diff -up v8-6.2.91/build/config/compiler/BUILD.gn.nolambda v8-6.2.91/build/config/compiler/BUILD.gn
--- v8-6.2.91/build/config/compiler/BUILD.gn.nolambda	2017-08-01 14:28:53.499913889 -0400
+++ v8-6.2.91/build/config/compiler/BUILD.gn	2017-08-01 14:29:03.242607676 -0400
@@ -1171,7 +1171,7 @@ config("default_warnings") {
         "-Wno-address-of-packed-member",
 
         # TODO(hans): https://crbug.com/681136
-        "-Wno-unused-lambda-capture",
+        # "-Wno-unused-lambda-capture",
 
         # TODO(thakis ): https://crbug.com/683349
         "-Wno-user-defined-warnings",