Index: clang/lib/Format/FormatToken.h
===================================================================
--- clang/lib/Format/FormatToken.h
+++ clang/lib/Format/FormatToken.h
@@ -508,7 +508,7 @@
       return true;
     return is(TT_ArrayInitializerLSquare) || is(TT_ProtoExtensionLSquare) ||
            (is(tok::l_brace) &&
-            (BlockKind == BK_Block || is(TT_DictLiteral) ||
+            (BlockKind == BK_Block || BlockKind == BK_Unknown || is(TT_DictLiteral) ||
              (!Style.Cpp11BracedListStyle && NestingLevel == 0))) ||
            (is(tok::less) && (Style.Language == FormatStyle::LK_Proto ||
                               Style.Language == FormatStyle::LK_TextProto));