diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 903addec18285..110332b622440 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -11759,10 +11759,6 @@ namespace ts {
             checkSignatureDeclaration(node);
             let isAsync = isAsyncFunctionLike(node);
             if (isAsync) {
-                if (!compilerOptions.experimentalAsyncFunctions) {
-                    error(node, Diagnostics.Experimental_support_for_async_functions_is_a_feature_that_is_subject_to_change_in_a_future_release_Specify_experimentalAsyncFunctions_to_remove_this_warning);
-                }
-
                 emitAwaiter = true;
             }
 
diff --git a/src/compiler/commandLineParser.ts b/src/compiler/commandLineParser.ts
index 731a37a8cb79b..9a8c0ac416fb3 100644
--- a/src/compiler/commandLineParser.ts
+++ b/src/compiler/commandLineParser.ts
@@ -222,11 +222,6 @@ namespace ts {
             type: "boolean",
             description: Diagnostics.Watch_input_files,
         },
-        {
-            name: "experimentalAsyncFunctions",
-            type: "boolean",
-            description: Diagnostics.Enables_experimental_support_for_ES7_async_functions
-        },
         {
             name: "experimentalDecorators",
             type: "boolean",
diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
index b391545a73335..fda876fa36b6e 100644
--- a/src/compiler/diagnosticMessages.json
+++ b/src/compiler/diagnosticMessages.json
@@ -783,10 +783,6 @@
         "category": "Error",
         "code": 1245
     },
-    "Experimental support for async functions is a feature that is subject to change in a future release. Specify '--experimentalAsyncFunctions' to remove this warning.": {
-        "category": "Error",
-        "code": 1246
-    },
 
     "'with' statements are not allowed in an async function block.": {
         "category": "Error",
@@ -2282,10 +2278,6 @@
         "category": "Message",
         "code": 6066
     },
-    "Option 'experimentalAsyncFunctions' cannot be specified when targeting ES5 or lower.": {
-        "category": "Message",
-        "code": 6067
-    },
     "Enables experimental support for ES7 async functions.": {
         "category": "Message",
         "code": 6068
diff --git a/src/compiler/program.ts b/src/compiler/program.ts
index c6d3a245a8d97..abef5088fbbca 100644
--- a/src/compiler/program.ts
+++ b/src/compiler/program.ts
@@ -1076,11 +1076,6 @@ namespace ts {
                 !options.experimentalDecorators) {
                 programDiagnostics.add(createCompilerDiagnostic(Diagnostics.Option_0_cannot_be_specified_without_specifying_option_1, "emitDecoratorMetadata", "experimentalDecorators"));
             }
-
-            if (options.experimentalAsyncFunctions &&
-                options.target !== ScriptTarget.ES6) {
-                programDiagnostics.add(createCompilerDiagnostic(Diagnostics.Option_experimentalAsyncFunctions_cannot_be_specified_when_targeting_ES5_or_lower));
-            }
         }
     }
 }
diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index cbaa3e65e2774..2de545ce32f09 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -2080,7 +2080,6 @@ namespace ts {
         watch?: boolean;
         isolatedModules?: boolean;
         experimentalDecorators?: boolean;
-        experimentalAsyncFunctions?: boolean;
         emitDecoratorMetadata?: boolean;
         moduleResolution?: ModuleResolutionKind;
         /* @internal */ stripInternal?: boolean;
diff --git a/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction10_es6.ts b/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction10_es6.ts
index bb9f8a54e44a1..0959ed6c561e8 100644
--- a/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction10_es6.ts
+++ b/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction10_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 
 var foo = async foo(): Promise<void> => {
    // Legal to use 'await' in a type context.
