syntax_data: {"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"Ok(ty::ImplSubject::Trait(trait_ref))"}]}
source_snippet:                 Ok(ty::ImplSubject::Trait(trait_ref))
context_before:                 let trait_ref = ty::TraitRef::relate(relation, trait_ref_a, trait_ref_b)?;
context_after:             }