diff --git a/tests/baselines/reference/controlFlowIIFE.errors.txt b/tests/baselines/reference/controlFlowIIFE.errors.txt
index f8e82aff966..50053a90f2c 100644
--- a/tests/baselines/reference/controlFlowIIFE.errors.txt
+++ b/tests/baselines/reference/controlFlowIIFE.errors.txt
@@ -1,13 +1,8 @@
-error TS2318: Cannot find global type 'IterableIterator'.
-error TS2468: Cannot find global value 'Promise'.
 tests/cases/conformance/controlFlow/controlFlowIIFE.ts(64,5): error TS2454: Variable 'v' is used before being assigned.
-tests/cases/conformance/controlFlow/controlFlowIIFE.ts(69,6): error TS2705: An async function or method in ES5/ES3 requires the 'Promise' constructor.  Make sure you have a declaration for the 'Promise' constructor or include 'ES2015' in your `--lib` option.
 tests/cases/conformance/controlFlow/controlFlowIIFE.ts(72,5): error TS2454: Variable 'v' is used before being assigned.
 
 
-!!! error TS2318: Cannot find global type 'IterableIterator'.
-!!! error TS2468: Cannot find global value 'Promise'.
-==== tests/cases/conformance/controlFlow/controlFlowIIFE.ts (3 errors) ====
+==== tests/cases/conformance/controlFlow/controlFlowIIFE.ts (2 errors) ====
     declare function getStringOrNumber(): string | number;
     
     function f1() {
@@ -79,8 +74,6 @@ tests/cases/conformance/controlFlow/controlFlowIIFE.ts(72,5): error TS2454: Vari
     function f6() {
         let v: number;
         (async function() {
-         ~~~~~
-!!! error TS2705: An async function or method in ES5/ES3 requires the 'Promise' constructor.  Make sure you have a declaration for the 'Promise' constructor or include 'ES2015' in your `--lib` option.
             v = await 1;
         })();
         v; // still undefined
diff --git a/tests/baselines/reference/controlFlowIIFE.js b/tests/baselines/reference/controlFlowIIFE.js
index dfe536bcd2a..5c7fcb4bd52 100644
--- a/tests/baselines/reference/controlFlowIIFE.js
+++ b/tests/baselines/reference/controlFlowIIFE.js
@@ -74,66 +74,31 @@ function f6() {
 }
 
 //// [controlFlowIIFE.js]
-var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
-    return new (P || (P = Promise))(function (resolve, reject) {
-        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
-        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
-        function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments || [])).next());
-    });
-};
-var __generator = (this && this.__generator) || function (thisArg, body) {
-    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
-    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
-    function verb(n) { return function (v) { return step([n, v]); }; }
-    function step(op) {
-        if (f) throw new TypeError("Generator is already executing.");
-        while (_) try {
-            if (f = 1, y && (t = y[op[0] & 2 ? "return" : op[0] ? "throw" : "next"]) && !(t = t.call(y, op[1])).done) return t;
-            if (y = 0, t) op = [0, t.value];
-            switch (op[0]) {
-                case 0: case 1: t = op; break;
-                case 4: _.label++; return { value: op[1], done: false };
-                case 5: _.label++; y = op[1]; op = [0]; continue;
-                case 7: op = _.ops.pop(); _.trys.pop(); continue;
-                default:
-                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
-                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
-                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
-                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
-                    if (t[2]) _.ops.pop();
-                    _.trys.pop(); continue;
-            }
-            op = body.call(thisArg, _);
-        } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
-        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
-    }
-};
 function f1() {
-    var x = getStringOrNumber();
+    let x = getStringOrNumber();
     if (typeof x === "string") {
-        var n = function () {
+        let n = function () {
             return x.length;
         }();
     }
 }
 function f2() {
-    var x = getStringOrNumber();
+    let x = getStringOrNumber();
     if (typeof x === "string") {
-        var n = (function () {
+        let n = (function () {
             return x.length;
         })();
     }
 }
 function f3() {
-    var x = getStringOrNumber();
-    var y;
+    let x = getStringOrNumber();
+    let y;
     if (typeof x === "string") {
-        var n = (function (z) { return x.length + y + z; })(y = 1);
+        let n = (z => x.length + y + z)(y = 1);
     }
 }
 // Repros from #8381
-var maybeNumber;
+let maybeNumber;
 (function () {
     maybeNumber = 1;
 })();
@@ -141,49 +106,33 @@ maybeNumber++;
 if (maybeNumber !== undefined) {
     maybeNumber++;
 }
-var test;
+let test;
