{"ast_node_type":"variable","tokens":[{"end":46,"kind":"keyword","start":0,"text":"let"}]}
        let dual = fd.core_convert_TryFrom()?;
    } else if fn_name == sym::try_into && fd.core_convert_TryInto() == Some(t) {
        let dual_f = dual.function(sema.db, &sym::try_from)?;