{"ast_node_type":"function","tokens":[{"end":54,"kind":"keyword","start":0,"text":"fn"}]}
    fn as_raw_ptr(&self) -> Option<(&Ty, Mutability)>;
    fn as_reference(&self) -> Option<(&Ty, Lifetime, Mutability)>;
    fn as_reference_or_ptr(&self) -> Option<(&Ty, Rawness, Mutability)>;