syntax_data: {"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// * the [otherwise block] of the third pattern to a block with an
context_before:     /// * the [otherwise block] of the first pattern to the second pattern,
context_after:     ///   [`Unreachable` terminator](TerminatorKind::Unreachable).