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

src/doc/SkDocument.cpp

Index: src/doc/SkDocument.cpp
diff --git a/src/doc/SkDocument.cpp b/src/doc/SkDocument.cpp
index e94c89bbeb7aab627a7eb9d798d69ec1640b3e8f..055c749792bb29c4de263c8e55f96d80b4ee08ab 100644
--- a/src/doc/SkDocument.cpp
+++ b/src/doc/SkDocument.cpp
@@ -49,7 +49,7 @@ SkCanvas* SkDocument::beginPage(SkScalar width, SkScalar height,
                 return NULL;
         }
     }
-    SkASSERT(!"never get here");
+    SkDEBUGFAIL("never get here");
     return NULL;
 }