diff --git a/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction1_es6.ts b/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction1_es6.ts
index 45e686fd280c3..83e7413c5279a 100644
--- a/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction1_es6.ts
+++ b/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction1_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 
 var foo = async (): Promise<void> => {
 };
\ No newline at end of file
diff --git a/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction2_es6.ts b/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction2_es6.ts
index 8d792fdff9c40..bf39735d4603f 100644
--- a/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction2_es6.ts
+++ b/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction2_es6.ts
@@ -1,5 +1,4 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 var f = (await) => {
 }
\ No newline at end of file
diff --git a/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction3_es6.ts b/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction3_es6.ts
index 9ca200f8d76f8..4ae27c596f1ab 100644
--- a/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction3_es6.ts
+++ b/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction3_es6.ts
@@ -1,5 +1,4 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 function f(await = await) {
 }
\ No newline at end of file
diff --git a/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction4_es6.ts b/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction4_es6.ts
index 4946592c45bb6..51b34abeca1aa 100644
--- a/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction4_es6.ts
+++ b/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction4_es6.ts
@@ -1,5 +1,4 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 var await = () => {
 }
\ No newline at end of file
diff --git a/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction5_es6.ts b/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction5_es6.ts
index 53052368b31a7..174a619bdf9f9 100644
--- a/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction5_es6.ts
+++ b/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction5_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 
 var foo = async (await): Promise<void> => {
 }
\ No newline at end of file
diff --git a/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction6_es6.ts b/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction6_es6.ts
index 69768429ecf1a..dace96c4933da 100644
--- a/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction6_es6.ts
+++ b/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction6_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 
 var foo = async (a = await): Promise<void> => {
 }
\ No newline at end of file
diff --git a/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction7_es6.ts b/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction7_es6.ts
index a034381ba57d2..b1fd5cc030d97 100644
--- a/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction7_es6.ts
+++ b/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction7_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 
 var bar = async (): Promise<void> => {
   // 'await' here is an identifier, and not an await expression.
diff --git a/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction8_es6.ts b/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction8_es6.ts
index 397e06f703dad..5d53338b1bd78 100644
--- a/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction8_es6.ts
+++ b/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction8_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 
 var foo = async (): Promise<void> => {
   var v = { [await]: foo }
diff --git a/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction9_es6.ts b/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction9_es6.ts
index 3f961c9d59592..da041fe472b30 100644
--- a/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction9_es6.ts
+++ b/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunction9_es6.ts
@@ -1,5 +1,4 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 var foo = async (a = await => await): Promise<void> => {
 }
\ No newline at end of file
diff --git a/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunctionCapturesArguments_es6.ts b/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunctionCapturesArguments_es6.ts
index f00d0d16545c5..8dab2c0408630 100644
--- a/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunctionCapturesArguments_es6.ts
+++ b/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunctionCapturesArguments_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 class C {
    method() {
       function other() {}
diff --git a/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunctionCapturesThis_es6.ts b/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunctionCapturesThis_es6.ts
index a90f08cb9f779..f2c507cbdd667 100644
--- a/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunctionCapturesThis_es6.ts
+++ b/tests/cases/conformance/async/es6/asyncArrowFunction/asyncArrowFunctionCapturesThis_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 class C {
    method() {
       var fn = async () => await this;      
diff --git a/tests/cases/conformance/async/es6/asyncAwaitIsolatedModules_es6.ts b/tests/cases/conformance/async/es6/asyncAwaitIsolatedModules_es6.ts
index 52694f241185d..8e2cfd8c6c578 100644
--- a/tests/cases/conformance/async/es6/asyncAwaitIsolatedModules_es6.ts
+++ b/tests/cases/conformance/async/es6/asyncAwaitIsolatedModules_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @isolatedModules: true
-// @experimentalAsyncFunctions: true
 import { MyPromise } from "missing";
 
 declare var p: Promise<number>;
diff --git a/tests/cases/conformance/async/es6/asyncAwait_es6.ts b/tests/cases/conformance/async/es6/asyncAwait_es6.ts
index eee2e73d023c9..8e72197a98d9a 100644
--- a/tests/cases/conformance/async/es6/asyncAwait_es6.ts
+++ b/tests/cases/conformance/async/es6/asyncAwait_es6.ts
@@ -1,5 +1,4 @@
 // @target: ES6
-// @experimentalAsyncFunctions: true
 type MyPromise<T> = Promise<T>;
 declare var MyPromise: typeof Promise;
 declare var p: Promise<number>;
