syntax_data: {"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"match"}]}
source_snippet:                 match (tcx.impl_polarity(def_id), obligation.polarity()) {
context_before:             if let ImplCandidate(def_id) = candidate {
context_after:                     (ty::ImplPolarity::Reservation, _)