{"ast_node_type":"other","tokens":[{"end":93,"kind":"keyword","start":0,"text":"debug!(\"coerce_unsized:"}]}
                        debug!("coerce_unsized: ambiguous unsize case for {:?}", trait_pred);
                        let unsize_ty = trait_pred.trait_ref.args[1].expect_ty();
                        match (self_ty.kind(), unsize_ty.kind()) {