Memory leaks in managed C structs with nested pointers

Vala's managed keyword is designed to automate the reclamation of C-allocated memory by attaching destructors to pointers. While this functions reliably for GObject-based types, complexity arises when handling standard C structs that contain nested pointers to other allocated memory blocks.

When a C struct is marked as managed in Vala, the compiler generates C code to free the top-level structure. However, if the structure contains internal pointers that require individual deallocation, the default-generated wrappers may not automatically traverse and free these nested members unless a specific destructor is explicitly mapped in the VAPI or header definition.

How does Vala handle the recursive deallocation of nested pointers within a managed struct to prevent memory leaks? Is there a specific syntax in the VAPI definition to ensure a custom destructor is called for all members of a managed struct?