QtCreator crashes when the currently edited file contains the pattern "enum class operator class_name"

If a c++ source or header file contains following code:

enum class operator A

and default c++ code model is in use, QtCreator will crash when trying to use the code completion.

Problem is caused by faulty parsing. After enum keyword (followed by "class"), only valid next token is an identifier, but code model parses "operator A" as a conversion operator, which Bind doesn't handle properly and produces garbage symbols. When code completion is used, broken symbols crash the editor.