     //'this' in optional super call
     function ClassWithNoInitializer() {
-        var _this = _super.call(this, _this) || this;
-        return _this;
+        return _super.call(this, _this) || this;
     }
     return ClassWithNoInitializer;
 }(BaseErrClass));
diff --git a/tests/baselines/reference/thisInInvalidContextsExternalModule.js b/tests/baselines/reference/thisInInvalidContextsExternalModule.js
index e656824ae66..546863b5216 100644
--- a/tests/baselines/reference/thisInInvalidContextsExternalModule.js
+++ b/tests/baselines/reference/thisInInvalidContextsExternalModule.js
@@ -71,8 +71,7 @@ var ClassWithNoInitializer = (function (_super) {
     __extends(ClassWithNoInitializer, _super);
     //'this' in optional super call
     function ClassWithNoInitializer() {
-        var _this = _super.call(this, _this) || this;
-        return _this;
+        return _super.call(this, _this) || this;
     }
     return ClassWithNoInitializer;
 }(BaseErrClass));
diff --git a/tests/baselines/reference/thisInSuperCall.js b/tests/baselines/reference/thisInSuperCall.js
index 1c1f11ffbc8..2a4d15973ab 100644
--- a/tests/baselines/reference/thisInSuperCall.js
+++ b/tests/baselines/reference/thisInSuperCall.js
@@ -36,8 +36,7 @@ var Base = (function () {
 var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo() {
-        var _this = _super.call(this, _this) || this;
-        return _this;
+        return _super.call(this, _this) || this;
     }
     return Foo;
 }(Base));
diff --git a/tests/baselines/reference/thisInSuperCall2.js b/tests/baselines/reference/thisInSuperCall2.js
index 6288082ed64..eabfa9d562c 100644
--- a/tests/baselines/reference/thisInSuperCall2.js
+++ b/tests/baselines/reference/thisInSuperCall2.js
@@ -33,8 +33,7 @@ var Base = (function () {
 var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo() {
-        var _this = _super.call(this, _this) || this;
-        return _this;
+        return _super.call(this, _this) || this;
     }
     return Foo;
 }(Base));
diff --git a/tests/baselines/reference/unknownSymbols1.js b/tests/baselines/reference/unknownSymbols1.js
index 5e2bb509a23..832868c4b8f 100644
--- a/tests/baselines/reference/unknownSymbols1.js
+++ b/tests/baselines/reference/unknownSymbols1.js
@@ -63,8 +63,7 @@ var C3 = (function () {
 var C4 = (function (_super) {
     __extends(C4, _super);
     function C4() {
-        var _this = _super.call(this, asdf) || this;
-        return _this;
+        return _super.call(this, asdf) || this;
     }
     return C4;
 }(C3));
diff --git a/tests/baselines/reference/validUseOfThisInSuper.js b/tests/baselines/reference/validUseOfThisInSuper.js
index bbd564db366..483e905b48a 100644
--- a/tests/baselines/reference/validUseOfThisInSuper.js
+++ b/tests/baselines/reference/validUseOfThisInSuper.js
@@ -24,8 +24,7 @@ var Base = (function () {
 var Super = (function (_super) {
     __extends(Super, _super);
     function Super() {
-        var _this = _super.call(this, (function () { return _this; })()) || this;
-        return _this;
+        return _super.call(this, (function () { return _this; })()) || this;
     }
     return Super;
 }(Base));