syntax_data: {"ast_node_type":"other","tokens":[{"end":94,"kind":"keyword","start":0,"text":"(Some(_),"}]}
source_snippet:                             (Some(_), None) => Some(Answer::No(Reason::DstIsBitIncompatible)),
context_before:                             // No matching transitions in `dst`. Fail.
context_after:                             // Matching transitions. Continue with successor states.