controller.h declares three handler pointers taking an akgl_Actor * and included nothing that declares that type, so any translation unit reaching for it before akgl/actor.h failed with "unknown type name 'akgl_Actor'". src/controller.c never noticed because it includes akgl/game.h first, and tests/controller.c carried a comment explaining the workaround. Included rather than forward-declared: akgl_Actor is a typedef of a named struct and repeating a typedef is C11, not C99. It closes no cycle -- actor.h reaches only types.h and character.h. tests/headers.c is a whole suite for one #include on purpose. A second #include after the first proves nothing about the second, because by then the first has dragged its dependencies in; covering another header means another file shaped like this one. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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