syntax_data: {"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // The first candidate has satisfied all its match pairs.
context_before:             [first, remaining @ ..] if first.match_pairs.is_empty() => {
context_after:                 // We record the blocks that will be needed by match arm lowering,