syntax_data: {"ast_node_type":"other","tokens":[{"end":27,"kind":"keyword","start":0,"text":"Ok(dst)"}]}
source_snippet:             Ok(dst) => dst,
context_before:         let dst = match Dfa::from_tree(dst) {
context_after:             Err(layout::Uninhabited) => return Answer::No(Reason::DstMayHaveSafetyInvariants),