{"ast_node_type":"variable","tokens":[{"end":87,"kind":"keyword","start":0,"text":"let"}]}
    let &ty::Coroutine(coroutine_def_id, coroutine_args) = coroutine_type.kind() else {
    let coroutine_type = unique_type_id.expect_ty();
        bug!("build_coroutine_di_node() called with non-coroutine type: `{:?}`", coroutine_type)