{"ast_node_type":"variable","tokens":[{"end":87,"kind":"keyword","start":0,"text":"let"}]}
    let trait_ref = Binders::new(binders, ctx.lower_trait_ref(target_trait, self_ty)?);
    let target_trait = impl_data.target_trait.as_ref()?;
    Some((trait_ref, create_diagnostics(ctx.diagnostics)))