{"ast_node_type":"other","tokens":[{"end":93,"kind":"keyword","start":0,"text":"//"}]}
                    // `*mut [i32] -> *const [i32] -> *const i32` can skip the middle in MIR.
                    // things like `*mut [i32] -> *mut i32 -> *const i32` and
                    (PtrToPtr, PtrToPtr) => Some(PtrToPtr),