diff --git a/src/compiler/emitter.ts b/src/compiler/emitter.ts
index f3d1338d95..9ecc936e3c 100644
--- a/src/compiler/emitter.ts
+++ b/src/compiler/emitter.ts
@@ -2090,15 +2090,7 @@ module ts {
             // Create a temporary variable with a unique unused name. The forLoopVariable parameter signals that the
             // name should be one that is appropriate for a for loop variable.
             function createTempVariable(location: Node, forLoopVariable?: boolean): Identifier {
-                var name = forLoopVariable ? "_i" : undefined;
-                while (true) {
-                    if (name && !isExistingName(location, name)) {
-                        break;
-                    }
-                    // _a .. _h, _j ... _z, _0, _1, ...
-                    name = "_" + (tempCount < 25 ? String.fromCharCode(tempCount + (tempCount < 8 ? 0 : 1) + CharacterCodes.a) : tempCount - 25);
-                    tempCount++;
-                }
+                var name = generateUniqueNameForLocation(location, /*baseName*/ forLoopVariable ? "_i" : "_a");
                 var result = <Identifier>createSynthesizedNode(SyntaxKind.Identifier);
                 result.text = name;
                 return result;
diff --git a/tests/baselines/reference/callWithSpread.js b/tests/baselines/reference/callWithSpread.js
index d676c0f2a3..02b6b9b8ff 100644
--- a/tests/baselines/reference/callWithSpread.js
+++ b/tests/baselines/reference/callWithSpread.js
@@ -81,8 +81,8 @@ obj.foo.apply(obj, [1, 2].concat(a));
 obj.foo.apply(obj, [1, 2].concat(a, ["abc"]));
 xa[1].foo(1, 2, "abc");
 (_a = xa[1]).foo.apply(_a, [1, 2].concat(a));
-(_b = xa[1]).foo.apply(_b, [1, 2].concat(a, ["abc"]));
-(_c = xa[1]).foo.apply(_c, [1, 2, "abc"]);
+(_a_1 = xa[1]).foo.apply(_a_1, [1, 2].concat(a, ["abc"]));
+(_a_2 = xa[1]).foo.apply(_a_2, [1, 2, "abc"]);
 var C = (function () {
     function C(x, y) {
         var z = [];
@@ -114,4 +114,4 @@ var D = (function (_super) {
 })(C);
 // Only supported in when target is ES6
 var c = new C(1, 2, ...a);
-var _a, _b, _c;
+var _a, _a_1, _a_2;
diff --git a/tests/baselines/reference/collisionRestParameterArrowFunctions.js b/tests/baselines/reference/collisionRestParameterArrowFunctions.js
index 39d449555d..b70bb6c211 100644
--- a/tests/baselines/reference/collisionRestParameterArrowFunctions.js
+++ b/tests/baselines/reference/collisionRestParameterArrowFunctions.js
@@ -16,8 +16,8 @@ var f2NoError = () => {
 //// [collisionRestParameterArrowFunctions.js]
 var f1 = function (_i) {
     var restParameters = [];
-    for (var _a = 1; _a < arguments.length; _a++) {
-        restParameters[_a - 1] = arguments[_a];
+    for (var _i_1 = 1; _i_1 < arguments.length; _i_1++) {
+        restParameters[_i_1 - 1] = arguments[_i_1];
     }
     var _i = 10; // no error
 };
@@ -26,8 +26,8 @@ var f1NoError = function (_i) {
 };
 var f2 = function () {
     var restParameters = [];
-    for (var _a = 0; _a < arguments.length; _a++) {
-        restParameters[_a - 0] = arguments[_a];
+    for (var _i_1 = 0; _i_1 < arguments.length; _i_1++) {
+        restParameters[_i_1 - 0] = arguments[_i_1];
     }
     var _i = 10; // No Error
 };
diff --git a/tests/baselines/reference/collisionRestParameterClassConstructor.js b/tests/baselines/reference/collisionRestParameterClassConstructor.js
index fc6e400668..de3fd3c671 100644
--- a/tests/baselines/reference/collisionRestParameterClassConstructor.js
+++ b/tests/baselines/reference/collisionRestParameterClassConstructor.js
@@ -71,8 +71,8 @@ declare class c6NoError {
 var c1 = (function () {
     function c1(_i) {
         var restParameters = [];
-        for (var _a = 1; _a < arguments.length; _a++) {
-            restParameters[_a - 1] = arguments[_a];
+        for (var _i_1 = 1; _i_1 < arguments.length; _i_1++) {
+            restParameters[_i_1 - 1] = arguments[_i_1];
         }
         var _i = 10; // no error
     }
@@ -87,8 +87,8 @@ var c1NoError = (function () {
 var c2 = (function () {
     function c2() {
         var restParameters = [];
-        for (var _a = 0; _a < arguments.length; _a++) {
-            restParameters[_a - 0] = arguments[_a];
+        for (var _i_1 = 0; _i_1 < arguments.length; _i_1++) {
+            restParameters[_i_1 - 0] = arguments[_i_1];
         }
         var _i = 10; // no error
     }
@@ -103,8 +103,8 @@ var c2NoError = (function () {
 var c3 = (function () {
     function c3(_i) {
         var restParameters = [];
-        for (var _a = 1; _a < arguments.length; _a++) {
-            restParameters[_a - 1] = arguments[_a];
+        for (var _i_1 = 1; _i_1 < arguments.length; _i_1++) {
+            restParameters[_i_1 - 1] = arguments[_i_1];
         }
         this._i = _i;
         var _i = 10; // no error
@@ -121,8 +121,8 @@ var c3NoError = (function () {
 var c5 = (function () {
     function c5(_i) {
         var rest = [];
-        for (var _a = 1; _a < arguments.length; _a++) {
-            rest[_a - 1] = arguments[_a];
+        for (var _i_1 = 1; _i_1 < arguments.length; _i_1++) {
+            rest[_i_1 - 1] = arguments[_i_1];
         }
         var _i; // no error
     }
diff --git a/tests/baselines/reference/collisionRestParameterClassMethod.js b/tests/baselines/reference/collisionRestParameterClassMethod.js
index e3471c85f1..3478dda615 100644
--- a/tests/baselines/reference/collisionRestParameterClassMethod.js
+++ b/tests/baselines/reference/collisionRestParameterClassMethod.js
@@ -44,8 +44,8 @@ var c1 = (function () {
     }
     c1.prototype.foo = function (_i) {
         var restParameters = [];
-        for (var _a = 1; _a < arguments.length; _a++) {
-            restParameters[_a - 1] = arguments[_a];
+        for (var _i_1 = 1; _i_1 < arguments.length; _i_1++) {
+            restParameters[_i_1 - 1] = arguments[_i_1];
         }
         var _i = 10; // no error
     };
@@ -54,8 +54,8 @@ var c1 = (function () {
     };
     c1.prototype.f4 = function (_i) {
         var rest = [];
-        for (var _a = 1; _a < arguments.length; _a++) {
-            rest[_a - 1] = arguments[_a];
+        for (var _i_1 = 1; _i_1 < arguments.length; _i_1++) {