diff --git a/tests/cases/conformance/async/es6/asyncClass_es6.ts b/tests/cases/conformance/async/es6/asyncClass_es6.ts
index c4a444ca90958..22ffe997b03cd 100644
--- a/tests/cases/conformance/async/es6/asyncClass_es6.ts
+++ b/tests/cases/conformance/async/es6/asyncClass_es6.ts
@@ -1,5 +1,4 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 async class C {  
 }
\ No newline at end of file
diff --git a/tests/cases/conformance/async/es6/asyncConstructor_es6.ts b/tests/cases/conformance/async/es6/asyncConstructor_es6.ts
index 998156f19f41f..d769fad039525 100644
--- a/tests/cases/conformance/async/es6/asyncConstructor_es6.ts
+++ b/tests/cases/conformance/async/es6/asyncConstructor_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 class C {  
   async constructor() {    
   }
diff --git a/tests/cases/conformance/async/es6/asyncDeclare_es6.ts b/tests/cases/conformance/async/es6/asyncDeclare_es6.ts
index d83c25a421a11..5e0fb536b395f 100644
--- a/tests/cases/conformance/async/es6/asyncDeclare_es6.ts
+++ b/tests/cases/conformance/async/es6/asyncDeclare_es6.ts
@@ -1,4 +1,3 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 declare async function foo(): Promise<void>;
\ No newline at end of file
diff --git a/tests/cases/conformance/async/es6/asyncEnum_es6.ts b/tests/cases/conformance/async/es6/asyncEnum_es6.ts
index d9569bef9d17e..4fad7923a8c93 100644
--- a/tests/cases/conformance/async/es6/asyncEnum_es6.ts
+++ b/tests/cases/conformance/async/es6/asyncEnum_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 async enum E {  
   Value
 }
\ No newline at end of file
diff --git a/tests/cases/conformance/async/es6/asyncGetter_es6.ts b/tests/cases/conformance/async/es6/asyncGetter_es6.ts
index fe5751ece0be7..79fde60fdc4bb 100644
--- a/tests/cases/conformance/async/es6/asyncGetter_es6.ts
+++ b/tests/cases/conformance/async/es6/asyncGetter_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 class C {
   async get foo() {
   }
diff --git a/tests/cases/conformance/async/es6/asyncInterface_es6.ts b/tests/cases/conformance/async/es6/asyncInterface_es6.ts
index c7bb460ea2b2c..5d5497d3cd4bf 100644
--- a/tests/cases/conformance/async/es6/asyncInterface_es6.ts
+++ b/tests/cases/conformance/async/es6/asyncInterface_es6.ts
@@ -1,5 +1,4 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 async interface I {  
 }
\ No newline at end of file
diff --git a/tests/cases/conformance/async/es6/asyncModule_es6.ts b/tests/cases/conformance/async/es6/asyncModule_es6.ts
index cf660d25d1f85..aa4c295d0e357 100644
--- a/tests/cases/conformance/async/es6/asyncModule_es6.ts
+++ b/tests/cases/conformance/async/es6/asyncModule_es6.ts
@@ -1,5 +1,4 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 async module M {   
 }
\ No newline at end of file
diff --git a/tests/cases/conformance/async/es6/asyncSetter_es6.ts b/tests/cases/conformance/async/es6/asyncSetter_es6.ts
index 2ca1c805a453e..8eedcbb5288a2 100644
--- a/tests/cases/conformance/async/es6/asyncSetter_es6.ts
+++ b/tests/cases/conformance/async/es6/asyncSetter_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 class C {
   async set foo(value) {
   }
diff --git a/tests/cases/conformance/async/es6/awaitBinaryExpression/awaitBinaryExpression1_es6.ts b/tests/cases/conformance/async/es6/awaitBinaryExpression/awaitBinaryExpression1_es6.ts
index df0d0e459d470..46060f309b241 100644
--- a/tests/cases/conformance/async/es6/awaitBinaryExpression/awaitBinaryExpression1_es6.ts
+++ b/tests/cases/conformance/async/es6/awaitBinaryExpression/awaitBinaryExpression1_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 declare var a: boolean;
 declare var p: Promise<boolean>;
 async function func(): Promise<void> {
diff --git a/tests/cases/conformance/async/es6/awaitBinaryExpression/awaitBinaryExpression2_es6.ts b/tests/cases/conformance/async/es6/awaitBinaryExpression/awaitBinaryExpression2_es6.ts
index 7678c4b17abc1..362f1ecc4463f 100644
--- a/tests/cases/conformance/async/es6/awaitBinaryExpression/awaitBinaryExpression2_es6.ts
+++ b/tests/cases/conformance/async/es6/awaitBinaryExpression/awaitBinaryExpression2_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 declare var a: boolean;
 declare var p: Promise<boolean>;
 async function func(): Promise<void> {
diff --git a/tests/cases/conformance/async/es6/awaitBinaryExpression/awaitBinaryExpression3_es6.ts b/tests/cases/conformance/async/es6/awaitBinaryExpression/awaitBinaryExpression3_es6.ts
index 0b441f063dded..d3b02033252e1 100644
--- a/tests/cases/conformance/async/es6/awaitBinaryExpression/awaitBinaryExpression3_es6.ts
+++ b/tests/cases/conformance/async/es6/awaitBinaryExpression/awaitBinaryExpression3_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 declare var a: number;
 declare var p: Promise<number>;
 async function func(): Promise<void> {
diff --git a/tests/cases/conformance/async/es6/awaitBinaryExpression/awaitBinaryExpression4_es6.ts b/tests/cases/conformance/async/es6/awaitBinaryExpression/awaitBinaryExpression4_es6.ts
index a0bdf58710fc0..eba3be31acfbc 100644
--- a/tests/cases/conformance/async/es6/awaitBinaryExpression/awaitBinaryExpression4_es6.ts
+++ b/tests/cases/conformance/async/es6/awaitBinaryExpression/awaitBinaryExpression4_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 declare var a: boolean;
 declare var p: Promise<boolean>;
 async function func(): Promise<void> {
diff --git a/tests/cases/conformance/async/es6/awaitBinaryExpression/awaitBinaryExpression5_es6.ts b/tests/cases/conformance/async/es6/awaitBinaryExpression/awaitBinaryExpression5_es6.ts
index 3276d24ee4bfa..71b173f9e73a7 100644
--- a/tests/cases/conformance/async/es6/awaitBinaryExpression/awaitBinaryExpression5_es6.ts
+++ b/tests/cases/conformance/async/es6/awaitBinaryExpression/awaitBinaryExpression5_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 declare var a: boolean;
 declare var p: Promise<boolean>;
 async function func(): Promise<void> {
diff --git a/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression1_es6.ts b/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression1_es6.ts
index 02de646112c57..d0442f0968dc4 100644
--- a/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression1_es6.ts
+++ b/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression1_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 declare var a: boolean;