 if (!test) {
     throw new Error('Test is not defined');
 }
-(function () {
+(() => {
     test.slice(1); // No error
 })();
 // Repro from #23565
 function f4() {
-    var v;
+    let v;
     (function () {
         v = 1;
     })();
     v;
 }
 function f5() {
-    var v;
-    (function () {
-        return __generator(this, function (_a) {
-            switch (_a.label) {
-                case 0: return [4 /*yield*/, 1];
-                case 1:
-                    _a.sent();
-                    v = 1;
-                    return [2 /*return*/];
-            }
-        });
+    let v;
+    (function* () {
+        yield 1;
+        v = 1;
     })();
     v; // still undefined
 }
 function f6() {
-    var v;
-    (function () {
-        return __awaiter(this, void 0, void 0, function () {
-            return __generator(this, function (_a) {
-                switch (_a.label) {
-                    case 0: return [4 /*yield*/, 1];
-                    case 1:
-                        v = _a.sent();
-                        return [2 /*return*/];
-                }
-            });
-        });
+    let v;
+    (async function () {
+        v = await 1;
     })();
     v; // still undefined
 }
diff --git a/tests/baselines/reference/controlFlowIIFE.symbols b/tests/baselines/reference/controlFlowIIFE.symbols
index 619d945cca3..038d398c649 100644
--- a/tests/baselines/reference/controlFlowIIFE.symbols
+++ b/tests/baselines/reference/controlFlowIIFE.symbols
@@ -16,9 +16,9 @@ function f1() {
 >n : Symbol(n, Decl(controlFlowIIFE.ts, 5, 11))
 
             return x.length;
->x.length : Symbol(String.length, Decl(lib.d.ts, --, --))
+>x.length : Symbol(String.length, Decl(lib.es5.d.ts, --, --))
 >x : Symbol(x, Decl(controlFlowIIFE.ts, 3, 7))
->length : Symbol(String.length, Decl(lib.d.ts, --, --))
+>length : Symbol(String.length, Decl(lib.es5.d.ts, --, --))
 
         }();
     }
@@ -38,9 +38,9 @@ function f2() {
 >n : Symbol(n, Decl(controlFlowIIFE.ts, 14, 11))
 
             return x.length;
->x.length : Symbol(String.length, Decl(lib.d.ts, --, --))
+>x.length : Symbol(String.length, Decl(lib.es5.d.ts, --, --))
 >x : Symbol(x, Decl(controlFlowIIFE.ts, 12, 7))
->length : Symbol(String.length, Decl(lib.d.ts, --, --))
+>length : Symbol(String.length, Decl(lib.es5.d.ts, --, --))
 
         })();
     }
@@ -62,9 +62,9 @@ function f3() {
         let n = (z => x.length + y + z)(y = 1);
 >n : Symbol(n, Decl(controlFlowIIFE.ts, 24, 11))
 >z : Symbol(z, Decl(controlFlowIIFE.ts, 24, 17))
->x.length : Symbol(String.length, Decl(lib.d.ts, --, --))
+>x.length : Symbol(String.length, Decl(lib.es5.d.ts, --, --))
 >x : Symbol(x, Decl(controlFlowIIFE.ts, 21, 7))
->length : Symbol(String.length, Decl(lib.d.ts, --, --))
+>length : Symbol(String.length, Decl(lib.es5.d.ts, --, --))
 >y : Symbol(y, Decl(controlFlowIIFE.ts, 22, 7))
 >z : Symbol(z, Decl(controlFlowIIFE.ts, 24, 17))
 >y : Symbol(y, Decl(controlFlowIIFE.ts, 22, 7))
@@ -99,13 +99,13 @@ if (!test) {
 >test : Symbol(test, Decl(controlFlowIIFE.ts, 39, 3))
 
     throw new Error('Test is not defined');
->Error : Symbol(Error, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>Error : Symbol(Error, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
 }
 (() => {
     test.slice(1); // No error
->test.slice : Symbol(String.slice, Decl(lib.d.ts, --, --))
+>test.slice : Symbol(String.slice, Decl(lib.es5.d.ts, --, --))
 >test : Symbol(test, Decl(controlFlowIIFE.ts, 39, 3))
->slice : Symbol(String.slice, Decl(lib.d.ts, --, --))
+>slice : Symbol(String.slice, Decl(lib.es5.d.ts, --, --))
 
 })();
 
diff --git a/tests/baselines/reference/controlFlowIIFE.types b/tests/baselines/reference/controlFlowIIFE.types
index 9fde9b4f99f..7aaaad159fc 100644
--- a/tests/baselines/reference/controlFlowIIFE.types
+++ b/tests/baselines/reference/controlFlowIIFE.types
@@ -181,9 +181,9 @@ function f5() {
 >v : number
 
     (function*() {
->(function*() {        yield 1;        v = 1;    })() : {}
->(function*() {        yield 1;        v = 1;    }) : () => {}
->function*() {        yield 1;        v = 1;    } : () => {}
+>(function*() {        yield 1;        v = 1;    })() : IterableIterator<number>
+>(function*() {        yield 1;        v = 1;    }) : () => IterableIterator<number>
+>function*() {        yield 1;        v = 1;    } : () => IterableIterator<number>
 
         yield 1;
 >yield 1 : any
diff --git a/tests/cases/conformance/controlFlow/controlFlowIIFE.ts b/tests/cases/conformance/controlFlow/controlFlowIIFE.ts
index a3ee39d623e..8cd9047cb05 100644
--- a/tests/cases/conformance/controlFlow/controlFlowIIFE.ts
+++ b/tests/cases/conformance/controlFlow/controlFlowIIFE.ts
@@ -1,4 +1,5 @@
 // @strictNullChecks: true
+// @target: ES2017
 
 declare function getStringOrNumber(): string | number;