+            rest[_i_1 - 1] = arguments[_i_1];
         }
         var _i; // no error
     };
@@ -69,8 +69,8 @@ var c3 = (function () {
     }
     c3.prototype.foo = function () {
         var restParameters = [];
-        for (var _a = 0; _a < arguments.length; _a++) {
-            restParameters[_a - 0] = arguments[_a];
+        for (var _i_1 = 0; _i_1 < arguments.length; _i_1++) {
+            restParameters[_i_1 - 0] = arguments[_i_1];
         }
         var _i = 10; // no error
     };
diff --git a/tests/baselines/reference/collisionRestParameterFunction.js b/tests/baselines/reference/collisionRestParameterFunction.js
index 8660e8f5db..98c2b2296e 100644
--- a/tests/baselines/reference/collisionRestParameterFunction.js
+++ b/tests/baselines/reference/collisionRestParameterFunction.js
@@ -37,8 +37,8 @@ declare function f6(_i: string); // no codegen no error
 // Functions
 function f1(_i) {
     var restParameters = [];
-    for (var _a = 1; _a < arguments.length; _a++) {
-        restParameters[_a - 1] = arguments[_a];
+    for (var _i_1 = 1; _i_1 < arguments.length; _i_1++) {
+        restParameters[_i_1 - 1] = arguments[_i_1];
     }
     var _i = 10; // no error
 }
@@ -47,8 +47,8 @@ function f1NoError(_i) {
 }
 function f3() {
     var restParameters = [];
-    for (var _a = 0; _a < arguments.length; _a++) {
-        restParameters[_a - 0] = arguments[_a];
+    for (var _i_1 = 0; _i_1 < arguments.length; _i_1++) {
+        restParameters[_i_1 - 0] = arguments[_i_1];
     }
     var _i = 10; // no error
 }
@@ -57,8 +57,8 @@ function f3NoError() {
 }
 function f4(_i) {
     var rest = [];
-    for (var _a = 1; _a < arguments.length; _a++) {
-        rest[_a - 1] = arguments[_a];
+    for (var _i_1 = 1; _i_1 < arguments.length; _i_1++) {
+        rest[_i_1 - 1] = arguments[_i_1];
     }
 }
 function f4NoError(_i) {
diff --git a/tests/baselines/reference/collisionRestParameterFunctionExpressions.js b/tests/baselines/reference/collisionRestParameterFunctionExpressions.js
index 22709b087e..478446bd5e 100644
--- a/tests/baselines/reference/collisionRestParameterFunctionExpressions.js
+++ b/tests/baselines/reference/collisionRestParameterFunctionExpressions.js
@@ -28,8 +28,8 @@ function foo() {
 function foo() {
     function f1(_i) {
         var restParameters = [];
-        for (var _a = 1; _a < arguments.length; _a++) {
-            restParameters[_a - 1] = arguments[_a];
+        for (var _i_1 = 1; _i_1 < arguments.length; _i_1++) {
+            restParameters[_i_1 - 1] = arguments[_i_1];
         }
         var _i = 10; // no error
     }
@@ -38,8 +38,8 @@ function foo() {
     }
     function f3() {
         var restParameters = [];
-        for (var _a = 0; _a < arguments.length; _a++) {
-            restParameters[_a - 0] = arguments[_a];
+        for (var _i_1 = 0; _i_1 < arguments.length; _i_1++) {
+            restParameters[_i_1 - 0] = arguments[_i_1];
         }
         var _i = 10; // no error
     }
@@ -48,8 +48,8 @@ function foo() {
     }
     function f4(_i) {
         var rest = [];
-        for (var _a = 1; _a < arguments.length; _a++) {
-            rest[_a - 1] = arguments[_a];
+        for (var _i_1 = 1; _i_1 < arguments.length; _i_1++) {
+            rest[_i_1 - 1] = arguments[_i_1];
         }
     }
     function f4NoError(_i) {
diff --git a/tests/baselines/reference/collisionRestParameterUnderscoreIUsage.js b/tests/baselines/reference/collisionRestParameterUnderscoreIUsage.js
index adc9c09de2..9316dba316 100644
--- a/tests/baselines/reference/collisionRestParameterUnderscoreIUsage.js
+++ b/tests/baselines/reference/collisionRestParameterUnderscoreIUsage.js
@@ -13,8 +13,8 @@ var _i = "This is what I'd expect to see";
 var Foo = (function () {
     function Foo() {
         var args = [];
-        for (var _a = 0; _a < arguments.length; _a++) {
-            args[_a - 0] = arguments[_a];
+        for (var _i_1 = 0; _i_1 < arguments.length; _i_1++) {
+            args[_i_1 - 0] = arguments[_i_1];
         }
         console.log(_i); // This should result in error
     }
diff --git a/tests/baselines/reference/computedPropertyNames48_ES5.js b/tests/baselines/reference/computedPropertyNames48_ES5.js
index c5ca0d5b24..d14faab73e 100644
--- a/tests/baselines/reference/computedPropertyNames48_ES5.js
+++ b/tests/baselines/reference/computedPropertyNames48_ES5.js
@@ -26,10 +26,10 @@ var a;
 extractIndexer((_a = {},
     _a[a] = "",
     _a)); // Should return string
-extractIndexer((_b = {},
-    _b[0 /* x */] = "",
-    _b)); // Should return string
-extractIndexer((_c = {},
-    _c["" || 0] = "",
-    _c)); // Should return any (widened form of undefined)
-var _a, _b, _c;
+extractIndexer((_a_1 = {},
+    _a_1[0 /* x */] = "",
+    _a_1)); // Should return string
+extractIndexer((_a_2 = {},
+    _a_2["" || 0] = "",
+    _a_2)); // Should return any (widened form of undefined)
+var _a, _a_1, _a_2;
diff --git a/tests/baselines/reference/declarationWithNoInitializer.js b/tests/baselines/reference/declarationWithNoInitializer.js
index 54d89368fb..ebe8f8b3b3 100644
--- a/tests/baselines/reference/declarationWithNoInitializer.js
+++ b/tests/baselines/reference/declarationWithNoInitializer.js
@@ -5,4 +5,4 @@ var {c, d};          // Error, no initializer
 
 //// [declarationWithNoInitializer.js]
 var _a = void 0, a = _a[0], b = _a[1]; // Error, no initializer
-var _b = void 0, c = _b.c, d = _b.d; // Error, no initializer
+var _a_1 = void 0, c = _a_1.c, d = _a_1.d; // Error, no initializer
diff --git a/tests/baselines/reference/declarationsAndAssignments.js b/tests/baselines/reference/declarationsAndAssignments.js
index 032f4cb0e6..3e67309663 100644
--- a/tests/baselines/reference/declarationsAndAssignments.js
+++ b/tests/baselines/reference/declarationsAndAssignments.js
@@ -184,9 +184,9 @@ function f21() {
 function f0() {
     var _a = [1, "hello"];
     var x = ([1, "hello"])[0];
-    var _b = [1, "hello"], x = _b[0], y = _b[1];
-    var _c = [1, "hello"], x = _c[0], y = _c[1], z = _c[2]; // Error
-    var _d = [0, 1, 2], z = _d[2];
+    var _a_1 = [1, "hello"], x = _a_1[0], y = _a_1[1];
