Merge branch 'master' of github.com:grpc/grpc into codegen_cleanse

src/objective-c/RxLibrary/transformations/GRXMappingWriter.m

@@ -33,10 +33,6 @@
 
 #import "GRXMappingWriter.h"
 
-static id (^kIdentity)(id value) = ^id(id value) {
-  return value;
-};
-
 @interface GRXForwardingWriter () <GRXWriteable>
 @end
 
@@ -51,7 +47,9 @@ static id (^kIdentity)(id value) = ^id(id value) {
 // Designated initializer
 - (instancetype)initWithWriter:(GRXWriter *)writer map:(id (^)(id value))map {
   if ((self = [super initWithWriter:writer])) {
-    _map = map ?: kIdentity;
+    _map = map ?: ^id(id value) {
+      return value;
+    };
   }
   return self;
 }