syntax_data: {"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"debug_assert_matches!(tcx.def_kind(def_id),"}]}
source_snippet:     debug_assert_matches!(tcx.def_kind(def_id), DefKind::Fn | DefKind::AssocFn);
context_before:     let def_id = instance.def_id();