+    var _a_2 = [1, "hello"], x = _a_2[0], y = _a_2[1], z = _a_2[2]; // Error
+    var _a_3 = [0, 1, 2], z = _a_3[2];
     var x;
     var y;
 }
@@ -203,60 +203,60 @@ function f2() {
     var _a = { x: 5, y: "hello" };
     var x = ({ x: 5, y: "hello" }).x;
     var y = ({ x: 5, y: "hello" }).y;
-    var _b = { x: 5, y: "hello" }, x = _b.x, y = _b.y;
+    var _a_1 = { x: 5, y: "hello" }, x = _a_1.x, y = _a_1.y;
     var x;
     var y;
     var a = ({ x: 5, y: "hello" }).x;
     var b = ({ x: 5, y: "hello" }).y;
-    var _c = { x: 5, y: "hello" }, a = _c.x, b = _c.y;
+    var _a_2 = { x: 5, y: "hello" }, a = _a_2.x, b = _a_2.y;
     var a;
     var b;
 }
 function f3() {
-    var _a = [1, ["hello", [true]]], x = _a[0], _b = _a[1], y = _b[0], z = _b[1][0];
+    var _a = [1, ["hello", [true]]], x = _a[0], _a_1 = _a[1], y = _a_1[0], z = _a_1[1][0];
     var x;
     var y;
     var z;
 }
 function f4() {
-    var _a = { a: 1, b: { a: "hello", b: { a: true } } }, x = _a.a, _b = _a.b, y = _b.a, z = _b.b.a;
+    var _a = { a: 1, b: { a: "hello", b: { a: true } } }, x = _a.a, _a_1 = _a.b, y = _a_1.a, z = _a_1.b.a;
     var x;
     var y;
     var z;
 }
 function f6() {
-    var _a = [1, "hello"], _b = _a[0], x = _b === void 0 ? 0 : _b, _c = _a[1], y = _c === void 0 ? "" : _c;
+    var _a = [1, "hello"], _a_1 = _a[0], x = _a_1 === void 0 ? 0 : _a_1, _a_2 = _a[1], y = _a_2 === void 0 ? "" : _a_2;
     var x;
     var y;
 }
 function f7() {
-    var _a = [1, "hello"], _b = _a[0], x = _b === void 0 ? 0 : _b, _c = _a[1], y = _c === void 0 ? 1 : _c; // Error, initializer for y must be string
+    var _a = [1, "hello"], _a_1 = _a[0], x = _a_1 === void 0 ? 0 : _a_1, _a_2 = _a[1], y = _a_2 === void 0 ? 1 : _a_2; // Error, initializer for y must be string
     var x;
     var y;
 }
 function f8() {
     var _a = [], a = _a[0], b = _a[1], c = _a[2]; // Ok, [] is an array
-    var _b = [1], d = _b[0], e = _b[1], f = _b[2]; // Error, [1] is a tuple
+    var _a_1 = [1], d = _a_1[0], e = _a_1[1], f = _a_1[2]; // Error, [1] is a tuple
 }
 function f9() {
     var _a = {}, a = _a[0], b = _a[1]; // Error, not array type
-    var _b = { 0: 10, 1: 20 }, c = _b[0], d = _b[1]; // Error, not array type
-    var _c = [10, 20], e = _c[0], f = _c[1];
+    var _a_1 = { 0: 10, 1: 20 }, c = _a_1[0], d = _a_1[1]; // Error, not array type
+    var _a_2 = [10, 20], e = _a_2[0], f = _a_2[1];
 }
 function f10() {
     var _a = {}, a = _a.a, b = _a.b; // Error
-    var _b = [], a = _b.a, b = _b.b; // Error
+    var _a_1 = [], a = _a_1.a, b = _a_1.b; // Error
 }
 function f11() {
     var _a = { x: 10, y: "hello" }, a = _a.x, b = _a.y;
-    var _b = { 0: 10, 1: "hello" }, a = _b[0], b = _b[1];
-    var _c = { "<": 10, ">": "hello" }, a = _c["<"], b = _c[">"];
-    var _d = [10, "hello"], a = _d[0], b = _d[1];
+    var _a_1 = { 0: 10, 1: "hello" }, a = _a_1[0], b = _a_1[1];
+    var _a_2 = { "<": 10, ">": "hello" }, a = _a_2["<"], b = _a_2[">"];
+    var _a_3 = [10, "hello"], a = _a_3[0], b = _a_3[1];
     var a;
     var b;
 }
 function f12() {
-    var _a = [1, ["hello", { x: 5, y: true }]], a = _a[0], _b = _a[1], _c = _b === void 0 ? ["abc", { x: 10, y: false }] : _b, b = _c[0], _d = _c[1], x = _d.x, c = _d.y;
+    var _a = [1, ["hello", { x: 5, y: true }]], a = _a[0], _a_1 = _a[1], _a_2 = _a_1 === void 0 ? ["abc", { x: 10, y: false }] : _a_1, b = _a_2[0], _a_3 = _a_2[1], x = _a_3.x, c = _a_3.y;
     var a;
     var b;
     var x;
@@ -264,10 +264,10 @@ function f12() {
 }
 function f13() {
     var _a = [1, "hello"], x = _a[0], y = _a[1];
-    var _b = [[x, y], { x: x, y: y }], a = _b[0], b = _b[1];
+    var _a_1 = [[x, y], { x: x, y: y }], a = _a_1[0], b = _a_1[1];
 }
 function f14(_a) {
-    var _b = _a[0], a = _b === void 0 ? 1 : _b, _c = _a[1], _d = _c[0], b = _d === void 0 ? "hello" : _d, _e = _c[1], x = _e.x, _f = _e.y, c = _f === void 0 ? false : _f;
+    var _a_1 = _a[0], a = _a_1 === void 0 ? 1 : _a_1, _a_2 = _a[1], _a_3 = _a_2[0], b = _a_3 === void 0 ? "hello" : _a_3, _a_4 = _a_2[1], x = _a_4.x, _a_5 = _a_4.y, c = _a_5 === void 0 ? false : _a_5;
     var a;
     var b;
     var c;
@@ -290,7 +290,7 @@ function f16() {
     var _a = f15(), a = _a.a, b = _a.b, c = _a.c;
 }
 function f17(_a) {
-    var _b = _a.a, a = _b === void 0 ? "" : _b, _c = _a.b, b = _c === void 0 ? 0 : _c, _d = _a.c, c = _d === void 0 ? false : _d;
+    var _a_1 = _a.a, a = _a_1 === void 0 ? "" : _a_1, _a_2 = _a.b, b = _a_2 === void 0 ? 0 : _a_2, _a_3 = _a.c, c = _a_3 === void 0 ? false : _a_3;
 }
 f17({});
 f17({ a: "hello" });
@@ -301,20 +301,20 @@ function f18() {
     var b;
     var aa;
     (_a = { a: a, b: b }, a = _a.a, b = _a.b, _a);
-    (_b = { b: b, a: a }, a = _b.a, b = _b.b, _b);
-    _c = [a, b], aa[0] = _c[0], b = _c[1];
-    _d = [b, a], a = _d[0], b = _d[1]; // Error
-    _e = [2, "def"], _f = _e[0], a = _f === void 0 ? 1 : _f, _g = _e[1], b = _g === void 0 ? "abc" : _g;
-    var _a, _b, _c, _d, _e, _f, _g;
+    (_a_1 = { b: b, a: a }, a = _a_1.a, b = _a_1.b, _a_1);
+    _a_2 = [a, b], aa[0] = _a_2[0], b = _a_2[1];
+    _a_3 = [b, a], a = _a_3[0], b = _a_3[1]; // Error
+    _a_4 = [2, "def"], _a_5 = _a_4[0], a = _a_5 === void 0 ? 1 : _a_5, _a_6 = _a_4[1], b = _a_6 === void 0 ? "abc" : _a_6;
+    var _a, _a_1, _a_2, _a_3, _a_4, _a_5, _a_6;
 }
 function f19() {
     var a, b;
     _a = [1, 2], a = _a[0], b = _a[1];
-    _b = [b, a], a = _b[0], b = _b[1];
-    (_c = { b: b, a: a }, a = _c.a, b = _c.b, _c);
-    _d = ([[2, 3]])[0], _e = _d === void 0 ? [1, 2] : _d, a = _e[0], b = _e[1];
-    var x = (_f = [1, 2], a = _f[0], b = _f[1], _f);
-    var _a, _b, _c, _d, _e, _f;
+    _a_1 = [b, a], a = _a_1[0], b = _a_1[1];
+    (_a_2 = { b: b, a: a }, a = _a_2.a, b = _a_2.b, _a_2);
+    _a_3 = ([[2, 3]])[0], _a_4 = _a_3 === void 0 ? [1, 2] : _a_3, a = _a_4[0], b = _a_4[1];
+    var x = (_a_5 = [1, 2], a = _a_5[0], b = _a_5[1], _a_5);
+    var _a, _a_1, _a_2, _a_3, _a_4, _a_5;
 }
 function f20() {
     var a;
@@ -322,14 +322,14 @@ function f20() {
     var y;
     var z;
     var _a = [1, 2, 3], a = _a.slice(0);
-    var _b = [1, 2, 3], x = _b[0], a = _b.slice(1);