 declare var p: Promise<boolean>;
 declare function fn(arg0: boolean, arg1: boolean, arg2: boolean): void;
diff --git a/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression2_es6.ts b/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression2_es6.ts
index 5d2e4046349ad..6de07ef12ffee 100644
--- a/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression2_es6.ts
+++ b/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression2_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 declare var a: boolean;
 declare var p: Promise<boolean>;
 declare function fn(arg0: boolean, arg1: boolean, arg2: boolean): void;
diff --git a/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression3_es6.ts b/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression3_es6.ts
index 702e1f4cbcc15..2cc0b7b12d071 100644
--- a/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression3_es6.ts
+++ b/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression3_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 declare var a: boolean;
 declare var p: Promise<boolean>;
 declare function fn(arg0: boolean, arg1: boolean, arg2: boolean): void;
diff --git a/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression4_es6.ts b/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression4_es6.ts
index aeeb192b4ba9a..8e349fbc5c329 100644
--- a/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression4_es6.ts
+++ b/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression4_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 declare var a: boolean;
 declare var p: Promise<boolean>;
 declare function fn(arg0: boolean, arg1: boolean, arg2: boolean): void;
diff --git a/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression5_es6.ts b/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression5_es6.ts
index 82bb1f88ad27b..bbe81ac94b110 100644
--- a/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression5_es6.ts
+++ b/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression5_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 declare var a: boolean;
 declare var p: Promise<boolean>;
 declare function fn(arg0: boolean, arg1: boolean, arg2: boolean): void;
diff --git a/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression6_es6.ts b/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression6_es6.ts
index d5778df71ba79..09e88f5acbcdd 100644
--- a/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression6_es6.ts
+++ b/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression6_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 declare var a: boolean;
 declare var p: Promise<boolean>;
 declare function fn(arg0: boolean, arg1: boolean, arg2: boolean): void;
diff --git a/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression7_es6.ts b/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression7_es6.ts
index db01f34c82531..fe0182da4aa1b 100644
--- a/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression7_es6.ts
+++ b/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression7_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 declare var a: boolean;
 declare var p: Promise<boolean>;
 declare function fn(arg0: boolean, arg1: boolean, arg2: boolean): void;
diff --git a/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression8_es6.ts b/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression8_es6.ts
index b0b10a02a6ff5..e3280eb7c10ff 100644
--- a/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression8_es6.ts
+++ b/tests/cases/conformance/async/es6/awaitCallExpression/awaitCallExpression8_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 declare var a: boolean;
 declare var p: Promise<boolean>;
 declare function fn(arg0: boolean, arg1: boolean, arg2: boolean): void;
diff --git a/tests/cases/conformance/async/es6/awaitUnion_es6.ts b/tests/cases/conformance/async/es6/awaitUnion_es6.ts
index 59c5285556c53..a132ae01dfde2 100644
--- a/tests/cases/conformance/async/es6/awaitUnion_es6.ts
+++ b/tests/cases/conformance/async/es6/awaitUnion_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 declare let a: number | string;
 declare let b: PromiseLike<number> | PromiseLike<string>;
 declare let c: PromiseLike<number | string>;
diff --git a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration10_es6.ts b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration10_es6.ts
index d543e424a38cc..aab1f0013ecf9 100644
--- a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration10_es6.ts
+++ b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration10_es6.ts
@@ -1,5 +1,4 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 async function foo(a = await => await): Promise<void> {
 }
\ No newline at end of file
diff --git a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration11_es6.ts b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration11_es6.ts
index 23e40a0e5ba8a..747d20d7ea850 100644
--- a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration11_es6.ts
+++ b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration11_es6.ts
@@ -1,5 +1,4 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 async function await(): Promise<void> {
 }
\ No newline at end of file
diff --git a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration12_es6.ts b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration12_es6.ts
index a457d27073f68..bbd7725036512 100644
--- a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration12_es6.ts
+++ b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration12_es6.ts
@@ -1,4 +1,3 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 var v = async function await(): Promise<void> { }
\ No newline at end of file
diff --git a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration13_es6.ts b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration13_es6.ts
index 83b6a99579cc5..8670fa0281165 100644
--- a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration13_es6.ts
+++ b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration13_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 async function foo(): Promise<void> {
    // Legal to use 'await' in a type context.
