My clang now doesn't complain about !"foo".

tests/AAClipTest.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Test.h"
 #include "SkAAClip.h"
 #include "SkCanvas.h"
@@ skipping 21 matching lines @@
         case SkMask::k3D_Format:
             break;
         case SkMask::kLCD16_Format:
             wbytes <<= 1;
             break;
         case SkMask::kLCD32_Format:
         case SkMask::kARGB32_Format:
             wbytes <<= 2;
             break;
         default:
-            SkASSERT(!"unknown mask format");
+            SkDEBUGFAIL("unknown mask format");
             return false;
     }
 
     const int h = a.fBounds.height();
     const char* aptr = (const char*)a.fImage;
     const char* bptr = (const char*)b.fImage;
     for (int y = 0; y < h; ++y) {
         if (memcmp(aptr, bptr, wbytes)) {
             return false;
         }
@@ skipping 346 matching lines @@
     test_path_bounds(reporter);
     test_irect(reporter);
     test_rgn(reporter);
     test_path_with_hole(reporter);
     test_regressions();
     test_nearly_integral(reporter);
 }
 
 #include "TestClassDef.h"
 DEFINE_TESTCLASS("AAClip", AAClipTestClass, TestAAClip)