-    var _c = [1, 2, 3], x = _c[0], y = _c[1], a = _c.slice(2);
-    var _d = [1, 2, 3], x = _d[0], y = _d[1], z = _d[2], a = _d.slice(3);
-    _e = [1, 2, 3], a = _e.slice(0);
-    _f = [1, 2, 3], x = _f[0], a = _f.slice(1);
-    _g = [1, 2, 3], x = _g[0], y = _g[1], a = _g.slice(2);
-    _h = [1, 2, 3], x = _h[0], y = _h[1], z = _h[2], a = _h.slice(3);
-    var _e, _f, _g, _h;
+    var _a_1 = [1, 2, 3], x = _a_1[0], a = _a_1.slice(1);
+    var _a_2 = [1, 2, 3], x = _a_2[0], y = _a_2[1], a = _a_2.slice(2);
+    var _a_3 = [1, 2, 3], x = _a_3[0], y = _a_3[1], z = _a_3[2], a = _a_3.slice(3);
+    _a_4 = [1, 2, 3], a = _a_4.slice(0);
+    _a_5 = [1, 2, 3], x = _a_5[0], a = _a_5.slice(1);
+    _a_6 = [1, 2, 3], x = _a_6[0], y = _a_6[1], a = _a_6.slice(2);
+    _a_7 = [1, 2, 3], x = _a_7[0], y = _a_7[1], z = _a_7[2], a = _a_7.slice(3);
+    var _a_4, _a_5, _a_6, _a_7;
 }
 function f21() {
     var a;
@@ -337,12 +337,12 @@ function f21() {
     var y;
     var z;
     var _a = [1, "hello", true], a = _a.slice(0);
-    var _b = [1, "hello", true], x = _b[0], a = _b.slice(1);
-    var _c = [1, "hello", true], x = _c[0], y = _c[1], a = _c.slice(2);
-    var _d = [1, "hello", true], x = _d[0], y = _d[1], z = _d[2], a = _d.slice(3);
-    _e = [1, "hello", true], a = _e.slice(0);
-    _f = [1, "hello", true], x = _f[0], a = _f.slice(1);
-    _g = [1, "hello", true], x = _g[0], y = _g[1], a = _g.slice(2);
-    _h = [1, "hello", true], x = _h[0], y = _h[1], z = _h[2], a = _h.slice(3);
-    var _e, _f, _g, _h;
+    var _a_1 = [1, "hello", true], x = _a_1[0], a = _a_1.slice(1);
+    var _a_2 = [1, "hello", true], x = _a_2[0], y = _a_2[1], a = _a_2.slice(2);
+    var _a_3 = [1, "hello", true], x = _a_3[0], y = _a_3[1], z = _a_3[2], a = _a_3.slice(3);
+    _a_4 = [1, "hello", true], a = _a_4.slice(0);
+    _a_5 = [1, "hello", true], x = _a_5[0], a = _a_5.slice(1);
+    _a_6 = [1, "hello", true], x = _a_6[0], y = _a_6[1], a = _a_6.slice(2);
+    _a_7 = [1, "hello", true], x = _a_7[0], y = _a_7[1], z = _a_7[2], a = _a_7.slice(3);
+    var _a_4, _a_5, _a_6, _a_7;
 }
diff --git a/tests/baselines/reference/destructuringParameterProperties1.js b/tests/baselines/reference/destructuringParameterProperties1.js
index cc16cc78de..5842d68b60 100644
--- a/tests/baselines/reference/destructuringParameterProperties1.js
+++ b/tests/baselines/reference/destructuringParameterProperties1.js
@@ -58,4 +58,4 @@ var c2 = new C2(["10", 10, !!10]);
 var _a = [c2.x, c2.y, c2.z], c2_x = _a[0], c2_y = _a[1], c2_z = _a[2];
 var c3 = new C3({ x: 0, y: "", z: false });
 c3 = new C3({ x: 0, "y": "y", z: true });
-var _b = [c3.x, c3.y, c3.z], c3_x = _b[0], c3_y = _b[1], c3_z = _b[2];
+var _a_1 = [c3.x, c3.y, c3.z], c3_x = _a_1[0], c3_y = _a_1[1], c3_z = _a_1[2];
diff --git a/tests/baselines/reference/destructuringParameterProperties2.js b/tests/baselines/reference/destructuringParameterProperties2.js
index 27e190af62..75b00d2ddf 100644
--- a/tests/baselines/reference/destructuringParameterProperties2.js
+++ b/tests/baselines/reference/destructuringParameterProperties2.js
@@ -53,6 +53,6 @@ var C1 = (function () {
 var x = new C1(undefined, [0, undefined, ""]);
 var _a = [x.getA(), x.getB(), x.getC()], x_a = _a[0], x_b = _a[1], x_c = _a[2];
 var y = new C1(10, [0, "", true]);
-var _b = [y.getA(), y.getB(), y.getC()], y_a = _b[0], y_b = _b[1], y_c = _b[2];
+var _a_1 = [y.getA(), y.getB(), y.getC()], y_a = _a_1[0], y_b = _a_1[1], y_c = _a_1[2];
 var z = new C1(10, [undefined, "", null]);
-var _c = [z.getA(), z.getB(), z.getC()], z_a = _c[0], z_b = _c[1], z_c = _c[2];
+var _a_2 = [z.getA(), z.getB(), z.getC()], z_a = _a_2[0], z_b = _a_2[1], z_c = _a_2[2];
diff --git a/tests/baselines/reference/destructuringParameterProperties3.js b/tests/baselines/reference/destructuringParameterProperties3.js
index fe9e69d7e5..be835bdfe2 100644
--- a/tests/baselines/reference/destructuringParameterProperties3.js
+++ b/tests/baselines/reference/destructuringParameterProperties3.js
@@ -56,8 +56,8 @@ var C1 = (function () {
 var x = new C1(undefined, [0, true, ""]);
 var _a = [x.getA(), x.getB(), x.getC()], x_a = _a[0], x_b = _a[1], x_c = _a[2];
 var y = new C1(10, [0, true, true]);
-var _b = [y.getA(), y.getB(), y.getC()], y_a = _b[0], y_b = _b[1], y_c = _b[2];
+var _a_1 = [y.getA(), y.getB(), y.getC()], y_a = _a_1[0], y_b = _a_1[1], y_c = _a_1[2];
 var z = new C1(10, [undefined, "", ""]);
-var _c = [z.getA(), z.getB(), z.getC()], z_a = _c[0], z_b = _c[1], z_c = _c[2];
+var _a_2 = [z.getA(), z.getB(), z.getC()], z_a = _a_2[0], z_b = _a_2[1], z_c = _a_2[2];
 var w = new C1(10, [undefined, undefined, undefined]);
-var _d = [z.getA(), z.getB(), z.getC()], z_a = _d[0], z_b = _d[1], z_c = _d[2];
+var _a_3 = [z.getA(), z.getB(), z.getC()], z_a = _a_3[0], z_b = _a_3[1], z_c = _a_3[2];
diff --git a/tests/baselines/reference/destructuringParameterProperties5.js b/tests/baselines/reference/destructuringParameterProperties5.js
index d9b1710ae8..5046d41472 100644
--- a/tests/baselines/reference/destructuringParameterProperties5.js
+++ b/tests/baselines/reference/destructuringParameterProperties5.js
@@ -15,7 +15,7 @@ var [a_x1, a_x2, a_x3, a_y, a_z] = [a.x1, a.x2, a.x3, a.y, a.z];
 //// [destructuringParameterProperties5.js]
 var C1 = (function () {
     function C1(_a) {
-        var _b = _a[0], x1 = _b.x1, x2 = _b.x2, x3 = _b.x3, y = _a[1], z = _a[2];
+        var _a_1 = _a[0], x1 = _a_1.x1, x2 = _a_1.x2, x3 = _a_1.x3, y = _a[1], z = _a[2];
         this.[{ x1, x2, x3 }, y, z] = [{ x1, x2, x3 }, y, z];
         var foo = x1 || x2 || x3 || y || z;
         var bar = this.x1 || this.x2 || this.x3 || this.y || this.z;
diff --git a/tests/baselines/reference/restElementMustBeLast.js b/tests/baselines/reference/restElementMustBeLast.js
index 337cb6de6f..9cb96b7e1e 100644
--- a/tests/baselines/reference/restElementMustBeLast.js
+++ b/tests/baselines/reference/restElementMustBeLast.js
@@ -5,5 +5,5 @@ var [...a, x] = [1, 2, 3];  // Error, rest must be last element
 
 //// [restElementMustBeLast.js]
 var _a = [1, 2, 3], x = _a[1]; // Error, rest must be last element
-_b = [1, 2, 3], x = _b[1]; // Error, rest must be last element
