{"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"//!"}]}
//! then a pre-order traversal of the HIR is consistent with the CFG RPO
//! we consider the reverse post-order (RPO) of the CFG implied by the HIR,
//! on the *initial CFG point* of each HIR node, while a post-order traversal