{"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"//!"}]}
//! expression, `e as U2` is not necessarily so (in fact it will only be valid if
//! Casting is not transitive, that is, even if `e as U1 as U2` is a valid
//! `U1` coerces to `U2`).