-var _b;
+_a_1 = [1, 2, 3], x = _a_1[1]; // Error, rest must be last element
+var _a_1;
diff --git a/tests/baselines/reference/restElementWithNullInitializer.js b/tests/baselines/reference/restElementWithNullInitializer.js
index 9f326602fb..9b314a5ed1 100644
--- a/tests/baselines/reference/restElementWithNullInitializer.js
+++ b/tests/baselines/reference/restElementWithNullInitializer.js
@@ -14,14 +14,14 @@ function foo4([...r] = []) {
 
 //// [restElementWithNullInitializer.js]
 function foo1(_a) {
-    var _b = _a === void 0 ? null : _a, r = _b.slice(0);
+    var _a_1 = _a === void 0 ? null : _a, r = _a_1.slice(0);
 }
 function foo2(_a) {
-    var _b = _a === void 0 ? undefined : _a, r = _b.slice(0);
+    var _a_1 = _a === void 0 ? undefined : _a, r = _a_1.slice(0);
 }
 function foo3(_a) {
-    var _b = _a === void 0 ? {} : _a, r = _b.slice(0);
+    var _a_1 = _a === void 0 ? {} : _a, r = _a_1.slice(0);
 }
 function foo4(_a) {
-    var _b = _a === void 0 ? [] : _a, r = _b.slice(0);
+    var _a_1 = _a === void 0 ? [] : _a, r = _a_1.slice(0);
 }
diff --git a/tests/baselines/reference/taggedTemplateStringsTypeArgumentInference.js b/tests/baselines/reference/taggedTemplateStringsTypeArgumentInference.js
index 9d3531c266..fad2c81f0e 100644
--- a/tests/baselines/reference/taggedTemplateStringsTypeArgumentInference.js
+++ b/tests/baselines/reference/taggedTemplateStringsTypeArgumentInference.js
@@ -99,62 +99,62 @@ function noParams(n) { }
 (_a = [""], _a.raw = [""], noParams(_a));
 // Generic tag with parameter which does not use type parameter
 function noGenericParams(n) { }
-(_b = [""], _b.raw = [""], noGenericParams(_b));
+(_a_1 = [""], _a_1.raw = [""], noGenericParams(_a_1));
 // Generic tag with multiple type parameters and only one used in parameter type annotation
 function someGenerics1a(n, m) { }
-(_c = ["", ""], _c.raw = ["", ""], someGenerics1a(_c, 3));
+(_a_2 = ["", ""], _a_2.raw = ["", ""], someGenerics1a(_a_2, 3));
 function someGenerics1b(n, m) { }
-(_d = ["", ""], _d.raw = ["", ""], someGenerics1b(_d, 3));
+(_a_3 = ["", ""], _a_3.raw = ["", ""], someGenerics1b(_a_3, 3));
 // Generic tag with argument of function type whose parameter is of type parameter type
 function someGenerics2a(strs, n) { }
-(_e = ["", ""], _e.raw = ["", ""], someGenerics2a(_e, function (n) { return n; }));
+(_a_4 = ["", ""], _a_4.raw = ["", ""], someGenerics2a(_a_4, function (n) { return n; }));
 function someGenerics2b(strs, n) { }
-(_f = ["", ""], _f.raw = ["", ""], someGenerics2b(_f, function (n, x) { return n; }));
+(_a_5 = ["", ""], _a_5.raw = ["", ""], someGenerics2b(_a_5, function (n, x) { return n; }));
 // Generic tag with argument of function type whose parameter is not of type parameter type but body/return type uses type parameter
 function someGenerics3(strs, producer) { }
-(_g = ["", ""], _g.raw = ["", ""], someGenerics3(_g, function () { return ''; }));
-(_h = ["", ""], _h.raw = ["", ""], someGenerics3(_h, function () { return undefined; }));
-(_j = ["", ""], _j.raw = ["", ""], someGenerics3(_j, function () { return 3; }));
+(_a_6 = ["", ""], _a_6.raw = ["", ""], someGenerics3(_a_6, function () { return ''; }));
+(_a_7 = ["", ""], _a_7.raw = ["", ""], someGenerics3(_a_7, function () { return undefined; }));
+(_a_8 = ["", ""], _a_8.raw = ["", ""], someGenerics3(_a_8, function () { return 3; }));
 // 2 parameter generic tag with argument 1 of type parameter type and argument 2 of function type whose parameter is of type parameter type
 function someGenerics4(strs, n, f) { }
-(_k = ["", "", ""], _k.raw = ["", "", ""], someGenerics4(_k, 4, function () { return null; }));
-(_l = ["", "", ""], _l.raw = ["", "", ""], someGenerics4(_l, '', function () { return 3; }));
-(_m = ["", "", ""], _m.raw = ["", "", ""], someGenerics4(_m, null, null));
+(_a_9 = ["", "", ""], _a_9.raw = ["", "", ""], someGenerics4(_a_9, 4, function () { return null; }));
+(_a_10 = ["", "", ""], _a_10.raw = ["", "", ""], someGenerics4(_a_10, '', function () { return 3; }));
+(_a_11 = ["", "", ""], _a_11.raw = ["", "", ""], someGenerics4(_a_11, null, null));
 // 2 parameter generic tag with argument 2 of type parameter type and argument 1 of function type whose parameter is of type parameter type
 function someGenerics5(strs, n, f) { }
-(_n = ["", " ", ""], _n.raw = ["", " ", ""], someGenerics5(_n, 4, function () { return null; }));
-(_o = ["", "", ""], _o.raw = ["", "", ""], someGenerics5(_o, '', function () { return 3; }));
-(_p = ["", "", ""], _p.raw = ["", "", ""], someGenerics5(_p, null, null));
+(_a_12 = ["", " ", ""], _a_12.raw = ["", " ", ""], someGenerics5(_a_12, 4, function () { return null; }));
+(_a_13 = ["", "", ""], _a_13.raw = ["", "", ""], someGenerics5(_a_13, '', function () { return 3; }));
+(_a_14 = ["", "", ""], _a_14.raw = ["", "", ""], someGenerics5(_a_14, null, null));
 // Generic tag with multiple arguments of function types that each have parameters of the same generic type
 function someGenerics6(strs, a, b, c) { }
-(_q = ["", "", "", ""], _q.raw = ["", "", "", ""], someGenerics6(_q, function (n) { return n; }, function (n) { return n; }, function (n) { return n; }));
-(_r = ["", "", "", ""], _r.raw = ["", "", "", ""], someGenerics6(_r, function (n) { return n; }, function (n) { return n; }, function (n) { return n; }));
-(_s = ["", "", "", ""], _s.raw = ["", "", "", ""], someGenerics6(_s, function (n) { return n; }, function (n) { return n; }, function (n) { return n; }));
+(_a_15 = ["", "", "", ""], _a_15.raw = ["", "", "", ""], someGenerics6(_a_15, function (n) { return n; }, function (n) { return n; }, function (n) { return n; }));
+(_a_16 = ["", "", "", ""], _a_16.raw = ["", "", "", ""], someGenerics6(_a_16, function (n) { return n; }, function (n) { return n; }, function (n) { return n; }));
+(_a_17 = ["", "", "", ""], _a_17.raw = ["", "", "", ""], someGenerics6(_a_17, function (n) { return n; }, function (n) { return n; }, function (n) { return n; }));
 // Generic tag with multiple arguments of function types that each have parameters of different generic type
 function someGenerics7(strs, a, b, c) { }
