Index: lib/Sema/SemaLambda.cpp
===================================================================
--- lib/Sema/SemaLambda.cpp
+++ lib/Sema/SemaLambda.cpp
@@ -1491,6 +1491,7 @@
   bool ExplicitResultType;
   CleanupInfo LambdaCleanup;
   bool ContainsUnexpandedParameterPack;
+  bool IsGenericLambda;
   {
     CallOperator = LSI->CallOperator;
     Class = LSI->Lambda;
@@ -1499,7 +1500,8 @@
     ExplicitResultType = !LSI->HasImplicitReturnType;
     LambdaCleanup = LSI->Cleanup;
     ContainsUnexpandedParameterPack = LSI->ContainsUnexpandedParameterPack;
-    
+    IsGenericLambda = Class->isGenericLambda();
+
     CallOperator->setLexicalDeclContext(Class);
     Decl *TemplateOrNonTemplateCallOperatorDecl = 
         CallOperator->getDescribedFunctionTemplate()  
@@ -1519,8 +1521,10 @@
       bool IsImplicit = I >= LSI->NumExplicitCaptures;
 
       // Warn about unused explicit captures.
-      if (!CurContext->isDependentContext() && !IsImplicit && !From.isODRUsed())
-        DiagnoseUnusedLambdaCapture(From);
+      if (!CurContext->isDependentContext() && !IsImplicit)
+        if ((IsGenericLambda && !From.isNonODRUsed()) ||
+            (!IsGenericLambda && !From.isODRUsed()))
+          DiagnoseUnusedLambdaCapture(From);
 
       // Handle 'this' capture.
       if (From.isThisCapture()) {
@@ -1567,8 +1571,7 @@
     //   same parameter and return types as the closure type's function call
     //   operator.
     // FIXME: Fix generic lambda to block conversions.
-    if (getLangOpts().Blocks && getLangOpts().ObjC1 && 
-                                              !Class->isGenericLambda())
+    if (getLangOpts().Blocks && getLangOpts().ObjC1 && !IsGenericLambda)
       addBlockPointerConversion(*this, IntroducerRange, Class, CallOperator);
     
     // Finalize the lambda class.
Index: test/SemaCXX/warn-unused-lambda-capture.cpp
===================================================================
--- test/SemaCXX/warn-unused-lambda-capture.cpp
+++ test/SemaCXX/warn-unused-lambda-capture.cpp
@@ -161,6 +161,8 @@
   auto explicit_initialized_value_trivial_init = [j = Trivial()]{}; // expected-warning{{lambda capture 'j' is not used}}
   auto explicit_initialized_value_non_trivial_init = [j = Trivial(42)]{};
   auto explicit_initialized_value_with_side_effect = [j = side_effect()]{};
+  auto explicit_initialized_value_generic_used = [i = 1](auto c) mutable { i++; };
+  auto explicit_initialized_value_generic_unused = [i = 1](auto c) mutable {}; // expected-warning{{lambda capture 'i' is not used}}
 
   auto nested = [&i] {
     auto explicit_by_value_used = [i] { return i + 1; };