syntax_data: {"ast_node_type":"other","tokens":[{"end":18,"kind":"keyword","start":0,"text":"}"}]}
source_snippet:             } => {
context_before:                 match_data: box LoopMatchMatchData { box ref arms, span: match_span, scrutinee },
context_after:                 // Intuitively, this is a combination of a loop containing a labeled block