Index: docs/Modules.rst
===================================================================
--- docs/Modules.rst
+++ docs/Modules.rst
@@ -413,6 +413,9 @@
 blocks
   The "blocks" language feature is available.
 
+coroutines
+  Support for the coroutines TS is available.
+
 cplusplus
   C++ support is available.
 
Index: lib/Basic/Module.cpp
===================================================================
--- lib/Basic/Module.cpp
+++ lib/Basic/Module.cpp
@@ -64,6 +64,7 @@
   bool HasFeature = llvm::StringSwitch<bool>(Feature)
                         .Case("altivec", LangOpts.AltiVec)
                         .Case("blocks", LangOpts.Blocks)
+                        .Case("coroutines", LangOpts.CoroutinesTS)
                         .Case("cplusplus", LangOpts.CPlusPlus)
                         .Case("cplusplus11", LangOpts.CPlusPlus11)
                         .Case("freestanding", LangOpts.Freestanding)
Index: test/Modules/Inputs/DependsOnModule.framework/Headers/coroutines.h
===================================================================
--- /dev/null
+++ test/Modules/Inputs/DependsOnModule.framework/Headers/coroutines.h
@@ -0,0 +1,3 @@
+#ifndef __cpp_coroutines
+#error coroutines must be enabled
+#endif
Index: test/Modules/Inputs/DependsOnModule.framework/Headers/not_coroutines.h
===================================================================
--- /dev/null
+++ test/Modules/Inputs/DependsOnModule.framework/Headers/not_coroutines.h
@@ -0,0 +1,3 @@
+#ifdef __cpp_coroutines
+#error coroutines must NOT be enabled
+#endif
Index: test/Modules/Inputs/DependsOnModule.framework/module.map
===================================================================
--- test/Modules/Inputs/DependsOnModule.framework/module.map
+++ test/Modules/Inputs/DependsOnModule.framework/module.map
@@ -22,7 +22,14 @@
   explicit module CustomReq2 {
     requires custom_req2
   }
-
+  explicit module Coroutines {
+    requires coroutines
+    header "coroutines.h"
+  }
+  explicit module NotCoroutines {
+    requires !coroutines
+    header "not_coroutines.h"
+  }
   explicit framework module SubFramework {
     umbrella header "SubFramework.h"
 
Index: test/Modules/requires-coroutines.mm
===================================================================
--- /dev/null
+++ test/Modules/requires-coroutines.mm
@@ -0,0 +1,12 @@
+// RUN: rm -rf %t
+// RUN: %clang_cc1 -Wauto-import -fmodules-cache-path=%t -fmodules -fimplicit-module-maps -F %S/Inputs %s -verify
+// RUN: %clang_cc1 -Wauto-import -fmodules-cache-path=%t -fmodules -fimplicit-module-maps -F %S/Inputs %s -verify -fcoroutines-ts -DCOROUTINES
+
+
+#ifdef COROUTINES
+@import DependsOnModule.Coroutines;
+@import DependsOnModule.NotCoroutines; // expected-error {{module 'DependsOnModule.NotCoroutines' is incompatible with feature 'coroutines'}}
+#else
+@import DependsOnModule.NotCoroutines;
+@import DependsOnModule.Coroutines; // expected-error {{module 'DependsOnModule.Coroutines' requires feature 'coroutines'}}
+#endif