-(_t = ["", "", "", ""], _t.raw = ["", "", "", ""], someGenerics7(_t, function (n) { return n; }, function (n) { return n; }, function (n) { return n; }));
-(_u = ["", "", "", ""], _u.raw = ["", "", "", ""], someGenerics7(_u, function (n) { return n; }, function (n) { return n; }, function (n) { return n; }));
-(_v = ["", "", "", ""], _v.raw = ["", "", "", ""], someGenerics7(_v, function (n) { return n; }, function (n) { return n; }, function (n) { return n; }));
+(_a_18 = ["", "", "", ""], _a_18.raw = ["", "", "", ""], someGenerics7(_a_18, function (n) { return n; }, function (n) { return n; }, function (n) { return n; }));
+(_a_19 = ["", "", "", ""], _a_19.raw = ["", "", "", ""], someGenerics7(_a_19, function (n) { return n; }, function (n) { return n; }, function (n) { return n; }));
+(_a_20 = ["", "", "", ""], _a_20.raw = ["", "", "", ""], someGenerics7(_a_20, function (n) { return n; }, function (n) { return n; }, function (n) { return n; }));
 // Generic tag with argument of generic function type
 function someGenerics8(strs, n) { return n; }
-var x = (_w = ["", ""], _w.raw = ["", ""], someGenerics8(_w, someGenerics7));
-(_x = ["", "", "", ""], _x.raw = ["", "", "", ""], x(_x, null, null, null));
+var x = (_a_21 = ["", ""], _a_21.raw = ["", ""], someGenerics8(_a_21, someGenerics7));
+(_a_22 = ["", "", "", ""], _a_22.raw = ["", "", "", ""], x(_a_22, null, null, null));
 // Generic tag with multiple parameters of generic type passed arguments with no best common type
 function someGenerics9(strs, a, b, c) {
     return null;
 }
-var a9a = (_y = ["", "", "", ""], _y.raw = ["", "", "", ""], someGenerics9(_y, '', 0, []));
+var a9a = (_a_23 = ["", "", "", ""], _a_23.raw = ["", "", "", ""], someGenerics9(_a_23, '', 0, []));
 var a9a;
-var a9e = (_z = ["", "", "", ""], _z.raw = ["", "", "", ""], someGenerics9(_z, undefined, { x: 6, z: new Date() }, { x: 6, y: '' }));
+var a9e = (_a_24 = ["", "", "", ""], _a_24.raw = ["", "", "", ""], someGenerics9(_a_24, undefined, { x: 6, z: new Date() }, { x: 6, y: '' }));
 var a9e;
 // Generic tag with multiple parameters of generic type passed arguments with a single best common type
-var a9d = (_0 = ["", "", "", ""], _0.raw = ["", "", "", ""], someGenerics9(_0, { x: 3 }, { x: 6 }, { x: 6 }));
+var a9d = (_a_25 = ["", "", "", ""], _a_25.raw = ["", "", "", ""], someGenerics9(_a_25, { x: 3 }, { x: 6 }, { x: 6 }));
 var a9d;
 // Generic tag with multiple parameters of generic type where one argument is of type 'any'
 var anyVar;
-var a = (_1 = ["", "", "", ""], _1.raw = ["", "", "", ""], someGenerics9(_1, 7, anyVar, 4));
+var a = (_a_26 = ["", "", "", ""], _a_26.raw = ["", "", "", ""], someGenerics9(_a_26, 7, anyVar, 4));
 var a;
 // Generic tag with multiple parameters of generic type where one argument is [] and the other is not 'any'
-var arr = (_2 = ["", "", "", ""], _2.raw = ["", "", "", ""], someGenerics9(_2, [], null, undefined));
+var arr = (_a_27 = ["", "", "", ""], _a_27.raw = ["", "", "", ""], someGenerics9(_a_27, [], null, undefined));
 var arr;
-var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k, _l, _m, _n, _o, _p, _q, _r, _s, _t, _u, _v, _w, _x, _y, _z, _0, _1, _2;
+var _a, _a_1, _a_2, _a_3, _a_4, _a_5, _a_6, _a_7, _a_8, _a_9, _a_10, _a_11, _a_12, _a_13, _a_14, _a_15, _a_16, _a_17, _a_18, _a_19, _a_20, _a_21, _a_22, _a_23, _a_24, _a_25, _a_26, _a_27;
diff --git a/tests/baselines/reference/taggedTemplateStringsWithIncompatibleTypedTags.js b/tests/baselines/reference/taggedTemplateStringsWithIncompatibleTypedTags.js
index 9d11379322..972e0cfcf6 100644
--- a/tests/baselines/reference/taggedTemplateStringsWithIncompatibleTypedTags.js
+++ b/tests/baselines/reference/taggedTemplateStringsWithIncompatibleTypedTags.js
@@ -36,14 +36,14 @@ f.thisIsNotATag(`abc${1}def${2}ghi`);
 //// [taggedTemplateStringsWithIncompatibleTypedTags.js]
 var f;
 (_a = ["abc"], _a.raw = ["abc"], f(_a));
-(_b = ["abc", "def", "ghi"], _b.raw = ["abc", "def", "ghi"], f(_b, 1, 2));
-(_c = ["abc"], _c.raw = ["abc"], f(_c)).member;
-(_d = ["abc", "def", "ghi"], _d.raw = ["abc", "def", "ghi"], f(_d, 1, 2)).member;
-(_e = ["abc"], _e.raw = ["abc"], f(_e))["member"];
-(_f = ["abc", "def", "ghi"], _f.raw = ["abc", "def", "ghi"], f(_f, 1, 2))["member"];
-(_g = ["abc", "def", "ghi"], _g.raw = ["abc", "def", "ghi"], (_h = ["abc"], _h.raw = ["abc"], f(_h))[0].member(_g, 1, 2));
-(_j = ["abc", "def", "ghi"], _j.raw = ["abc", "def", "ghi"], (_k = ["abc", "def", "ghi"], _k.raw = ["abc", "def", "ghi"], f(_k, 1, 2))["member"].member(_j, 1, 2));
-(_l = ["abc", "def", "ghi"], _l.raw = ["abc", "def", "ghi"], (_m = ["abc", "def", "ghi"], _m.raw = ["abc", "def", "ghi"], f(_m, true, true))["member"].member(_l, 1, 2));
+(_a_1 = ["abc", "def", "ghi"], _a_1.raw = ["abc", "def", "ghi"], f(_a_1, 1, 2));
+(_a_2 = ["abc"], _a_2.raw = ["abc"], f(_a_2)).member;
+(_a_3 = ["abc", "def", "ghi"], _a_3.raw = ["abc", "def", "ghi"], f(_a_3, 1, 2)).member;
+(_a_4 = ["abc"], _a_4.raw = ["abc"], f(_a_4))["member"];
+(_a_5 = ["abc", "def", "ghi"], _a_5.raw = ["abc", "def", "ghi"], f(_a_5, 1, 2))["member"];
+(_a_6 = ["abc", "def", "ghi"], _a_6.raw = ["abc", "def", "ghi"], (_a_7 = ["abc"], _a_7.raw = ["abc"], f(_a_7))[0].member(_a_6, 1, 2));
+(_a_8 = ["abc", "def", "ghi"], _a_8.raw = ["abc", "def", "ghi"], (_a_9 = ["abc", "def", "ghi"], _a_9.raw = ["abc", "def", "ghi"], f(_a_9, 1, 2))["member"].member(_a_8, 1, 2));
+(_a_10 = ["abc", "def", "ghi"], _a_10.raw = ["abc", "def", "ghi"], (_a_11 = ["abc", "def", "ghi"], _a_11.raw = ["abc", "def", "ghi"], f(_a_11, true, true))["member"].member(_a_10, 1, 2));
 f.thisIsNotATag("abc");
 f.thisIsNotATag("abc" + 1 + "def" + 2 + "ghi");
-var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k, _l, _m;
+var _a, _a_1, _a_2, _a_3, _a_4, _a_5, _a_6, _a_7, _a_8, _a_9, _a_10, _a_11;
diff --git a/tests/baselines/reference/taggedTemplateStringsWithOverloadResolution1.js b/tests/baselines/reference/taggedTemplateStringsWithOverloadResolution1.js
index 431447df22..cb5df24cb7 100644
--- a/tests/baselines/reference/taggedTemplateStringsWithOverloadResolution1.js
+++ b/tests/baselines/reference/taggedTemplateStringsWithOverloadResolution1.js
