{"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"//"}]}
            // This is okay if they have the same metadata type.
        if let (Some(caller), Some(callee)) = (pointee_ty(caller.ty)?, pointee_ty(callee.ty)?) {
            let meta_ty = |ty: Ty<'tcx>| {