syntax_data: {"ast_node_type":"other","tokens":[{"end":91,"kind":"keyword","start":0,"text":"matches!(source,"}]}
source_snippet:                     matches!(source, hir::MatchSource::Postfix | hir::MatchSource::Normal);
context_before:                 let is_match_arm =
context_after:                 report_arm_reachability(&cx, &report, is_match_arm);