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None of CDT's current navigation mechanisms allow you to navigate to the forward declaration of a class template from its definition or a use. Default arguments for template parameters are often specified only at the forward declaration, so it's useful to be able to navigate to it.
It looks like not navigating from a class definition to a class forward declaration, was a deliberate choice. However, for class template it's useful (due to default arguments, as mentioned), so I believe we should allow it.
New Gerrit change created: https://git.eclipse.org/r/86686
Gerrit change https://git.eclipse.org/r/86686 was merged to [master]. Commit: http://git.eclipse.org/c/cdt/org.eclipse.cdt.git/commit/?id=cee87b17578fe00e54fdb6a620447a6721871b13
Fixed for 9.3.
Mentioned in the 9.3 N&N: https://wiki.eclipse.org/CDT/User/NewIn93#Navigation_to_forward_declaration_of_class_template