Suppose I have an opaque C type MyType and a C function get_name(MyType* p), and I'm going to invoke the function from Rust. Logically the function doesn't change the internal state of p, but the implementation may require a mutable pointer.
In this case, what should be signature of the corresponding function in Rust? More specifically, should I use p: *const MyType or p: *mut MyType?

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