syntax_data: {"ast_node_type":"other","tokens":[{"end":22,"kind":"keyword","start":0,"text":"match"}]}
source_snippet:         match (a, b) {
context_before:     ) -> RelateResult<'tcx, ty::ImplSubject<'tcx>> {
context_after:             (ty::ImplSubject::Trait(trait_ref_a), ty::ImplSubject::Trait(trait_ref_b)) => {