syntax_data: {"ast_node_type":"other","tokens":[{"end":91,"kind":"keyword","start":0,"text":"(ty::ImplSubject::Trait(trait_ref_a),"}]}
source_snippet:             (ty::ImplSubject::Trait(trait_ref_a), ty::ImplSubject::Trait(trait_ref_b)) => {
context_before:         match (a, b) {
context_after:                 let trait_ref = ty::TraitRef::relate(relation, trait_ref_a, trait_ref_b)?;