{"ast_node_type":"other","tokens":[{"end":39,"kind":"keyword","start":0,"text":"//!"}]}
//!   while `T: Sized`; *fptr-ptr-cast*
//! * `e` is a function pointer type and `U` has type `*T`,
//! * `e` is a function pointer type and `U` is an integer; *fptr-addr-cast*