Warn on use of property dot syntax when unused.

llvm-svn: 78760

clang/lib/AST/Expr.cpp

@@ -540,7 +540,6 @@ bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1,
     return false;
   }
   case ObjCMessageExprClass:
-  case ObjCKVCRefExprClass:   // Dot syntax for message send.
     return false;
   case StmtExprClass: {
     // Statement exprs don't logically have side effects themselves, but are

clang/test/SemaObjC/unused.m

@@ -25,8 +25,7 @@ int test1(void) {
 @end
 
 void test2() {
-  // No unused warning: rdar://7126285
-  @"pointless example call for test purposes".length;
+  @"pointless example call for test purposes".length; // expected-warning {{expression result unused}}
 }