@@ -37,9 +37,9 @@ var d = foo([], 1, true); // boolean (with error)
 var e = foo([], 1, "2"); // {}
 var f = foo([], 1, 2, 3); // any (with error)
 var u = (_a = [""], _a.raw = [""], foo(_a)); // number
-var v = (_b = ["", ""], _b.raw = ["", ""], foo(_b, 1)); // string
-var w = (_c = ["", "", ""], _c.raw = ["", "", ""], foo(_c, 1, 2)); // boolean
-var x = (_d = ["", "", ""], _d.raw = ["", "", ""], foo(_d, 1, true)); // boolean (with error)
-var y = (_e = ["", "", ""], _e.raw = ["", "", ""], foo(_e, 1, "2")); // {}
-var z = (_f = ["", "", "", ""], _f.raw = ["", "", "", ""], foo(_f, 1, 2, 3)); // any (with error)
-var _a, _b, _c, _d, _e, _f;
+var v = (_a_1 = ["", ""], _a_1.raw = ["", ""], foo(_a_1, 1)); // string
+var w = (_a_2 = ["", "", ""], _a_2.raw = ["", "", ""], foo(_a_2, 1, 2)); // boolean
+var x = (_a_3 = ["", "", ""], _a_3.raw = ["", "", ""], foo(_a_3, 1, true)); // boolean (with error)
+var y = (_a_4 = ["", "", ""], _a_4.raw = ["", "", ""], foo(_a_4, 1, "2")); // {}
+var z = (_a_5 = ["", "", "", ""], _a_5.raw = ["", "", "", ""], foo(_a_5, 1, 2, 3)); // any (with error)
+var _a, _a_1, _a_2, _a_3, _a_4, _a_5;
diff --git a/tests/baselines/reference/taggedTemplateStringsWithOverloadResolution2.js b/tests/baselines/reference/taggedTemplateStringsWithOverloadResolution2.js
index f12008f958..f17e1bbd2e 100644
--- a/tests/baselines/reference/taggedTemplateStringsWithOverloadResolution2.js
+++ b/tests/baselines/reference/taggedTemplateStringsWithOverloadResolution2.js
@@ -35,6 +35,6 @@ function foo2() {
     }
     return undefined;
 }
-var c = (_b = ["", ""], _b.raw = ["", ""], foo2(_b, 1)); // number
+var c = (_a_1 = ["", ""], _a_1.raw = ["", ""], foo2(_a_1, 1)); // number
 var d = foo2([], 1); // number
-var _a, _b;
+var _a, _a_1;
diff --git a/tests/baselines/reference/taggedTemplateStringsWithOverloadResolution3.js b/tests/baselines/reference/taggedTemplateStringsWithOverloadResolution3.js
index 4b9df44d3f..2176c43304 100644
--- a/tests/baselines/reference/taggedTemplateStringsWithOverloadResolution3.js
+++ b/tests/baselines/reference/taggedTemplateStringsWithOverloadResolution3.js
@@ -77,39 +77,39 @@ fn5 `${ (n) => n.substr(0) }`;
 function fn1() { return null; }
 var s = (_a = ["", ""], _a.raw = ["", ""], fn1(_a, undefined));
 // No candidate overloads found
-(_b = ["", ""], _b.raw = ["", ""], fn1(_b, {})); // Error
+(_a_1 = ["", ""], _a_1.raw = ["", ""], fn1(_a_1, {})); // Error
 function fn2() { return undefined; }
-var d1 = (_c = ["", "", ""], _c.raw = ["", "", ""], fn2(_c, 0, undefined)); // contextually typed
-var d2 = (_d = ["", "", ""], _d.raw = ["", "", ""], fn2(_d, 0, undefined)); // any
+var d1 = (_a_2 = ["", "", ""], _a_2.raw = ["", "", ""], fn2(_a_2, 0, undefined)); // contextually typed
+var d2 = (_a_3 = ["", "", ""], _a_3.raw = ["", "", ""], fn2(_a_3, 0, undefined)); // any
 d1.foo(); // error
 d2(); // no error (typed as any)
 // Generic and non-generic overload where generic overload is the only candidate
-(_e = ["", "", ""], _e.raw = ["", "", ""], fn2(_e, 0, '')); // OK
+(_a_4 = ["", "", ""], _a_4.raw = ["", "", ""], fn2(_a_4, 0, '')); // OK
 // Generic and non-generic overload where non-generic overload is the only candidate
-(_f = ["", "", ""], _f.raw = ["", "", ""], fn2(_f, '', 0)); // OK
+(_a_5 = ["", "", ""], _a_5.raw = ["", "", ""], fn2(_a_5, '', 0)); // OK
 function fn3() { return null; }
-var s = (_g = ["", ""], _g.raw = ["", ""], fn3(_g, 3));
-var s = (_h = ["", "", "", ""], _h.raw = ["", "", "", ""], fn3(_h, '', 3, ''));
-var n = (_j = ["", "", "", ""], _j.raw = ["", "", "", ""], fn3(_j, 5, 5, 5));
+var s = (_a_6 = ["", ""], _a_6.raw = ["", ""], fn3(_a_6, 3));
+var s = (_a_7 = ["", "", "", ""], _a_7.raw = ["", "", "", ""], fn3(_a_7, '', 3, ''));
+var n = (_a_8 = ["", "", "", ""], _a_8.raw = ["", "", "", ""], fn3(_a_8, 5, 5, 5));
 var n;
 // Generic overloads with differing arity tagging with arguments matching each overload type parameter count
-var s = (_k = ["", ""], _k.raw = ["", ""], fn3(_k, 4));
-var s = (_l = ["", "", "", ""], _l.raw = ["", "", "", ""], fn3(_l, '', '', ''));
-var n = (_m = ["", "", "", ""], _m.raw = ["", "", "", ""], fn3(_m, '', '', 3));
+var s = (_a_9 = ["", ""], _a_9.raw = ["", ""], fn3(_a_9, 4));
+var s = (_a_10 = ["", "", "", ""], _a_10.raw = ["", "", "", ""], fn3(_a_10, '', '', ''));
+var n = (_a_11 = ["", "", "", ""], _a_11.raw = ["", "", "", ""], fn3(_a_11, '', '', 3));
 // Generic overloads with differing arity tagging with argument count that doesn't match any overload
-(_n = [""], _n.raw = [""], fn3(_n)); // Error
+(_a_12 = [""], _a_12.raw = [""], fn3(_a_12)); // Error
 function fn4() { }
 // Generic overloads with constraints tagged with types that satisfy the constraints
-(_o = ["", "", ""], _o.raw = ["", "", ""], fn4(_o, '', 3));
-(_p = ["", "", ""], _p.raw = ["", "", ""], fn4(_p, 3, ''));
-(_q = ["", "", ""], _q.raw = ["", "", ""], fn4(_q, 3, undefined));
-(_r = ["", "", ""], _r.raw = ["", "", ""], fn4(_r, '', null));
+(_a_13 = ["", "", ""], _a_13.raw = ["", "", ""], fn4(_a_13, '', 3));
+(_a_14 = ["", "", ""], _a_14.raw = ["", "", ""], fn4(_a_14, 3, ''));
+(_a_15 = ["", "", ""], _a_15.raw = ["", "", ""], fn4(_a_15, 3, undefined));
+(_a_16 = ["", "", ""], _a_16.raw = ["", "", ""], fn4(_a_16, '', null));
 // Generic overloads with constraints called with type arguments that do not satisfy the constraints
-(_s = ["", "", ""], _s.raw = ["", "", ""], fn4(_s, null, null)); // Error
+(_a_17 = ["", "", ""], _a_17.raw = ["", "", ""], fn4(_a_17, null, null)); // Error
 // Generic overloads with constraints called without type arguments but with types that do not satisfy the constraints
-(_t = ["", "", ""], _t.raw = ["", "", ""], fn4(_t, true, null));
-(_u = ["", "", ""], _u.raw = ["", "", ""], fn4(_u, null, true));
+(_a_18 = ["", "", ""], _a_18.raw = ["", "", ""], fn4(_a_18, true, null));
+(_a_19 = ["", "", ""], _a_19.raw = ["", "", ""], fn4(_a_19, null, true));
 function fn5() { return undefined; }
-(_v = ["", ""], _v.raw = ["", ""], fn5(_v, function (n) { return n.toFixed(); })); // will error; 'n' should have type 'string'.
