syntax_data: {"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"ExprKind::Match"}]}
source_snippet:             ExprKind::Match { scrutinee, box ref arms, match_source } => {
context_before:             }
context_after:                 self.check_match(scrutinee, arms, match_source, ex.span);