syntax_data: {"ast_node_type":"other","tokens":[{"end":44,"kind":"keyword","start":0,"text":"pub(crate)"}]}
source_snippet:     pub(crate) covered_by_one: Option<Span>,
context_before:     #[label(mir_build_unreachable_covered_by_one)]
context_after:     #[note(mir_build_unreachable_covered_by_many)]