Index: lib/Format/TokenAnnotator.cpp
===================================================================
--- lib/Format/TokenAnnotator.cpp
+++ lib/Format/TokenAnnotator.cpp
@@ -462,13 +462,15 @@
           FormatToken *Previous = CurrentToken->getPreviousNonComment();
           if (Previous->is(TT_JsTypeOptionalQuestion))
             Previous = Previous->getPreviousNonComment();
-          if (((CurrentToken->is(tok::colon) &&
-                (!Contexts.back().ColonIsDictLiteral || !Style.isCpp())) ||
-               Style.Language == FormatStyle::LK_Proto ||
-               Style.Language == FormatStyle::LK_TextProto) &&
-              (Previous->Tok.getIdentifierInfo() ||
-               Previous->is(tok::string_literal)))
-            Previous->Type = TT_SelectorName;
+          if ((CurrentToken->is(tok::colon) &&
+               (!Contexts.back().ColonIsDictLiteral || !Style.isCpp())) ||
+              Style.Language == FormatStyle::LK_Proto ||
+              Style.Language == FormatStyle::LK_TextProto) {
+            Left->Type = TT_DictLiteral;
+            if (Previous->Tok.getIdentifierInfo() ||
+                Previous->is(tok::string_literal))
+              Previous->Type = TT_SelectorName;
+          }
           if (CurrentToken->is(tok::colon) ||
               Style.Language == FormatStyle::LK_JavaScript)
             Left->Type = TT_DictLiteral;
Index: unittests/Format/FormatTestTextProto.cpp
===================================================================
--- unittests/Format/FormatTestTextProto.cpp
+++ unittests/Format/FormatTestTextProto.cpp
@@ -289,6 +289,10 @@
                "  headheadheadheadheadhead_id: 1\n"
                "  product_data <product {1}>\n"
                ">");
+
+  verifyFormat("dcccwrnfioeruvginerurneitinfo {\n"
+               "  exte3nsionrnfvui {key: value}\n"
+               "}");
 }
 
 TEST_F(FormatTestTextProto, DiscardsUnbreakableTailIfCanBreakAfter) {