2026-02-18-unused-type-improvements.md

• RULE-2-3, A0-1-6 - UnusedTypeDeclarations.ql:
  • Type usage analysis has been improved to find more possible type usages, including:
    • Previous behavior considered anonymous types in variable declarations to be considered used by the variable definition itself. This has been improved to require that a field of the anonymous type is accessed for the type to be considered used.
    • Usages of a template type inside a specialization of that template are no longer considered usages of the template type.
    • Hidden friend declarations are no longer considered usages of the class they are declaring friendship for.
    • Improved exclusions generally, for cases such as nested types and functions within functions. These previously were a source of incorrectly identified type uses.
    • Additional case added to detect template <Enum = Enum::Value> as a usage of Enum, without an explicit tpl<Enum::Value> usage.