    var v: await;
diff --git a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration14_es6.ts b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration14_es6.ts
index b837e6618d1ec..ba70c61b49241 100644
--- a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration14_es6.ts
+++ b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration14_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 async function foo(): Promise<void> {
   return;
 }
\ No newline at end of file
diff --git a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration15_es6.ts b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration15_es6.ts
index 56bcf84911af7..74018b73678a9 100644
--- a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration15_es6.ts
+++ b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration15_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 declare class Thenable { then(): void; }
 declare let a: any;
 declare let obj: { then: string; };
diff --git a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration1_es6.ts b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration1_es6.ts
index 3a79214001105..289a65bb74fe1 100644
--- a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration1_es6.ts
+++ b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration1_es6.ts
@@ -1,5 +1,4 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 async function foo(): Promise<void> {
 }
\ No newline at end of file
diff --git a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration2_es6.ts b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration2_es6.ts
index e75ef1d36a3b0..25a153b4a3412 100644
--- a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration2_es6.ts
+++ b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration2_es6.ts
@@ -1,5 +1,4 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 function f(await) {
 }
\ No newline at end of file
diff --git a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration3_es6.ts b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration3_es6.ts
index 9ca200f8d76f8..4ae27c596f1ab 100644
--- a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration3_es6.ts
+++ b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration3_es6.ts
@@ -1,5 +1,4 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 function f(await = await) {
 }
\ No newline at end of file
diff --git a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration4_es6.ts b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration4_es6.ts
index ac4447a0e4d82..5d1ec389da366 100644
--- a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration4_es6.ts
+++ b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration4_es6.ts
@@ -1,5 +1,4 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 function await() {
 }
\ No newline at end of file
diff --git a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration5_es6.ts b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration5_es6.ts
index 60a0a8f4b7476..eb3cd1db55675 100644
--- a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration5_es6.ts
+++ b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration5_es6.ts
@@ -1,5 +1,4 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 async function foo(await): Promise<void> {
 }
\ No newline at end of file
diff --git a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration6_es6.ts b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration6_es6.ts
index a3ab64b9d294d..89b0445fd2efd 100644
--- a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration6_es6.ts
+++ b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration6_es6.ts
@@ -1,5 +1,4 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 async function foo(a = await): Promise<void> {
 }
\ No newline at end of file
diff --git a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration7_es6.ts b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration7_es6.ts
index cde12c7dbe3fb..5a964695da5e5 100644
--- a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration7_es6.ts
+++ b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration7_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 async function bar(): Promise<void> {
   // 'await' here is an identifier, and not a yield expression.
   async function foo(a = await): Promise<void> {
diff --git a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration8_es6.ts b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration8_es6.ts
index 52b6dba279279..764b0f3fb8a79 100644
--- a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration8_es6.ts
+++ b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration8_es6.ts
@@ -1,4 +1,3 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 var v = { [await]: foo }
\ No newline at end of file
diff --git a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration9_es6.ts b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration9_es6.ts
index 662fa01760655..7671764ad2add 100644
--- a/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration9_es6.ts
+++ b/tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration9_es6.ts
@@ -1,6 +1,5 @@
 // @target: ES6
 // @noEmitHelpers: true
-// @experimentalAsyncFunctions: true
 async function foo(): Promise<void> {
   var v = { [await]: foo }
 }
\ No newline at end of file