Index: clang/lib/Format/UnwrappedLineParser.cpp
===================================================================
--- clang/lib/Format/UnwrappedLineParser.cpp
+++ clang/lib/Format/UnwrappedLineParser.cpp
@@ -1029,6 +1029,10 @@
     addUnwrappedLine();
     return;
   }
+  if (FormatTok->is(TT_StatementMacro)) {
+    parseCaseLabel();
+    return;
+  }
   switch (FormatTok->Tok.getKind()) {
   case tok::kw_asm:
     nextToken();
@@ -2243,7 +2247,8 @@
 }
 
 void UnwrappedLineParser::parseCaseLabel() {
-  assert(FormatTok->Tok.is(tok::kw_case) && "'case' expected");
+  assert((FormatTok->Tok.is(tok::kw_case) && "'case' expected") ||
+         FormatTok->is(TT_StatementMacro));
   // FIXME: fix handling of complex expressions here.
   do {
     nextToken();