-(_w = ["", ""], _w.raw = ["", ""], fn5(_w, function (n) { return n.substr(0); }));
-var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k, _l, _m, _n, _o, _p, _q, _r, _s, _t, _u, _v, _w;
+(_a_20 = ["", ""], _a_20.raw = ["", ""], fn5(_a_20, function (n) { return n.toFixed(); })); // will error; 'n' should have type 'string'.
+(_a_21 = ["", ""], _a_21.raw = ["", ""], fn5(_a_21, function (n) { return n.substr(0); }));
+var _a, _a_1, _a_2, _a_3, _a_4, _a_5, _a_6, _a_7, _a_8, _a_9, _a_10, _a_11, _a_12, _a_13, _a_14, _a_15, _a_16, _a_17, _a_18, _a_19, _a_20, _a_21;
diff --git a/tests/baselines/reference/taggedTemplateStringsWithTagsTypedAsAny.js b/tests/baselines/reference/taggedTemplateStringsWithTagsTypedAsAny.js
index fd83d9d0ba..2bcbc173ab 100644
--- a/tests/baselines/reference/taggedTemplateStringsWithTagsTypedAsAny.js
+++ b/tests/baselines/reference/taggedTemplateStringsWithTagsTypedAsAny.js
@@ -28,15 +28,15 @@ f.thisIsNotATag(`abc${1}def${2}ghi`);
 //// [taggedTemplateStringsWithTagsTypedAsAny.js]
 var f;
 (_a = ["abc"], _a.raw = ["abc"], f(_a));
-(_b = ["abc", "def", "ghi"], _b.raw = ["abc", "def", "ghi"], f(_b, 1, 2));
-(_c = ["abc"], _c.raw = ["abc"], f.g.h(_c));
-(_d = ["abc", "def", "ghi"], _d.raw = ["abc", "def", "ghi"], f.g.h(_d, 1, 2));
-(_e = ["abc"], _e.raw = ["abc"], f(_e)).member;
-(_f = ["abc", "def", "ghi"], _f.raw = ["abc", "def", "ghi"], f(_f, 1, 2)).member;
-(_g = ["abc"], _g.raw = ["abc"], f(_g))["member"];
-(_h = ["abc", "def", "ghi"], _h.raw = ["abc", "def", "ghi"], f(_h, 1, 2))["member"];
-(_j = ["abc", "def", "ghi"], _j.raw = ["abc", "def", "ghi"], (_k = ["abc"], _k.raw = ["abc"], f(_k))["member"].someOtherTag(_j, 1, 2));
-(_l = ["abc", "def", "ghi"], _l.raw = ["abc", "def", "ghi"], (_m = ["abc", "def", "ghi"], _m.raw = ["abc", "def", "ghi"], f(_m, 1, 2))["member"].someOtherTag(_l, 1, 2));
+(_a_1 = ["abc", "def", "ghi"], _a_1.raw = ["abc", "def", "ghi"], f(_a_1, 1, 2));
+(_a_2 = ["abc"], _a_2.raw = ["abc"], f.g.h(_a_2));
+(_a_3 = ["abc", "def", "ghi"], _a_3.raw = ["abc", "def", "ghi"], f.g.h(_a_3, 1, 2));
+(_a_4 = ["abc"], _a_4.raw = ["abc"], f(_a_4)).member;
+(_a_5 = ["abc", "def", "ghi"], _a_5.raw = ["abc", "def", "ghi"], f(_a_5, 1, 2)).member;
+(_a_6 = ["abc"], _a_6.raw = ["abc"], f(_a_6))["member"];
+(_a_7 = ["abc", "def", "ghi"], _a_7.raw = ["abc", "def", "ghi"], f(_a_7, 1, 2))["member"];
+(_a_8 = ["abc", "def", "ghi"], _a_8.raw = ["abc", "def", "ghi"], (_a_9 = ["abc"], _a_9.raw = ["abc"], f(_a_9))["member"].someOtherTag(_a_8, 1, 2));
+(_a_10 = ["abc", "def", "ghi"], _a_10.raw = ["abc", "def", "ghi"], (_a_11 = ["abc", "def", "ghi"], _a_11.raw = ["abc", "def", "ghi"], f(_a_11, 1, 2))["member"].someOtherTag(_a_10, 1, 2));
 f.thisIsNotATag("abc");
 f.thisIsNotATag("abc" + 1 + "def" + 2 + "ghi");
-var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k, _l, _m;
+var _a, _a_1, _a_2, _a_3, _a_4, _a_5, _a_6, _a_7, _a_8, _a_9, _a_10, _a_11;
diff --git a/tests/baselines/reference/taggedTemplateStringsWithTypedTags.js b/tests/baselines/reference/taggedTemplateStringsWithTypedTags.js
index fcc2cda86d..16b14d32d9 100644
--- a/tests/baselines/reference/taggedTemplateStringsWithTypedTags.js
+++ b/tests/baselines/reference/taggedTemplateStringsWithTypedTags.js
@@ -34,13 +34,13 @@ f.thisIsNotATag(`abc${1}def${2}ghi`);
 //// [taggedTemplateStringsWithTypedTags.js]
 var f;
 (_a = ["abc"], _a.raw = ["abc"], f(_a));
-(_b = ["abc", "def", "ghi"], _b.raw = ["abc", "def", "ghi"], f(_b, 1, 2));
-(_c = ["abc"], _c.raw = ["abc"], f(_c)).member;
-(_d = ["abc", "def", "ghi"], _d.raw = ["abc", "def", "ghi"], f(_d, 1, 2)).member;
-(_e = ["abc"], _e.raw = ["abc"], f(_e))["member"];
-(_f = ["abc", "def", "ghi"], _f.raw = ["abc", "def", "ghi"], f(_f, 1, 2))["member"];
-(_g = ["abc", "def", "ghi"], _g.raw = ["abc", "def", "ghi"], (_h = ["abc"], _h.raw = ["abc"], f(_h))[0].member(_g, 1, 2));
-(_j = ["abc", "def", "ghi"], _j.raw = ["abc", "def", "ghi"], (_k = ["abc", "def", "ghi"], _k.raw = ["abc", "def", "ghi"], f(_k, 1, 2))["member"].member(_j, 1, 2));
+(_a_1 = ["abc", "def", "ghi"], _a_1.raw = ["abc", "def", "ghi"], f(_a_1, 1, 2));
+(_a_2 = ["abc"], _a_2.raw = ["abc"], f(_a_2)).member;
+(_a_3 = ["abc", "def", "ghi"], _a_3.raw = ["abc", "def", "ghi"], f(_a_3, 1, 2)).member;
+(_a_4 = ["abc"], _a_4.raw = ["abc"], f(_a_4))["member"];
+(_a_5 = ["abc", "def", "ghi"], _a_5.raw = ["abc", "def", "ghi"], f(_a_5, 1, 2))["member"];
+(_a_6 = ["abc", "def", "ghi"], _a_6.raw = ["abc", "def", "ghi"], (_a_7 = ["abc"], _a_7.raw = ["abc"], f(_a_7))[0].member(_a_6, 1, 2));
+(_a_8 = ["abc", "def", "ghi"], _a_8.raw = ["abc", "def", "ghi"], (_a_9 = ["abc", "def", "ghi"], _a_9.raw = ["abc", "def", "ghi"], f(_a_9, 1, 2))["member"].member(_a_8, 1, 2));
 f.thisIsNotATag("abc");
 f.thisIsNotATag("abc" + 1 + "def" + 2 + "ghi");
-var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k;
+var _a, _a_1, _a_2, _a_3, _a_4, _a_5, _a_6, _a_7, _a_8, _a_9;
diff --git a/tests/baselines/reference/templateStringInModuleName.js b/tests/baselines/reference/templateStringInModuleName.js
index 36f619176e..9ebb92a380 100644
--- a/tests/baselines/reference/templateStringInModuleName.js
+++ b/tests/baselines/reference/templateStringInModuleName.js
@@ -11,7 +11,7 @@ declare;
 {
 }
 declare;
-(_b = ["M", ""], _b.raw = ["M", ""], module(_b, 2));
+(_a_1 = ["M", ""], _a_1.raw = ["M", ""], module(_a_1, 2));
 {
 }
-var _a, _b;
+var _a, _a_1;