syntax_data: {"ast_node_type":"other","tokens":[{"end":9,"kind":"keyword","start":0,"text":"}"}]}
source_snippet:         }
context_before:             return Err(TypeError::PolarityMismatch(ExpectedFound::new(a.polarity, b.polarity)));
context_after:         Ok(ty::TraitPredicate { trait_ref, polarity: a.polarity })